Determination of Organophosphorus Pesticides in Soybean Oil, Peanut Oil and Sesame Oil by Low-Temperature Extraction and GC-FPD

2007 ◽  
Vol 66 (7-8) ◽  
pp. 625-629 ◽  
Author(s):  
Li Li ◽  
Zhiqiang Zhou ◽  
Canping Pan ◽  
Chuanfan Qian ◽  
Shuren Jiang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Soybean Oil ◽  
Organophosphorus Pesticides ◽  
Sesame Oil ◽  
Peanut Oil ◽  
Low Temperature Extraction

scholarly journals Determination of 2-Propenal Using Headspace Solid-Phase Microextraction Coupled to Gas Chromatography–Time-of-Flight Mass Spectrometry as a Marker for Authentication of Unrefined Sesame Oil

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Ahmad Rois Mansur ◽  
Tae Gyu Nam ◽  
Hae Won Jang ◽  
Yong-Sun Cho ◽  
Miyoung Yoo ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Soybean Oil ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Time Of Flight ◽  
Sesame Oil ◽  
Headspace Solid Phase Microextraction ◽  
Flight Mass Spectrometry

Ascertaining the authenticity of the unrefined sesame oil presents an ongoing challenge. Here, the determination of 2-propenal was performed by headspace solid-phase microextraction (HS-SPME) under mild temperature coupled to gas chromatography with time-of-flight mass spectrometry, enabling the detection of adulteration of unrefined sesame oil with refined corn or soybean oil. Employing this coupled technique, 2-propenal was detected in all tested refined corn and soybean oils but not in any of the tested unrefined sesame oil samples. Using response surface methodology, the optimum extraction temperature, equilibrium time, and extraction time for the HS-SPME analysis of 2-propenal using carboxen/polydimethylsiloxane fiber were determined to be 55°C, 15 min, and 15 min, respectively, for refined corn oil and 55°C, 25 min, and 15 min, respectively, for refined soybean oil. Under these optimized conditions, the adulteration of unrefined sesame oil with refined corn or soybean oils (1–5%) was successfully detected. The detection and quantification limits of 2-propenal were found to be in the range of 0.008–0.010 and 0.023–0.031 µg mL−1, respectively. The overall results demonstrate the potential of this novel method for the authentication of unrefined sesame oil.

scholarly journals Cooking Oil Consumption Is Positively Associated with Risk of Type 2 Diabetes in a Chinese Nationwide Cohort Study

2020 ◽  
Vol 150 (7) ◽  
pp. 1799-1807
Author(s):  
Pan Zhuang ◽  
Lei Mao ◽  
Fei Wu ◽  
Jun Wang ◽  
Jingjing Jiao ◽  
...  
Keyword(s):  
Type 2 Diabetes ◽  
Fatty Acids ◽  
Soybean Oil ◽  
Canola Oil ◽  
Sesame Oil ◽  
Peanut Oil ◽  
Nutrition Survey ◽  
Plant Oil ◽  
Cooking Oils

ABSTRACT Background Evidence suggests that the relations between intakes of individual fatty acids and risk of type 2 diabetes (T2D) vary. However, associations between intakes of different cooking oils as sources of fatty acids and incident T2D remain largely unknown. Objectives We aimed to evaluate relations between intakes of individual cooking oils and incident T2D in a nationwide Chinese cohort. Methods Overall 15,022 Chinese adults aged ≥20 y from the China Health and Nutrition Survey (CHNS) without self-reported T2D at entry in the 1997, 2000, 2004, 2006, or 2009 rounds were followed up until 2011. Consumption of various cooking oils/fats including lard, peanut oil, soybean oil, canola oil, sesame oil, and refined blended plant oil was assessed using 3-d 24-h records in each survey and the cumulative mean intake was calculated. Multivariable-adjusted Cox proportional hazards regression models were constructed to estimate the HRs of T2D. Results A total of 1014 cases were recorded after a median follow-up of 14 y. The intakes of animal and plant cooking oils/fats were both associated with higher T2D risk. Compared with nonconsumers, multivariable-adjusted HRs and 95% CIs for the highest tertiles were 1.31 (1.03, 1.67) for lard, 1.36 (1.10, 1.66) for peanut oil, 1.14 (0.91, 1.43) for soybean oil, 1.11 (0.87, 1.43) for canola oil, 1.02 (0.79, 1.32) for sesame oil, and 1.42 (1.12, 1.82) for refined blended plant oil. Substituting 1 tablespoon/d (8 g · 2000 kcal−1 · d−1) of soybean oil for the sum of lard, peanut oil, refined blended plant oil, and other plant oils was associated with a 3% (HR: 0.97; 95% CI: 0.95, 0.99) lower risk of T2D. Conclusions Intakes of lard, peanut oil, and refined blended plant oil but not soybean oil, canola oil, and sesame oil are associated with higher T2D risk. Reducing the consumption of cooking oils in general may be protective against T2D among the Chinese population. This trial was registered at clinicaltrials.gov as NCT03259321.

scholarly journals Determination of Aflatoxins B1, B2, G1, and G2 in Olive Oil, Peanut Oil, and Sesame Oil

2010 ◽  
Vol 93 (3) ◽  
pp. 936-942 ◽  
Author(s):  
Lei Bao ◽  
Mary W Trucksess ◽  
Kevin D White
Keyword(s):  
Olive Oil ◽  
Edible Oils ◽  
Lower Layer ◽  
Multiple Reaction Monitoring ◽  
Animal Health ◽  
Sesame Oil ◽  
Peanut Oil ◽  
Immunoaffinity Column ◽  
Accuracy And Repeatability

Abstract Edible oils are consumed directly, and used as ingredients in food, soaps, and skin products. However, oils such as olive oil, peanut oil, and sesame oil could be contaminated with aflatoxins, which are detrimental to human and animal health. A method using immunoaffinity column cleanup with RPLC separation and fluorescence detection (FLD) for determination of aflatoxins (AF) B1, B2, G1, and G2 in olive oil, peanut oil, and sesame oil was developed and validated. Test samples were extracted with methanolwater (55 + 45, v/v). After shaking and centrifuging, the lower layer was filtered, diluted with water, and filtered through glass microfiber filter paper. The filtrate was then passed through an immunoaffinity column, and the toxins were eluted with methanol. The toxins were then subjected to RPLC/FLD analysis after postcolumn UV photochemical derivatization. The accuracy and repeatability characteristics of the method were determined. Recoveries of AFB1 spiked at levels from 1.0 to 10.0 g/kg in olive oil, peanut oil, and sesame oil ranged from 82.9 to 98.6. RSDs ranged from 0.6 to 8.9. HorRat values were <0.2 for all of the matrixes tested. Recoveries of AF spiked at levels from 2.0 to 20.0 g/kg ranged from 87.7 to 102.2. RSDs ranged from 1.3 to 12.6. HorRat values were <0.4 for all of the matrixes tested. LC/MS/MS with multiple-reaction monitoring was used to confirm the identities of aflatoxins in a naturally contaminated peanut oil.

Determination of Aflatoxins B1, B2, G1, and G2 in Olive Oil, Peanut Oil, and Sesame Oil Using Immunoaffinity Column Cleanup, Postcolumn Derivatization, and Liquid Chromatography/Fluorescence Detection: Collaborative Study

2012 ◽  
Vol 95 (6) ◽  
pp. 1689-1700 ◽  
Author(s):  
Lei Bao ◽  
Chengzhu Liang ◽  
Mary W Trucksess ◽  
Yanli Xu ◽  
Ning Lv ◽  
...  
Keyword(s):  
Olive Oil ◽  
Lower Layer ◽  
Collaborative Study ◽  
Sesame Oil ◽  
Peanut Oil ◽  
Immunoaffinity Column ◽  
Fluorescence Detector ◽  
Repeatability And Reproducibility ◽  
Postcolumn Derivatization

Abstract The accuracy, repeatability, and reproducibility characteristics of a method using immunoaffinity column (IAC) cleanup with postcolumn derivatization and LC with a fluorescence detector (FLD) for determination of aflatoxins (AFs; sum of AFs B1, B2, G1, and G2) in olive oil, peanut oil, and sesame oil have been established in a collaborative study involving 15 laboratories from six countries. Blind duplicate samples of blank, spiked at levels ranging from 0.25 to 20.0 μg/kg for AF, were analyzed. A naturally contaminated peanut oil sample was also included. Test samples were extracted with methanol–water (55 + 45, v/v). After shaking and centrifuging, the lower layer was filtered, diluted with water, and filtered through glass microfiber filter paper. The filtrate was then passed through an IAC, and the toxins were eluted with methanol. The toxins were then subjected to RPLC-FLD analysis after postcolumn derivatization. Average recoveries of AFs from olive oil, peanut oil, and sesame oil ranged from 84 to 92% (at spiking levels ranging from 2.0 to 20.0 μg/kg); of AFB1 from 86 to 93% (at spiking levels ranging from 1.0 to 10.0 μg/kg); of AFB2 from 89 to 95% (at spiking levels ranging from 0.25 to 2.5 μg/kg); of AFG1 from 85 to 97% (at spiking levels ranging from 0.5 to 5.0 μg/kg); and of AFG2 from 76 to 85% (at spiking levels ranging from 0.25 to 2.5 μg/kg). RSDs for within-laboratory repeatability (RSDr) ranged from 3.4 to 10.2% for AF, from 3.5 to 10.9% for AFB1, from 3.2 to 9.5% for AFB2, from 6.5 to 14.9% for AFG1, and from 4.8 to 14.2% for AFG2. RSDs for between-laboratory reproducibility (RSDR) ranged from 6.1 to 14.5% for AF, from 7.5 to 15.4% for AFB1, from 7.1 to 14.6% for AFB2, from 10.8 to 18.1% for AFG1, and from 7.6 to 23.7% for AFG2. Horwitz ratio values were ≤2 for the analytes in the three matrixes.

Accurate Determination of Tributyltin in Tannery Wastewater by a New Procedure Using ID-HPLC–ICP-MS Combined with Low Temperature Extraction

2017 ◽  
Vol 80 (11) ◽  
pp. 1623-1631 ◽  
Author(s):  
Yang Zhao ◽  
Zhiding Huang ◽  
Chao Wei ◽  
Qian Wang ◽  
Ke Xie ◽  
...  
Keyword(s):  
Low Temperature ◽  
Accurate Determination ◽  
Tannery Wastewater ◽  
Icp Ms ◽  
Low Temperature Extraction

Liquid Chromatographic Determination of Adulteration of Sesame Oil

1984 ◽  
Vol 67 (5) ◽  
pp. 916-918
Author(s):  
Li Ming Han ◽  
James M Adams
Keyword(s):  
Soybean Oil ◽  
Chromatographic Determination ◽  
Peak Height ◽  
Sesame Oil ◽  
Peak Height Ratio ◽  
Linear Calibration ◽  
Relative Standard ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A liquid chromatographic (LC) procedure is presented for quantitative determination of adulteration of sesame oil with soybean oil. A portion of the oil is dissolved in chloroform, diluted in the eluant 2-propanolacetone- methanol-acetonitrile (1 + 2 + 3 + 4), and subjected to reverse phase LC. A linear calibration curve is prepared by chromatographing known mixtures of the 2 oils and plotting the volume percent of sesame oil against the peak height ratio of a selected pair of peaks. The relative standard deviation, based on 4 determinations of each of 8 sample mixtures, is less than 2.5% and the correlation coefficient is 99%. Because the LC curve for a given vegetable oil is characteristic and reproducible, the procedure can be extended to detect the adulteration of sesame oil with oils other than, or in addition to, soybean oil. An example of adulteration with rapeseed oil, in addition to soybean oil, is discussed.

scholarly journals Multiresidue Method for the Determination of Organophosphorus Pesticides in Cereal Matrixes

2010 ◽  
Vol 93 (3) ◽  
pp. 999-1006 ◽  
Author(s):  
Maurizio Boccacci Mariani ◽  
Virginia D'aiuto ◽  
Vanessa Giannetti
Keyword(s):  
Molecular Weight ◽  
Low Temperature ◽  
Organophosphorus Pesticides ◽  
Gas Chromatograph ◽  
Neutral Alumina ◽  
The Third ◽  
Acidic Alumina ◽  
Second Procedure ◽  
Nitrogen Phosphorus

Abstract Our research was focused on a preliminary comparison of three cleanup procedures for the determination of 26 organophosphorus (OP) pesticide residues in cereal matrixes. The aim of the study was to reduce the analytical problems associated with the presence of high-molecular-weight compounds in these matrixes in order to improve the efficiency of the chromatographic separation. The method was based on the extraction of OP pesticides from the samples with the use of petroleum ether, acetone, and dichloromethane, and on three different cleanup procedures, followed by GC identification. The first procedure was carried out with a multicartridge system; the second procedure consisted of a low-temperature lipid precipitation; for the third procedure, acid and neutral alumina were used for cleanup of the extract. The use of deactivated acidic alumina as the adsorbent medium and the use of n-hexanedichloromethaneethyl acetate (6 + 3 + 1, v/v/v) as the eluting system were preferred. After purification, the residue was injected into a gas chromatograph for separation followed by nitrogen-phosphorus detection; the identities of the OP pesticides in positive samples were confirmed by GC/MS. The proposed method could be extended to the determination of other OP pesticides in various food matrixes in routine analysis.

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