Jasminum grandiflorum : Influence of Flower Processing and Geographic Origin on Flower Absolute Composition

Abstract

Five Jasminum grandiflorum flower absolutes harvested as flower buds and processed in the “J. sambac-way” in different locations in the southern Indian state of Tamil Nadu were analyzed using gas chromatography (GC) and GC-mass spectrometry. These absolutes were compared with 5 commercial Indian J. grandiflorum flower absolutes manufactured in the traditional “J. grandiflorum-way” from open flowers. Focus was placed on 42 key ingredients to investigate the influence of such a flower processing on the absolute composition. Our study established olfactive and composition differences of such absolutes produced via the “J. sambac-way.” In addition, geographic variations in this species were analyzed by comparing 5 commercial Indian J. grandiflorum flower absolutes with absolutes from Egypt and Morocco, respectively. A composition range of the absolutes was established for the 3 main J. grandiflorum flower grower countries using a total of 14 commercial samples. The 12 main ingredients in the absolutes showed variations between 4.3% and 89.7%.

Keywords

oleaceae flower processing geographic origin: India Egypt and Morocco flower absolute composition odor

The introduction of synthetic aroma molecules in the middle of the 19th century^1
-3 has changed the perfumer’s palette from 100% natural ingredients before to approximately 5% naturals today. However, absolutes and essential oils still play a significant role in modern perfumery, especially in fine fragrances.^4,5 While the key natural ingredients in perfumery have not changed much in the last decades,⁴ the natural palette is still expanding. Today, the addition of really new naturals is more the exception than the norm due to increased regulatory and registration requirements and they are mainly used for the creation of prestigious fine fragrances. Instead, existing materials are processed using new extraction methods and solvents.^6,7 Currently, supercritical carbon dioxide (CO₂) extracts experienced a revival as the technology is becoming more affordable.⁸ Only very few debutants have gained at least some volume like Pink Pepper essential oil and the respective CO₂ extracts from the berries of the 2 Schinus species molle L.^9,10 and terebinthifolius Raddi,^11,12 respectively. Another example is the absolute of Jasminum sambac (L.) Ait.,¹³ which still remains the little brother^5,14
-16 of J. officinale L. subsp. grandiflorum (L.) E. Laguna,¹⁷ commonly known as J. grandiflorum L.^18
-20

It is worth to note that the flower processing of both jasmine species prior to concrete manufacturing is significantly different. The extraction processes leading to the concrete and consecutively to the respective absolute, however, are identical. These 2 different work streams for flower preparation have been established over the years due to different usage patterns of the 2 Jasminum species. This is mainly linked to the fact that the more robust and bigger flower buds of J. sambac are preferred in ornamental use over the much smaller and more delicate J. grandiflorum buds. The difference between the 2 species is very obvious from the kg/flower equivalent and also reflected in the price dependency of the flowers and subsequently the flower harvesting state. Only the remaining J. sambac buds, which are not sold on flower markets during the day for ornamental use, are purchased from raw material manufacturers, while J. grandiflorum flowers are picked from the farmers as fully blossomed out open flowers nearly exclusively for concrete production. Jasminum grandiflorum flowers are directly extracted (“J. grandiflorum-way”), while J. sambac buds awaiting their flourishing spread on a floor before they are extracted the same night (“J. sambac-way) as only fully blossomed out flowers are giving the maximum concrete yield. For a detailed comparison of the 2 Jasminum species: sambac and grandiflorum, see Table 1.

Table 1

Indian Jasminum sambac and J. grandiflorum—Fact Sheet.^a

	J. sambac	J. grandiflorum
Flower	Robust	Delicate
Flowers equal to 1 kg	5000-6000	11 000-12 000
Flowers (kg)/picker/day^b	5-6	2-3
Collected as	Buds	Open flowers/buds
Picking time start	Day break (6 am)	Day break (6 am); for buds (7 am)
Blooming start	Night (6-8 pm)	Night (6-8 pm)
Indian season	March-September	June-November
Peak season	April-June	End July-September
Flowers (%) used for absolute	5	95
Flower supply for extraction depending on	Ornamental use, price, and season	Mainly season
Flower price	Variable depending on time of day and supply	Constant depending on supply
Price peak	Early morning	None
Flowers (kg) needed for 1 kg concrete/absolute	850/1500	300/600
Concrete processing	Buds picked in early morning and stored until buds open (7-8 pm; extraction during night	Open flowers picked in early morning or during day; extraction during day
Main producer besides India	China	Egypt, Morocco

^aPersonal communication R. S. Palaniswamy (Jasmine C. E. Pvt. Ltd., India).

^bGood picker.

While the influence of CO₂ extraction on composition has been described in the literature,^21,22 to the best of our knowledge, no study has been carried out to establish the influence of a “J. sambac-way” flower treatment on J. grandiflorum absolute composition. To eliminate normal geographical variability, samples from different locations were used. Here, we report analyses of 5 J. grandiflorum flower absolutes all originating from different locations in the southern Indian state Tamil Nadu. These absolutes were processed in the traditional “J. sambac-way”, starting from flower buds, which were then spread out on the floor to blossom prior to extraction. These were compared with 5 commercially available J. grandiflorum absolutes from India, all processed in the traditional “J. grandiflorum-way.” In addition, geographic variations were investigated in J. grandiflorum by comparing the composition of commercial Indian flower absolutes with absolutes from Egypt and Morocco, respectively, to establish a country-specific composition range.

Results and Discussion

All J. grandiflorum absolutes were analyzed by gas chromatography (GC) and GC/mass spectrometry (MS). Constituents were identified by comparing their mass spectra with known compounds, published spectra, or the Symrise in-house library.²³ We focused our analyses on 42 constituents, covering major ingredients as well as compounds that help to distinguish between various Jasminum species including 2 epimeric methyl jasmonates.²⁴ Thirty-eight of these molecules were identified in a previous publication,²⁵ and 4 components were additionally added as they are monitored by other companies.²⁶ 2-Phenylethyl alcohol (retention index 1090), phenylacetaldehyde oxime (1250), 1(10),5-germacradien-4-ol (1561), (2E,6E)-farnesol (1698), (2E,6E)-farnesyl acetate (1817), and 2-phenylethyl salicylate (1915) were not detected in any J. grandiflorum absolute A-T and therefore not reported in Tables 2 and 3. Ethyl linoleate (2137) was only present in 3 commercial samples, 1 Indian J (<0.1%), and 2 Egyptian absolutes P/Q (0.2/0.1%), all obtained from French suppliers. The remaining 35 compounds represented between 78.7% (T) and 93.5% (F) of the GC-detectable fraction and on average 86.6% for the 20 absolutes.

Table 2

Comparison of 35 Constituents (Area %) of J. grandiflorum Flower Absolutes From India: Lab Trials A-E (“J. sambac-Way”), F-J (Commercial), Pilot Plant Trial K (“J. sambac-Way), and L (“J. grandiflorum-Way”).^a

No.	RI	Compound	A	B	C	D	E	F	G	H	I	J	K	L
1	986	(3Z)-Hexenyl acetate	-	-	-	<0.1	t	t	<0.1	t	t	<0.1	t	t
2	1011	Benzyl alcohol	0.6	1.1	0.8	1.3	1.0	0.4	1.2	1.1	2.8	1.0	1.1	0.8
3	1048	p-Cresol	1.2	1.6	0.8	1.2	1.5	0.7	1.2	0.4	0.8	0.6	4.8	1.9
4	1073	Methyl benzoate	<0.1	0.1	0.2	0.2	0.1	<0.1	<0.1	<0.1	<0.1	0.2	0.3	0.1
5	1085	Linalool	2.0	2.3	2.8	6.9	3.5	4.1	5.4	3.7	5.3	4.4	2.2	4.1
6	1092	Benzyl cyanide	-	-	-	<0.1	-	-	<0.1	<0.1	0.1	<0.1	t	<0.1
7	1134	Benzyl acetate	13.9	21.7	16.5	27.6	19.4	18.4	18.7	16.0	15.7	17.5	16.0	20.9
8	1173	Methyl salicylate	<0.1	<0.1	<0.1	0.1	0.1	<0.1	<0.1	<0.1	<0.1	<0.1	<0.1	<0.1
9	1254	Indole	2.7	4.6	2.3	2.8	4.3	2.9	2.0	2.0	0.3	1.1	4.9	2.8
10	1310	Methyl anthranilate	-	-	-	-	-	-	-	t	-	t	t	t
11	1328	Eugenol	1.0	1.7	0.6	1.0	1.3	1.8	1.2	1.6	3.0	1.9	2.1	1.9
12	1368	(Z)-Jasmone (1)	5.7	4.0	4.8	5.0	4.8	1.3	1.6	2.4	2.0	1.2	2.7	1.2
13	1443	δ-Jasmine lactone (2)	0.6	0.5	0.7	0.8	0.7	0.2	0.2	0.3	0.3	0.2	0.6	0.2
14	1483	(3Z,6E)-α-Farnesene	-	-	-	-	-	t	<0.1	<0.1	<0.1	<0.1	t	t
15	1496	(3E,6E)-α-Farnesene	1.3	1.7	1.9	1.6	1.5	0.8	1.2	1.2	0.9	0.9	2.4	0.8
16	1544	(3Z)-Hexenyl benzoate	1.0	1.2	1.2	1.5	1.1	0.7	0.9	1.0	1.0	0.7	0.6	0.7
17	1548	(E)-Nerolidol	<0.1	<0.1	0.2	<0.1	0.1	0.2	0.2	0.2	0.2	0.1	0.3	0.1
18	1605	(Z)-Methyl jasmonate (trans-3)	0.7	0.5	0.7	0.5	0.8	0.2	0.8	1.1	0.5	0.5	1.1	0.7
19	1634	(Z)-Methyl epi-jasmonate (cis-3)	0.3	<0.1	0.4	0.4	0.2	0.5	0.1	0.1	<0.1	0.1	0.2	0.3
20	1718	Benzyl benzoate	10.0	25.5	16.0	17.0	13.5	17.8	14.1	13.1	18.7	14.7	8.8	9.9
21	1817	Benzyl salicylate	0.1	<0.1	0.1	<0.1	0.2	0.1	0.1	0.1	0.2	0.1	0.2	0.1
22	1907	Methyl palmitate	1.4	1.1	1.5	1.0	1.3	1.8	1.8	1.5	1.4	1.6	1.2	1.5
23	1937	Isophytol	8.2	7.0	6.3	4.7	5.4	7.3	7.8	7.7	5.3	6.4	5.6	5.6
24	2014	Geranyllinalool	1.9	1.4	1.7	1.5	1.2	3.4	3.4	3.8	3.0	3.2	2.2	2.7
25	2072	Methyl linolate	0.2	<0.1	0.2	0.1	0.2	0.2	0.2	0.2	0.2	0.2	0.1	0.3
26	2074	Methyl linolenate	4.8	2.5	3.8	2.2	3.3	2.3	1.9	1.9	1.7	1.9	2.4	2.5
27	2078	Methyl oleate	0.3	0.1	0.1	0.2	<0.1	1.0	1.0	1.0	0.8	0.9	0.5	0.9
28	2096	(E)-Phytol	16.8	12.2	12.3	6.0	8.8	8.3	4.8	8.1	5.2	5.9	10.9	8.5
29	2109	Methyl stearate	<0.1	<0.1	0.1	<0.1	<0.1	0.2	1.0	0.4	0.4	0.8	0.3	0.3
30	2208	(E)-Phytyl acetate	3.0	3.1	4.5	2.9	3.5	5.9	3.9	6.8	6.5	6.3	3.9	4.7
31	2300	Tricosene	-	t	t	<0.1	0.2	-	t	-	0.2	-	t	<0.1
32	2552	Benzyl palmitate	t	t	0.1	0.1	0.1	<0.1	0.1	-	-	-	<0.1	<0.1
33	2688	Benzyl linolenate	-	t	<0.1	-	<0.1	-	0.2	-	-	0.3	<0.1	0.1
34	2792	Squalene	4.6	3.4	3.0	1.7	2.5	4.9	3.7	4.4	2.7	4.4	4.5	4.0
35	2911	2,3-Epoxy squalene^b	2.0	1.6	1.6	0.7	1.6	8.1	9.0	7.2	4.3	11.0	8.1	9.9

Abbreviations: RI, retention index; t, trace (≤0.01%).

^aMeasured on ZB-1 column.

^bCorrect isomer not determined; “-” indicates not detected.

Table 3

Comparison of 35 Constituents (Area %) of Commercial J. grandiflorum Flower Absolutes From Egypt M-Q and Morocco R-T.^a

No.	RI	Compound	M	N	O	P	Q	R	S	T
1	986	(3Z)-Hexenyl acetate	t	0.2	<0.1	t	<0.1	<0.1	<0.1	<0.1
2	1011	Benzyl alcohol	1.3	1.2	0.9	1.4	1.2	1.3	1.7	1.2
3	1048	p-Cresol	0.3	0.4	0.4	0.4	0.2	0.3	0.3	0.2
4	1073	Methyl benzoate	0.1	0.1	0.1	<0.1	<0.1	0.1	<0.1	<0.1
5	1085	Linalool	2.9	2.9	2.3	3.0	2.7	3.0	3.4	3.0
6	1092	Benzyl cyanide	<0.1	0.1	<0.1	<0.1	<0.1	<0.1	<0.1	<0.1
7	1134	Benzyl acetate	15.7	15.6	14.3	14.2	12.2	18.2	14.8	14.3
8	1173	Methyl salicylate	<0.1	<0.1	<0.1	<0.1	<0.1	<0.1	<0.1	<0.1
9	1254	Indole	1.2	2.1	2.2	1.6	1.0	1.9	1.6	1.2
10	1310	Methyl anthranilate	t	<0.1	t	t	t	t	<0.1	t
11	1328	Eugenol	2.0	1.8	2.0	1.6	0.9	2.0	2.2	1.9
12	1368	(Z)-Jasmone (1)	2.0	2.0	2.0	1.8	2.2	2.9	2.3	2.4
13	1443	δ-Jasmine lactone (2)	0.5	0.3	0.6	0.4	0.4	1.1	0.8	1.2
14	1483	(3Z,6E)-α-Farnesene	0.2	0.2	0.3	0.2	0.4	<0.1	<0.1	<0.1
15	1496	(3E,6E)-α-Farnesene	1.2	1.5	1.2	1.2	1.7	2.2	1.6	2
16	1544	(3Z)-Hexenyl benzoate	1.0	1.0	1.0	1.0	1.5	1.2	1.1	1.1
17	1548	(E)-Nerolidol	0.1	0.6	0.1	0.1	0.3	0.2	0.2	0.2
18	1605	(Z)-Methyl jasmonate (trans- 3)	0.9	0.9	1.0	0.9	1.1	1.5	1.3	1.2
19	1634	(Z)-Methyl epi-jasmonate (cis- 3)	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1
20	1718	Benzyl benzoate	10.0	9.0	9.5	8.8	8.5	9.8	12.0	9.7
21	1817	Benzyl salicylate	<0.1	0.1	0.1	<0.1	<0.1	<0.1	<0.1	<0.1
22	1907	Methyl palmitate	1.4	1.5	1.4	1.5	1.5	1.2	1.5	1.4
23	1937	Isophytol	6.5	5.7	6.3	6.3	7.9	6.0	5.7	5.0
24	2014	Geranyllinalool	3.1	2.8	3.0	2.9	3.6	3.6	4.0	3.2
25	2072	Methyl linolate	0.2	0.2	0.2	0.3	0.2	0.2	0.3	0.3
26	2074	Methyl linolenate	2.4	2.3	2.4	2.3	1.9	2.5	2.5	2.7
27	2078	Methyl oleate	0.8	0.8	0.8	0.8	0.8	0.7	0.8	0.8
28	2096	(E)-Phytol	9.4	7.9	10.6	8.6	9.0	10.6	6.9	6.0
29	2109	Methyl stearate	0.4	0.6	0.4	0.5	0.7	0.5	0.6	0.4
30	2208	(E)-Phytyl acetate	6.2	4.5	6.0	5.5	7.3	6.3	7.2	5.6
31	2300	Tricosene	t	1.2	0.9	0.2	<0.1	<0.1	<0.1	-
32	2552	Benzyl palmitate	-	-	-	0.2	0.3	-	-	0.2
33	2688	Benzyl linolenate	-	-	-	0.3	0.2	-	-	0.4
34	2792	Squalene	4.6	4.6	4.9	4.6	4.6	6.6	6.9	6.6
35	2911	2,3-Epoxy squalene^b	10.7	11.8	11.5	10.2	10.2	7.0	7.3	6.4

Abbreviations: RI, retention index; tr, trace (≤0.01%).

^aMeasured on ZB-1 column

^bCorrect isomer not determined; “-” indicates not detected.

In India, J. grandiflorum shrubs (family: Oleaceae) can be found in varying degrees throughout peninsular India and the Indo-Gangetic plains. The state of Tamil Nadu, located geographically in the central part of the southern extremity of the Indian peninsula, however, has by far the largest acreage under commercial J. grandiflorum cultivation in India.^14,15 Other Indian states with a significant jasmine crop area are Karnataka, Andhra Pradesh, West Bengal, Uttar Pradesh, and Rajasthan. In India, J. grandiflorum season normally lasts from June to November reaching its peak from the end of July to September (Table 1). Our first focus was placed on the comparison of 5 Indian J. grandiflorum flower absolutes A-E originating from the south Indian state Tamil Nadu with 5 commercial Indian absolutes F-J, which were produced from 4 different suppliers. Absolutes F and G were produced at the same time with flowers from the same region. While the commercial absolutes F-J were produced the standard way from open flowers, absolutes A-E were derived from buds harvested in the months of September and October approximately 24 hours before the open, flower would have been normally harvested (for details see Table 4 and Experimental section). Buds were spread out on the floor to blossom in a similar fashion used traditionally for J. sambac absolute production and extracted the same night. The number of single ingredients varied significantly in all 5 lab samples A-E (Table 2) produced via the “J. sambac-way.”

Table 4

Provenance (City/District/Geographic Coordinates), Harvest Time, and Processed Quantity (kg)] of J. grandiflorum Flowers A-E/K/L From Tamil Nadu, India.

Entry	City	District	CoordinatesN/E (°)	Harvest time	Quantity(kg)
A	Karamadei	Coimbatore	11.23/76.96	09/2010	30.3
B	Salem	Salem	11.66/78.15	09/2010	33.7
C	Thirupattur	Vellore	12.51/78.57	10/2010	29.9
D	Nilakottai	Dindigul	10.16/77.85	09/2010	31.7
E	Kodai Road	Dindigul	10.18/77.91	10/2010	31.4
K	Ayarpadi	Coimbatore	11.25/76.96	11/2012	35.8
L	Ayarpadi	Coimbatore	11.25/76.96	11/2012	41.3

Focusing only on major ingredients (>2.0%, marked bold in Tables 2 and 3), the 5 absolutes A-E showed significant variability for these 12 main compounds between 30% for (Z)-jasmone and 71% for linalool (see also Table 5). Absolute B contained significantly more benzyl benzoate compared with the other 4 A/C-F and higher amounts of indole similar to sample E. Sample D showed significantly higher amounts of linalool and benzyl acetate but lower amounts of isophytol, (E)-phytol, squalene, and 2,3-epoxy squalene compared with others (A-C/E/F). It is worth to mention the higher level of (Z)-methyl epi-jasmonate compared with (Z)-methyl jasmonate in absolute F as the equilibrium should favor the (Z)-methyl jasmonate²⁴ as seen in all other samples. We could rule out co-elution and reanalysis confirmed the finding.

Table 5

Variability (%)^a for 12 Main Ingredients (>2.0%) in J. grandiflorum Flower Absolutes From India A-E (“J. sambac-Way”), F-J (Commercial), Egypt M-Q, and Morocco R-T.

Compound	Variability (%)
Compound	A-E	F-J	M-Q	R-T
Linalool	71.0	31.5	23.3	11.8
Benzyl acetate	49.6	16.0	22.3	21.4
Indole	50.0	89.7	54.5	36.8
(Z)-Jasmone	29.8	50.0	18.2	20.7
Benzyl benzoate	60.8	29.9	15.0	19.2
Isophytol	42.7	32.1	27.8	16.7
Geranyllinalool	36.8	21.1	22.2	20.0
Methyl linolenate	54.2	26.1	12.0	7.4
(E)-Phytol	64.3	42.2	25.5	43.4
(E)-Phytyl acetate	35.6	42.6	38.4	22.2
Squalene	63.0	44.9	6.1	4.3
2,3-Epoxy squalene	65.0	60.9	13.6	12.3

^aCalculation of variability: (highest − lowest value)/highest value × 100 (%).

According to our supplier, there may be small but no significant agroclimatic differences between these 5 locations in the Indian state Tamil Nadu. Flowers for sample A were collected from the primary region of cultivation and are from the western part of Tamil Nadu comprising the higher elevation areas of the plateau region of South India. Flowers for samples B and C were from the middle elevation plateau region in the northwestern part of Tamil Nadu while flowers for samples D and E are from the lower elevation plateau region of south-central Tamil Nadu (see Table 4 for details).

Findings for the commercial samples F-J were a bit different from the lab samples. Variations range between 16% for benzyl acetate and 89.7% for indole (Table 5). Only indole, (Z)-jasmone, and (E)-phytyl acetate variations were higher compared with the lab samples, while all others were lower. Absolute I showed higher amounts of benzyl alcohol and eugenol levels and lower amounts of indole, isophytol, squalene, and 2,3-epoxy squalene compared with F-H/J.

Interestingly, our perfumers pointed out that the odor profile of samples A-E produced via the “J. sambac-way” was more reminiscent of a living flower with a much fresher, green, and more natural floral note compared with the commercial absolutes F-J produced via the traditional “J. grandiflorum-way” from already opened flowers (for details see Table 6). The odor was very appealing for our perfumers, and the odor differences were also mirrored in the composition. We focused only on compounds where we saw a lower or higher trend over all 5 lab samples A-E compared with the commercial samples F-J. The lab samples generated via the “J. sambac-way” contained higher amounts of (Z)-jasmone (1) and δ-jasmine lactone (2) but lower amounts of (3Z,6E)-α-farnesene, geranyllinalool, methyl oleate, methyl stearate, and 2,3-epoxy squalene. Especially (Z)-jasmone (1) and δ-jasmine lactone (2) (Figure 1) caught our attention as the odor descriptions fitted quite well to the odor differences.

Table 6

Odor Description of 3 Commercial J. grandiflorum Absolutes From India, Egypt, and Morocco and an Indian J. grandiflorum Absolute^a Produced by the “J. sambac-Way”.^b

Origin	Odor description
India	Premium very intense blooming jasmine quality with a floral, narcotic animalic indolic top note with sweet fruity banana-like aspects and a distinct green complex with a slightly salicylic and ylang-ylang-like note, body slightly fatty and a bit spicy. Dry-down: lasts up to 4 days on the smelling strip with a rich warm animalic jasmine note.
Egypt	Compared with Indian quality less intense blooming, less narcotic indolic but more floral green aspects, a bit more oily and tea-like note. Dry-down: less long-lasting and radiant, up to 3 days on smelling strip.
Morocco	In comparison to the Indian quality, less intense blooming, less jasminic, narcotic indolic note and less fruity but with nice fresh green floral aspects and a more refined green note. Dry-down: least long-lasting jasmine (2 days on smelling strip) compared with samples from India and Egypt and less radiant.
India^a	Very similar to commercial Indian J. grandiflorum flower absolute but with a more natural fresh green, clean floral note reminiscent of fresh living flowers with some warm spicy aspects, a bit less animalic, fatty, and less banana-like fruity but more sweet natural fruity with slight apple aspects.

^aProduced via “J. sambac way”.

^bOn smelling blotter as 10% ethanol solution.

Figure 1

Lipoxygenase pathway derivative compounds: (Z)-jasmone (1), δ-jasmine lactone (2), (Z)-methyl jasmonate (3), γ-jasmine lactone (4), and ethyl 5-hydroxy-7-decanoate (5) derived from 2.

The above comparison was based on pilot plant samples using small amounts of plant materials, whereas commercial samples using large quantities. Oftentimes, for commercial samples, various jasmine lots are pooled into 1 batch to achieve a commercial standardization to fulfill customers’ quality control standards. To prove our hypothesis further and to draw a more reliable conclusion, we decided to repeat a trial 2 years later using similar amounts of plant materials from the same growing region and process both under pilot plant conditions (Tables 2 and 4 entry K and L).

Absolute K was produced by the “J. sambac-way” while absolute L by the traditional “J. grandiflorum-way.” This also eliminated possible processing differences and ruled-out a one-off annual effect. The exceptionally high levels of p-cresol in both samples L and K and the high amount of (3E,6E)-α-farnesene in K are worth to mention as they were not detected in samples A-J. The trend for 5 compounds stayed the same, while (3Z,6E)-α-farnesene and methyl stearate were detected in equal amounts. Geranyllinalool, methyl oleate, and 2,3-epoxy squalene in absolute K were higher, while the (Z)-jasmone (1) level was lower compared with trials A-E. δ-Jasmine lactone (2) showed the same results as before.

Both (Z)-jasmone (1)²⁷ and δ-jasmine lactone (2)²⁸ are derived via the lipoxygenase (LOX) pathway of plants starting from the fatty acids linoleic and α-linolenic acid.^29

-32 (Z)-Methyl jasmonate (trans-3),²⁴ (Z)-methyl epi-jasmonate (cis-3),³³ and (Z)−3-hexenol derivatives³⁴ are also formed via the LOX pathway but are not found in higher amounts. A closer look into literature showed their biological importance.^35

-39 (Z)-Jasmone (1) is released in some plants when the plant is damaged by herbivores and plays a role in plant defense and attracting pollinators.^35,40 δ-Jasmine lactone (2) is also released in response to multiple stresses as demonstrated in tea leaves.²⁷ Picking of flowers is definitively an induced stress for plants, and the biological pathways are still functioning. Buds (entry K) are placed on the floor for 4-5 hours giving them additional time for de-novo synthesis of plant volatiles or the liberation of volatiles from storages compared to open flowers, which are directly extracted (entry L). This is one possible explanation for the higher amounts of (Z)-jasmone (1) and δ-jasmine lactone (2) in the absolutes A-E/K produced via the “J. sambac-way.” However, this phenomenon is not observed in J. sambac where both compounds are detected at very low levels (<0.1%).^13,25 This together with the fact that even higher amounts of both volatiles 1 and 2 were found in J. auriculatum ^25,41 could indicate more toward their role to attract different pollinators.^42
-44 In general, the mechanism of plant volatiles’ formation and the reason for emission or changes in composition are still in its infancy and deserve further attention.^45

-50

We also found other δ-lactone 2 related compounds (Figure 1). γ-Jasmine lactone (4) was undoubtedly identified in trace amounts in both samples K and L and in all other samples A-J/M-T independent of locations.^18,19,51 Lactone 4 can be either an artifact formed from δ-lactone 2 via ring opening and a consecutive acid-catalyzed dehydration-rehydration process^51,52 or a natural product derived via the LOX pathway most likely from an α-ketol intermediate via ketol-endiol tautomerization.³⁹ Compound 4 was characterized in various other natural products pointing more to the fact that a natural pathway to this molecule should exist.⁵³ In the GC of K and L, we also found an additional major peak (0.7/0.5%) which was identified as the ethyl ester of the cleaved δ-jasmine lactone 5, which is definitively a production artifact. This peak was significantly higher in samples K and L compared with all other Indian samples whose levels range from trace to 0.1%. All Moroccan absolutes R-T contained 0.1% of ethyl 5-hydroxy-7-decanoate (5), while the Egyptian samples M-Q gave a mixed picture (0.2/0.7/t/0.4/0.1%).

Besides India, J. grandiflorum is grown only in 2 Northern African countries today on a larger commercial scale. The second largest producer of J. grandiflorum flowers after India is Egypt.⁵ Together, these 2 countries produce 95% of jasmine concrete.^14,15 Most plantations are located in the Nile delta in the governorate of Gharbia in the municipal of Kotoor around the village of Shoubra Beloula and smaller quantities come from the governorate Faiyum in the municipal of Faiyum. The season lasts normally from June till October but is sometimes extended to November.¹⁵

Morocco is the third largest grower country of J. grandiflorum flowers but on a much smaller commercial scale compared with India and Egypt.^5,15 Harvest season is early June to the middle of December. Plots are scattered in various areas like Maazis, Tiddas, M’Nasra, Khémisset, the surrounding of Rabat and other places exist as well.⁵⁴

Significantly, smaller quantities of jasmine flowers are produced in France around Grasse.⁵ Even so, France has today other than in the past⁵⁵ no real commercial relevance as a cultivation country of J. grandiflorum. The jasmine absolutes originating from France are used from very few precious fine fragrance houses. Nevertheless, till today French natural raw material manufacturers still play an important role as suppliers of various jasmine absolutes. They buy jasmine concretes from the respective producer countries and convert concretes into absolutes in France using their processing knowledge.

Besides these 4 countries, there are several more countries around the world where J. grandiflorum bushes are grown and which may still produce very minute quantities of jasmine flowers. South Africa has cultivated or is still cultivating a few hectares of jasmine bushes in the area of Rustenburg,^15,54 same applies for countries like Italy, Spain, Algeria,^54,55 Turkey,⁵⁶ and China⁵⁷ but all are not or no longer of any commercial relevance as concrete manufacturers.^5,15

To complete our work on J. grandiflorum, we further investigated geographic variations covering today’s main growing countries: India, Egypt, and Morocco, respectively. Various studies have been published before 1995 on geographic comparisons covering countries that have since then lost their importance^54,58 or covering only 2 countries.^26,59 Only Monique Remy⁶⁰ compared all 3 locations at her lecture in Digne les Bains in 1994.⁶¹ Since then, French manufacturers share the commercial field with local producers, harvesting procedures have been refined, extraction techniques improved, and solvents like benzene, etc., banned due to regulatory reasons.

On top of the 5 commercial Indian absolutes F-J, we analyzed 5 commercial Egyptian M-Q, and 3 Moroccan R-T jasmine absolutes (Table 3) all from different suppliers to better understand the differences between the three current main growing countries: India, Egypt, and Morocco. In the Egyptian absolutes N and O, higher tricosene levels were found compared with the other 3 M/P/Q. (E)-Nerolidol was highest in the Egyptian sample N compared with the other Egyptian samples M/O-Q. The absolutes from Morocco R-T were comparable among each other except a higher (E)-phytol level in sample R and a slightly higher level of benzyl alcohol and benzyl benzoate in sample S.

In all, J. grandiflorum absolutes from the 3 locations, benzyl acetate, benzyl benzoate, 2,3-epoxy squalene, phytol, isophytol, (E)-phytyl acetate, and squalene were identified as the main ingredients. These findings were in line with previously published J. grandiflorum compositions of this species from India,^{25,26,60,62,63} Egypt,^26,59,60,64 and Morocco.^59,60 Variations range between 6.1% for squalene and 54.5% for indole in the absolutes from Egypt M-Q and between 4.3% for squalene and 43.4% for (E)-phytol in the Moroccan absolutes R-T, respectively (Table 5) compared with the Indian commercial absolutes F-J ranging from 16.0% in benzyl acetate and 89.7% in indole. The general variability was lower in the absolutes from North Africa compared with the Indian absolutes. Indole variations were very high across all three geographic locations and have been well documented in literature before.^54,61,65 Variations of linalool and benzyl acetate both following a circadian cycle⁶¹ were much less obvious in our investigation in the commercial samples compared with variations in other compounds like (E)-phytyl acetate. (E)-Phytol has the highest variability in the absolutes from Morocco R-T similar to the Indian samples F-J, while (Z)-jasmone has a high variability only in the Indian commercial samples F-J.⁶¹

Odor of the absolutes was comparable among the 3 locations but there are also obvious differences (Table 6), and the Indian absolutes were the most preferred. A detailed odor evaluation of 4 jasmine absolutes by our perfumers in a 10% solution in ethanol (EtOH) on smelling strips is given in Table 6. We used randomly J. grandiflorum from India as a reference.

Besides odor, the 3 locations can be distinguished via composition. As the number of samples was way too low to perform a proper statistic as outliers would have a big influence, therefore, we compared the locations manually. We split our analysis between 22 major compounds (>0.2% in average value) and 13 minor compounds. In Table 7, the composition range of the 3 commercial J. grandiflorum absolutes from India, Egypt, and Morocco is summarized with possible natural outliers in brackets. Thirteen out of 22 major compounds showed a similar composition range, including all fatty acid methyl esters (methyl palmitate, methyl linolenate, methyl oleate, and methyl stearate), and also benzyl alcohol, benzyl acetate, indole, eugenol, (3Z)-hexenyl benzoate, geranyllinalool, isophytol, (E)-phytol, and (E)-phytyl acetate. The commercial jasmine absolutes from India showed higher levels of linalool and benzyl benzoate and slightly higher levels of p-cresol compared with their North African counterparts. The Egyptian absolutes had a slightly higher content of δ-jasmine lactone and (3E,6E)-α-farnesene compared to the Indian absolutes. The commercial absolutes from Morocco featured the most deviations: δ-jasmine lactone, (3E,6E)-α-farnesene, (Z)-methyl jasmonate, and squalene levels were higher, and (Z)-jasmone was slightly higher, while 2,3-epoxy squalene levels were lower compared with the absolutes from Egypt and India. All 3 locations showed a very similar composition for the 12 minor compounds other than the slightly higher amount of (3Z,6E)-α-farnesene and tricosene in the jasmine absolute from Egypt. However, in 3 out of 5 samples, tricosene was found in low amounts similar to the absolutes from India and Morocco.

Table 7

Composition Range (Area %) of Major (1-22) and Minor (1'-13') Compounds of Commercial J. grandiflorum Absolutes From India,^a Egypt, and Morocco and Comparison with Literature Data.^b

Entry	No. Tab 2/3	RI	Compound	India^a	Egypt	Morocco	India literature^26,60,62,63	Egypt literature^{26,54,59,60,64}	Morocco literature^59,60
1	2	1011	Benzyl alcohol	0.4-1.2 (2.8)	0.9-1.4	1.2-1.7	1.1-1.8	0.2-0.9	nr
2	3	1048	p-Cresol	0.4-0.8 (1.2)	0.2-0.4	0.2-0.3	0.6-1.5	0.1	nr
3	5	1085	Linalool	3.7-5.4	2.3-3.0	3.0-3.4	3.5-8.2	3.0-6.0	4.4-5.9
4	7	1134	Benzyl acetate	15.5-18.7	14.2-15.7	14.3-18.2	18.1-24.5 (29.7)	14.4-26.7	18.3-19.2
5	9	1254	Indole	0.3-2.9	1.2-2.2	1.2-1.9	0.7-3.2	1.0-3.5 (6.5)	1.1
6	11	1328	Eugenol	1.2-3.0	0.9-2.0	1.9-2.2	1.4-3.0 (4.0)	1.1-2.5 (3.4)	1.4-1.8
7	12	1368	(Z)-Jasmone	1.2-2.4	1.8-2.2	2.3-2.9	1.5-3.7 (9.5)	1.9-3.5	2.7
8	13	1443	δ-Jasmine lactone	0.2-0.4	0.3-0.6	0.8-1.2	0.3‐1.5	0.6‐1.5	1.1-2.3
9	15	1496	(3E,6E)-α-Farnesene	0.8-1.2	1.2-1.7	1.6-2.2	nr	2.1‐4.4	nr
10	16	1544	(3Z)-Hexenyl benzoate	0.7-1.0	1.0-1.5	1.1-1.2	nr	1.1‐2.0	nr
11	18	1605	(Z)-Methyl jasmonate	0.2-0.8 (1.1)	0.9-1.1	1.2-1.5	0.2-0.8 (7.2)	0.5‐1.2	1.3
12	20	1718	Benzyl benzoate	11.4-18.7	8.5-10.0	9.7-12.0	11.1-21.2	8.0-16.4	11.0-16.3
13	22	1907	Methyl palmitate	1.5‐1.8	1.4‐1.5	1.2‐1.5	nr	nr	nr
14	23	1937	Isophytol	6.4-8.0	5.7‐7.9	5.0-6.0	(2.0) 5.0-8.0	4.6-8.6	6.9-9.8
15	24	2014	Geranyllinalool	3.0-3.8	2.8-3.6	3.2-4.0	2.5‐4.4	2.3-3.5 (8.4)	3.8-9.5
16	26	2074	Methyl linolenate	1.7-2.3	1.9-2.4	2.5-2.7	nr	3.3-4.2	nr
17	27	2078	Methyl oleate	0.8-1.0	0.8	0.7‐0.8	nr	nr	nr
18	28	2096	(E)-Phytol	4.8-10.9	7.9-10.6	6.0-10.6	7.0-10.9 (13.3)	7.0-12.0	7.5-9.9
19	29	2109	Methyl stearate	0.2-1.0	0.4-0.7	0.4-0.6	nr	nr	nr
20	30	2208	(E)-Phytyl acetate	3.9-6.8	4.5-7.3	5.6-7.2	2.5-5.5	3.5-10.1	7.0
21	34	2792	Squalene	2.7-4.9	4.6-4.9	6.6-6.9	2.5-4.5	3.5-6.0	4.8
22	35	2911	2,3-Epoxy squalene	(4.3) 7.2-11.7	10.2-11.8	6.4-7.3	7.0-11.0	8.0-12.0	6.7
1'	1	986	(3Z)-Hexenyl acetate	t - < 0.1	t - 0.2	<0.1	nr	nr	nr
2'	4	1073	Methyl benzoate	<0.1‐0.2	<0.1‐0.1	<0.1‐0.1	0.3‐1.0	0.3‐0.6	0.5
3'	6	1092	Benzyl cyanide	nd - 0.1	<0.1‐0.1	<0.1	nr	nr	nr
4'	8	1173	Methyl salicylate	<0.1‐0.1	<0.1	<0.1	nr	nr	nr
5'	10	1310	Methyl anthranilate	nd - t	t - < 0.1	t - < 0.1	0.4‐0.8	nr	nr
6'	14	1483	(3Z,6E)-α-Farnesene	t - 0.1	0.2‐0.4	<0.1	nr	nr	nr
7'	17	1548	(E)-Nerolidol	0.1‐0.2	0.1‐0.3 (0.6)	0.2	nr	nr	nr
8'	19	1634	(Z)-Methyl epi-jasmonate	<0.1‐0.4	0.1	0.1	nr	nr	nr
9'	21	1817	Benzyl salicylate	0.1‐0.2	<0.1‐0.1	<0.1	nr	nr	nr
10'	25	2072	Methyl linolate	0.2	0.2‐0.3	0.2-0.3	nr	nr	nr
11'	31	2300	Tricosene	nd-0.2	t - 0.2 (1.2)	nd <0.1	nr	nr	nr
12'	32	2552	Benzyl palmitate	nd-0.1	nd - 0.3	nd-0.2	nr	nr	nr
13'	33	2688	Benzyl linolenate	nd-0.3	nd-0.3	nd-0.4	nr	nr	nr

Abbreviations: nd, not detected; nr, not reported; RI, retention index; tr, trace (≤0.01%); ( ), values in parenthesis are outliers.

^aInclusive J. grandiflorum values from literature.²⁵

^bMeasured on ZB-1 column.

In addition, we created a literature range for an Indian,^26,60,62,63 Egyptian,^{26,54,59,60,64} and Moroccan^59,60 absolute from published data taking single analysis as well as ranges into consideration. We have some doubts on values given in the publication from Verghese and Sunny⁶³ for Indian J. grandiflorum absolutes as some compounds like (Z)-jasmone, methyl jasmonate, and methyl anthranilate are significantly higher and isophytol levels are much lower compared with other literature data for the same species and our own values. Literature data points for Egyptian absolutes are well aligned and cover several analyses while only 2 references^59,60 were found for the absolutes from Morocco. In general, our analyses are well aligned with the literature references, but benzyl acetate, methyl benzoate, and δ-jasmine lactone ranges are higher in literature for all 3 countries compared with our findings. Linalool levels are higher in literature for the Egyptian and Moroccan absolutes compared with our findings. A detailed comparison is presented in Table 7.

In summary, composition variations in natural products are a given and necessary for the survival of the species.⁶⁶ Geographic origin plays a significant role in such variations as demonstrated here for J. grandiflorum and in a previous publication for J. sambac.¹³ Harvest time and year also play a part in such composition differences.^54,63,67 All the above points are influenced by various abiotic and biotic factors like climate, soil, herbivores, parasites, etc.

In commercial products, manufacturing processes should not be neglected as a further key factor for variations. However, suppliers also use such processes to reduce variations and to achieve a standardization of natural products according to customers’ specifications. Variations can be observed, too, when plants are harvested at different stages of their development. Harvesting and processing of plant material for the flavor and fragrance industry are oftentimes based on heritage and traditional knowledge but most of the time has never been scientifically questioned or assessed. Agricultural practices have taken flowering times and other obvious factors into consideration and adapted of course to crop usage patterns like shown for the Jasminum species sambac and grandiflorum (Table 1) to finance the livelihood of the farmers. Better understanding such correlations and creatively changing the same has the potential to lead to new and olfactive exciting qualities of existing raw materials as demonstrated in this paper for J. grandiflorum.

Experimental

General

GC/MS: Agilent 6890 GC (ZB-1: 60m × 0.25 mm × 0.25µm film thickness, carrier gas He, 60 °C-280 °C at 4 °C/min) connected to Finnigan MAT SSQ 7000 quadrupole mass spectrometer, 70 eV (EI mode), mass range 25-450amu. GC: Hewlett Packard 6890 with FID and sniffing port (for column and temperature program, see GC/MS). All solvents and reagents are commercial products (Merck) and were used as received.

Plant Material

Jasminum grandiflorum flower buds for absolutes A-E/K were harvested by farmers in the south Indian state of Tamil Nadu (for location details see Table 4) between 6 am and 11 am, 24 hours before they are normally picked as open flowers. From the flower markets, buds were transported to the factory where they arrived between 7.30 pm and 9 pm. Buds were spread on the floor for 4-5 hours to blossom and then extracted in the pilot plant. Opened flowers were picked in the traditional way and extracted for absolute L.

Concrete/Absolute Manufacturing

Buds were allowed to blossom out before extraction while freshly picked flowers were directly extracted with n-hexane followed by filtration and solvent evaporation under reduced pressure to yield a waxy dark brown fragrant concrete. Concrete was dissolved in ethanol, chilled, and filtered. The filtrate was evaporated under reduced pressure to obtain a reddish-brown viscous liquid absolute with a delicate jasmine odor. The average absolute yield starting from fresh J. grandiflorum buds (“J. sambac-way”) was 0.17%.

Flower absolutes of J. grandiflorum (A-E/K/L) were processed and obtained from JASMINE Concrete Exports Pvt. Ltd., Chennai (Tamil Nadu), India.

Commercial Absolutes

All commercial samples from India F-J, Egypt M-Q, and Morocco R-T were sourced from various suppliers on the open market in India, Egypt, and France covering jasmine crops of the years 2009-2014.

Spectral Data of Jasmine Lactones and Derivatives

(Z)-7-Ddecen-5-olide (=6-[(Z)-pent-2-enyl]oxan-2-one = δ-jasmine lactone) (2)

RI_DB-1 1443, RI_DB-WAX 2262. C₁₀H₁₆O₂ M = 168. GC /MS m/z (%): 39 (9), 41 (20), 42 (9), 43 (18), 55 (32), 67 (8), 68 (9), 71 (74), 79 (7), 81 (10), 99 (100), 108 (10), 121 (1), 122 (1), 139 (1), 150 (7), 168 (7).

(Z)-7-Decen-4-olide (=5-[(Z)-hex-3-enyl]oxolan-2-one = γ-jasmolactone = γ-jasmine lactone) (4)

RI_DB-1 1402, RI_DB-WAX 2162. C₁₀H₁₆O₂ M = 168. GC/MS m/z (%): 27 (10), 29 (26), 39 (8), 41 (23), 54 (6), 55 (14), 56 (6), 57 (5), 67 (14), 68 (100), 69 (10), 79 (8), 81 (7), 85 (26), 93 (5), 95 (6), 98 (3), 108 (7), 111 (6), 122 (1), 139 (1), 150 (1), 168 (1).

Ethyl (Z)-5-hydroxy-7-decenoate (5)

RI_DB-1 1533, RI_DB-WAX 2265. C₁₂H₂₂O₃ M = 214. GC/MS m/z (%): 39 (9), 41 (16), 42 (8), 43 (16), 45 (7), 55 (28), 67 (7), 68 (8), 71 (59), 79 (7), 81 (9), 99 (100), 108 (10), 115 (2), 122 (2), 133 (1), 139 (1) 145 (11), 150 (6), 168 (4), 196 (1).

Footnotes

Acknowledgments

We are especially grateful to Raja S. Palaniswamy, Jasmine C. E. Pvt. Ltd., Chennai, Tamil Nadu, India, for the generous gift of jasmine absolutes, many helpful discussions, the information in and the summary of sampling locations in India. We owe a special thanks to Dr Daniel Joulain, Grasse, France, for the very cooperative exchanges and discussions about jasmine absolute and in particular on current growing regions and the ring-opening product 5. We thank our colleague Birgit Kohlenberg, Symrise AG, Holzminden, Germany, for helpful support, and our perfumers with a special mention to M Subramanian, Symrise Asia Pacific Pte. Ltd., Singapore, for odor evaluation. Dedicated to my PhD supervisor and great mentor Professor Dr Dietrich Spitzner, formerly University of Hohenheim, Stuttgart, Germany, on the occasion of his 80th birthday in July 2020.

Declaration of Conflicting Interests

The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Funding

The author(s) received no financial support for the research, authorship, and/or publication of this article.

ORCID iD

Norbert A. Braun

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