نتایج جستجو برای: MCPD analysis

تعداد نتایج: 2824200  

2011
Troy D. Haines Kevin J. Adlaf Robert M. Pierceall Inmok Lee Padmesh Venkitasubramanian Mark W. Collison

Analysis of MCPD esters and glycidyl esters in vegetable oils using the indirect method proposed by the DGF gave inconsistent results when salting out conditions were varied. Subsequent investigation showed that the method was destroying and reforming MCPD during the analysis. An LC time of flight MS method was developed for direct analysis of both MCPD esters and glycidyl esters in vegetable o...

Journal: :Journal of oleo science 2016
Kazuo Koyama Kinuko Miyazaki Kousuke Abe Yoshitsugu Egawa Hirotsugu Kido Tadashi Kitta Takashi Miyashita Toru Nezu Hidenori Nohara Takashi Sano Yukinari Takahashi Hideji Taniguchi Hiroshi Yada Kumiko Yamazaki Yomi Watanabe

A collaborative study was conducted to evaluate an indirect enzymatic method for the analysis of fatty acid esters of 3-monochloro-1,2-propanediol (3-MCPD), 2-monochloro-1,3-propanediol (2-MCPD), and glycidol (Gly) in edible oils and fats. The method is characterized by the use of Candida rugosa lipase, which hydrolyzes the esters at room temperature in 30 min. Hydrolysis and bromination steps ...

Journal: :Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment 2008
Z Zelinková O Novotný J Schůrek J Velísek J Hajslová M Dolezal

A series of twelve breast milk samples were analysed by gas chromatography-mass spectrometry (GC/MS) operated in selected ion monitoring mode for 3-chloropropane-1,2-diol (3-MCPD). Whilst none of the samples contained 3-MCPD above the limit of detection of 3 microg kg(-1) milk, all contained high amounts of 3-MCPD esterified with higher fatty acids. The levels of 3-MCPD released by hydrolysis o...

Journal: :Se pu = Chinese journal of chromatography 2013
Xiaomin Xu Huali He Yudi Ruan Baifen Huang Jingshun Zhang Zengxuan Cai Yiping Ren

A simultaneous determination method for ethyl carbamate (EC) and chloropropanols (3-monochloropropane-1, 2-diol (3-MCPD) and 2-monochloropropane-1, 3-diol (2-MCPD)) in flavorings was developed by gas chromatography-triple quadrupole tandem mass spectrometry (GC-MS/MS). After spiked with internal standard, the sample was extracted by matrix solid-phase dispersion extraction technique with an Ext...

2017
Thierry A. Mara Noura Fajraoui Anis Younes Frederick Delay

We introduce the concept of Maximal Conditional Posterior Distribution (MCPD) to assess the uncertainty of model parameters in a Bayesian framework. Although, Markov Chains Monte Carlo (MCMC) methods are particularly suited for this task, they become challenging with highly parameterized nonlinear models. The MCPD represents the conditional probability distribution function of a given parameter...

Journal: :Journal of oleo science 2015
Kazuo Koyama Kinuko Miyazaki Kousuke Abe Keiich Ikuta Yoshitsugu Egawa Tadashi Kitta Hirotsugu Kido Takashi Sano Yukinari Takahashi Toru Nezu Hidenori Nohara Takashi Miyashita Hiroshi Yada Kumiko Yamazaki Yomi Watanabe

We developed a novel, indirect enzymatic method for the analysis of fatty acid esters of 3-monochloro-1,2-propanediol (3-MCPD), 2-monochloro-1,3-propanediol (2-MCPD), and glycidol (Gly) in edible oils and fats. Using this method, the ester analytes were rapidly cleavaged by Candida rugosa lipase at room temperature for 0.5 h. As a result of the simultaneous hydrolysis and bromination steps, 3-M...

Journal: :Journal of oleo science 2017
Kinuko Miyazaki Kazuo Koyama

The enzymatic indirect method for simultaneous determinations of 3-chloro-1, 2-propanediol fatty acid esters (3-MCPD-Es) and glycidyl fatty acid esters (Gly-Es) make use of lipase from Candida cylindracea (previously referred to as C. rugosa). Because of low substrate specificity of the lipase for esters of polyunsaturated fatty acids (PUFA), such as docosahexaenoic acid (DHA) and eicosapentaen...

2015
Wooseok Kim Yun A Jeong Jiwon On Ari Choi Jee-yeon Lee Joon Goo Lee Kwang-Geun Lee Heesoo Pyo

3-Monochloro-1,2-propanediol (3-MCPD) and 1,3-dichloro-2-propanol (1,3-DCP) are not only produced in the manufacturing process of foodstuffs such as hydrolyzed vegetable proteins and soy sauce but are also formed by heat processing in the presence of fat and low water activity. 3-MCPD exists both in free and ester forms, and the ester form has been also detected in various foods. Free 3-MCPD an...

2017

Esters of 2 and 3-monochloropropane-1,2-diol (MCPD) and glycidol esters are important contaminants of processed edible oils used as foods or food ingredients. This review describes the occurrence and analysis of MCPD esters and glycidol esters in vegetable oils and some other foods. The focus is on the analytical methods based on both direct and indirect methods. Methods of analysis applied to ...

Journal: :Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment 2013
C Crews A Chiodini M Granvogl C Hamlet K Hrnčiřík J Kuhlmann A Lampen G Scholz R Weisshaar T Wenzl P R Jasti W Seefelder

Esters of 2 - and 3-monochloropropane-1,2-diol (MCPD) and glycidol esters are important contaminants of processed edible oils used as foods or food ingredients. This review describes the occurrence and analysis of MCPD esters and glycidol esters in vegetable oils and some other foods. The focus is on the analytical methods based on both direct and indirect methods. Methods of analysis applied t...

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