1
|
Garcia-Llatas G, Alegría A, Barberá R, Cilla A. Current methodologies for phytosterol analysis in foods. Microchem J 2021. [DOI: 10.1016/j.microc.2021.106377] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
|
2
|
Conte L, Bendini A, Valli E, Lucci P, Moret S, Maquet A, Lacoste F, Brereton P, García-González DL, Moreda W, Gallina Toschi T. Olive oil quality and authenticity: A review of current EU legislation, standards, relevant methods of analyses, their drawbacks and recommendations for the future. Trends Food Sci Technol 2020. [DOI: 10.1016/j.tifs.2019.02.025] [Citation(s) in RCA: 78] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
|
3
|
Authenticity Assessment of Extra Virgin Olive Oil: Evaluation of Desmethylsterols and Triterpene Dialcohols. J AM OIL CHEM SOC 2015. [DOI: 10.1007/s11746-015-2759-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
4
|
Novosjolova I, Turks M. User Friendly Synthesis of Vogel’S Silyl Sulfinate and its Application in Quantitative Gc–Ms Analysis. PHOSPHORUS SULFUR 2015. [DOI: 10.1080/10426507.2014.996644] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Irina Novosjolova
- Faculty of Material Science and Applied Chemistry, Riga Technical University, Paula Valdena Str. 3, Riga, LV-1007, Latvia
| | - Māris Turks
- Faculty of Material Science and Applied Chemistry, Riga Technical University, Paula Valdena Str. 3, Riga, LV-1007, Latvia
| |
Collapse
|
5
|
Aragón Á, Toledano RM, Vázquez A, Villén J, Cortés JM. Analysis of polycyclic aromatic hydrocarbons in aqueous samples by large volume injection gas chromatography–mass spectrometry using the through oven transfer adsorption desorption interface. Talanta 2015; 139:1-5. [DOI: 10.1016/j.talanta.2015.02.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Revised: 02/10/2015] [Accepted: 02/17/2015] [Indexed: 11/16/2022]
|
6
|
Scholz B, Wocheslander S, Lander V, Engel KH. On-line liquid chromatography-gas chromatography: A novel approach for the analysis of phytosterol oxidation products in enriched foods. J Chromatogr A 2015; 1396:98-108. [PMID: 25890442 DOI: 10.1016/j.chroma.2015.03.087] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Revised: 03/30/2015] [Accepted: 03/31/2015] [Indexed: 01/03/2023]
Abstract
A novel methodology for the automated qualitative and quantitative determination of phytosterol oxidation products in enriched foods via on-line liquid chromatography-gas chromatography (LC-GC) was established. The approach is based on the LC pre-separation of acetylated phytosterols and their corresponding oxides using silica as stationary phase and a mixture of n-hexane/methyl tert-butyl ether/isopropanol as eluent. Two LC-fractions containing (i) 5,6-epoxy- and 7-hydroxyphytosterols, and (ii) 7-ketophytosterols are transferred on-line to the GC for the analysis of their individual compositions on a medium polar trifluoropropylmethyl polysiloxane capillary column. Thus, conventionally employed laborious off-line purification and enrichment steps can be avoided. Validation data, including recovery, repeatability, and reproducibility of the method, were elaborated using an enriched margarine as example. The margarine was subjected to a heating procedure in order to exemplarily monitor the formation of phytosterol oxidation products. Quantification was performed using on-line LC-GC-FID, identification of the analytes was based on on-line LC-GC-MS. The developed approach offers a new possibility for the reliable and fast analysis of phytosterol oxidation products in enriched foods.
Collapse
Affiliation(s)
- Birgit Scholz
- Lehrstuhl für Allgemeine Lebensmitteltechnologie, Technische Universität München, Maximus-von-Imhof-Forum 2, D-85350 Freising, Germany
| | - Stefan Wocheslander
- Lehrstuhl für Allgemeine Lebensmitteltechnologie, Technische Universität München, Maximus-von-Imhof-Forum 2, D-85350 Freising, Germany
| | - Vera Lander
- Bayerisches Landesamt für Gesundheit und Lebensmittelsicherheit, Veterinärstrasse 2, D-85764 Oberschleissheim, Germany
| | - Karl-Heinz Engel
- Lehrstuhl für Allgemeine Lebensmitteltechnologie, Technische Universität München, Maximus-von-Imhof-Forum 2, D-85350 Freising, Germany.
| |
Collapse
|
7
|
Qi D, Fei T, Sha Y, Wang L, Li G, Wu D, Liu B. A novel fully automated on-line coupled liquid chromatography-gas chromatography technique used for the determination of organochlorine pesticide residues in tobacco and tobacco products. J Chromatogr A 2014; 1374:273-277. [PMID: 25476689 DOI: 10.1016/j.chroma.2014.11.040] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2014] [Revised: 11/12/2014] [Accepted: 11/14/2014] [Indexed: 10/24/2022]
Abstract
In this study, a novel fully automated on-line coupled liquid chromatography-gas chromatography (LC-GC) technique was reported and applied for the determination of organochlorine pesticide residues (OCPs) in tobacco and tobacco products. Using a switching valve to isolate the capillary pre-column and the analytical column during the solvent evaporation period, the LC solvent can be completely removed and prevented from reaching the GC column and the detector. The established method was used to determinate the OCPs in tobacco samples. By using Florisil SPE column and employing GPC technique, polarity impurities and large molecule impurities were removed. A dynamic range 1-100ng/mL was achieved with detection limits from 1.5 to 3.3μg/kg. The method exhibited good repeatability and recoveries. This technology may provide an alternative way for trace analysis of complex samples.
Collapse
Affiliation(s)
- Dawei Qi
- Technical Center of Shanghai Tobacco Group Co. Ltd., Shanghai 200082, China
| | - Ting Fei
- Technical Center of Shanghai Tobacco Group Co. Ltd., Shanghai 200082, China
| | - Yunfei Sha
- Technical Center of Shanghai Tobacco Group Co. Ltd., Shanghai 200082, China.
| | - Leijun Wang
- Technical Center of Shanghai Tobacco Group Co. Ltd., Shanghai 200082, China
| | - Gang Li
- Technical Center of Shanghai Tobacco Group Co. Ltd., Shanghai 200082, China
| | - Da Wu
- Technical Center of Shanghai Tobacco Group Co. Ltd., Shanghai 200082, China
| | - Baizhan Liu
- Technical Center of Shanghai Tobacco Group Co. Ltd., Shanghai 200082, China.
| |
Collapse
|
8
|
Aragón Á, Toledano RM, Gea S, Cortés JM, Vázquez AM, Villén J. Large volume injection in gas chromatography using the through oven transfer adsorption desorption interface operating under vacuum. Talanta 2014; 123:39-44. [PMID: 24725862 DOI: 10.1016/j.talanta.2014.01.064] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Revised: 01/24/2014] [Accepted: 01/29/2014] [Indexed: 11/29/2022]
Abstract
The present work describes a modification of the Through Oven Transfer Adsorption Desorption (TOTAD) interface, consisting of coupling a vacuum system to reduce the consumption of the helium needed to totally remove the eluent for large volume injection (LVI) in gas chromatography (GC). Two different retention materials in the liner of the TOTAD interface were evaluated: Tenax TA, which was seen to be unsuitable for working under vacuum conditions, and polydimethylsiloxane (PDMS), which provided satisfactory repeatability as well as a good sensitivity. No variability was observed in the retention times in either case. Solutions containing organophosphorous pesticides in two different solvents, a polar (methanol/water) and a non-polar (hexane) solvent, were used to evaluate the modification. The vacuum system coupled to the TOTAD interface allowed up to 90% helium to be saved without affecting the performance.
Collapse
Affiliation(s)
- Álvaro Aragón
- Escuela Técnica Superior de Ingenieros Agrónomos, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071 Albacete, Spain
| | - Rosa M Toledano
- Escuela Técnica Superior de Ingenieros Agrónomos, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071 Albacete, Spain
| | - Sara Gea
- Escuela Técnica Superior de Ingenieros Agrónomos, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071 Albacete, Spain
| | - José M Cortés
- Escuela Técnica Superior de Ingenieros Agrónomos, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071 Albacete, Spain.
| | - Ana M Vázquez
- Facultad de Educación, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071 Albacete, Spain
| | - Jesús Villén
- Escuela Técnica Superior de Ingenieros Agrónomos, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071 Albacete, Spain
| |
Collapse
|
9
|
Using offline HPLC-GC-FID 4-Desmethylsterols Concentration Profiles, Combined with Chemometric Tools, to Discriminate Different Vegetable Oils. FOOD ANAL METHOD 2013. [DOI: 10.1007/s12161-013-9773-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
10
|
Esche R, Scholz B, Engel KH. Online LC-GC analysis of free sterols/stanols and intact steryl/stanyl esters in cereals. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:10932-10939. [PMID: 24117337 DOI: 10.1021/jf403046z] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The suitability of online liquid chromatography-gas chromatography for the analysis of free sterols/stanols, steryl/stanyl fatty acid esters, and trans-steryl/stanyl ferulic acid esters in cereals is demonstrated. The silylated lipid extracts were fractionated via liquid chromatography on a normal phase, and the fractions containing the sterol classes were transferred online to the gas chromatograph for the analysis of their individual compositions. The study provides for the first time data on free sterols/stanols and intact steryl/stanyl esters in sweet corn, popcorn, and proso millet. Sweet corn revealed the highest contents of free sterols/stanols and steryl/stanyl fatty acid esters, and popcorn, in turn, the highest amounts of trans-steryl/stanyl ferulic acid esters. The distribution patterns of the proso millet samples revealed pronounced differences from those of sweet corn and popcorn as they particularly exhibited high proportions of free cholesterol and cholesteryl fatty acid esters. Furthermore, no trans-steryl/stanyl ferulic acid esters could be detected.
Collapse
Affiliation(s)
- Rebecca Esche
- Lehrstuhl für Allgemeine Lebensmitteltechnologie, Technische Universität München , Maximus-von-Imhof-Forum 2, D-85350 Freising, Germany
| | | | | |
Collapse
|
11
|
Wang Q, Ma L, Yin CR, Xu L. Developments in injection port derivatization. J Chromatogr A 2013; 1296:25-35. [DOI: 10.1016/j.chroma.2013.04.036] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Revised: 04/15/2013] [Accepted: 04/15/2013] [Indexed: 10/26/2022]
|