Efficient Saponification and Separation of Unsaponifiables for Authentication of Sesame Oil Using FT-IR Spectroscopy and Chemometrics

Wen-xuan HE; Qi LIN

doi:10.3964/j.issn.1000-0593(2021)01-0319-08

Journals >Spectroscopy and Spectral Analysis >Volume 41 >Issue 1 >Page 319 > Article

Spectroscopy and Spectral Analysis
Vol. 41, Issue 1, 319 (2021)

Efficient Saponification and Separation of Unsaponifiables for Authentication of Sesame Oil Using FT-IR Spectroscopy and Chemometrics

Wen-xuan HE^* and Qi LIN

Author Affiliations

Department of Materials and Engineering, Engineering and Reaearch Center of New Chinese Lacquer Materials, Minjiang University, Fuzhou 350108, China

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DOI: 10.3964/j.issn.1000-0593(2021)01-0319-08 Cite this Article

Wen-xuan HE, Qi LIN. Efficient Saponification and Separation of Unsaponifiables for Authentication of Sesame Oil Using FT-IR Spectroscopy and Chemometrics[J]. Spectroscopy and Spectral Analysis, 2021, 41(1): 319 Copy Citation Text

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Fig. 1. Pictorial representation of designed SPE cartridge

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Fig. 2. FT-IR spectra of sesame oil and its unsaponifiable

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Fig. 3. FT-IR spectra of vegetable oils and their unsaponifiable

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Fig. 4. FT-IR spectra for reproducibility experiments of saponification

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Fig. 5. Results of the permutation test of the model Ⅰ and Ⅱ

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Entry	Sample	Score value	Accuracy	Entry	Sample¹	Score value	Accuracy²
1	Sesame oil-1	1.01	T	19	Ses-soybean oil-Ⅰ	0.84	T
2	Sesame oil-2	0.95	T	20	Ses-soybean oil-Ⅱ	0.85	T
3	Sesame oil-3	1.03	T	21	Ses-soybean oil-Ⅲ	0.75	T
4	Sesame oil-4	1.00	T	22	Ses-corn oil-Ⅰ	0.90	F
5	Sesame oil-5	1.01	T	23	Ses-corn oil-Ⅱ	0.86	T
6	Sesame oil-6	0.93	T	24	Ses-corn oil-Ⅲ	0.82	T
7	Sesame oil-7	1.05	T	25	Ses-palm oil-Ⅰ	0.82	T
8	Sesame oil-8	0.99	T	26	Ses-palm oil-Ⅱ	0.84	T
9	Sesame oil-9	0.97	T	27	Ses-palm oil-Ⅲ	0.78	T
10	Sesame oil-10	0.90	T	28	Ses-cottonseed oil-Ⅰ	0.82	T
11	Cottonseed oil-1	-0.01	T	29	Ses-cottonseed oil-Ⅱ	0.83	T
12	Cottonseed oil-2	0.09	T	30	Ses-cottonseed oil-Ⅲ	0.76	T
13	Palm oil-1	-0.01	T	31	Ses-Mixed oil-Ⅰ	0.92	F
14	Palm oil-2	-0.05	T	32	Ses-Mixed oil-Ⅱ	0.81	T
15	Soybean oil-1	-0.03	T	33	Ses-Mixed oil-Ⅲ	0.73	T
16	Soybean oil-2	0.02	T	34	Sesame-rural-Ⅰ	0.78	T
17	Corn oil-1	0.04	T	35	Sesame-rural-Ⅱ	-0.40	T
18	Corn oil-2	0.02	T

Table 1. Score values of the testing set with model Ⅱ

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S.No.	Samples	Sensitivity	Specificity	Detected adulterant level(V/V%)
1	Sesame oils	-	100% (10/10)	-
2	Cheaper edible oils	100% (8/8)	-	-
3	Adulterated sesame oils containing palm or cottonseed or soybean oil	100% (9/9)	-	4
4	Adulterated sesame oils containing corn or mixed oil	67% (4/6)	-	10
5	Blind samples from rural area	100% (2/2)	-	-

Table 2. Predicted results of the testing set with model Ⅱ

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Entry	Sample	Score value	Accuracy	Entry	Sample¹	Score value	Accuracy²
1	Sesame oil-1	1.03	T	19	Ses-soybean oil-Ⅰ	0.90	F
2	Sesame oil-2	0.96	T	20	Ses-soybean oil-Ⅱ	1.09	T
3	Sesame oil-3	0.92	T	21	Ses-soybean oil-Ⅲ	1.07	T
4	Sesame oil-4	0.88	T	22	Ses-corn oil-Ⅰ	0.97	F
5	Sesame oil-5	1.02	T	23	Ses-corn oil-Ⅱ	101	F
6	Sesame oil-6	0.99	T	24	Ses-corn oil-Ⅲ	0.91	F
7	Sesame oil-7	0.94	T	25	Ses-palm oil-Ⅰ	0.63	T
8	Sesame oil-8	0.93	T	26	Ses-palm oil-Ⅱ	1.48	T
9	Sesame oil-9	0.89	T	27	Ses-palm oil-Ⅲ	1.57	T
10	Sesame oil-10	0.96	T	28	Ses-cottonseed oil-Ⅰ	1.05	F
11	Cottonseed oil-1	0.63	T	29	Ses-cottonseed oil-Ⅱ	1.09	T
12	Cottonseed oil-2	0.52	T	30	Ses-cottonseed oil-Ⅲ	1.13	T
13	Palm oil-1	-1.49	T	31	Ses-Mixed oil-Ⅰ	0.98	F
14	Palm oil-2	-2.01	T	32	Ses-Mixed oil-Ⅱ	0.93	F
15	Soybean oil-1	-0.01	T	33	Ses-Mixed oil-Ⅲ	0.98	F
16	Soybean oil-2	0.03	T	34	Sesame-rural-Ⅰ	0.85	F
17	Corn oil-1	-0.15	T	35	Sesame-rural-Ⅱ	0.83	F
18	Corn oil-2	-0.02	T

Table 3. Score values of the testing set with model Ⅳ

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S.No.	Samples	Sensitivity	Specificity	Detected adulterant level(V/V%)
1	Sesame oils	-	100% (10/10)	-
2	Other edible oils	100% (8/8)	-	-
3	adulterated sesame oil containing palm oil	100% (3/3)	-	4
4	adulterated sesame oil containing soybean or cotton oil	67% (4/6)	-	10
5	adulterated sesame oil containing corn or mixed oil	- (0/6)	-	-
6	Blind samples from rural area	-(0/2)	-	-

Table 4. Predicted results of the testing set with model Ⅳ

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