Adaptation of the AOCS official method for measuring hydroperoxides from small-scale oil samples

2001 ◽  
Vol 78 (12) ◽  
pp. 1267-1269 ◽  
Author(s):  
Tammy D. Crowe ◽  
Pamela J. White
Keyword(s):  
Small Scale ◽  
Official Method ◽  
Aocs Official ◽  
Aocs Official Method

scholarly journals Identification of a TBHQ-Interfering Peak in Crude Canola Oil Using AOCS Official Method Ce 6-86 and its Chromatographic Resolution

2017 ◽  
Vol 94 (10) ◽  
pp. 1323-1328
Author(s):  
Michael R. Blumhorst ◽  
Travis Mahan ◽  
Kathryn Stanley ◽  
Aaron Griffith ◽  
Mark W. Collison
Keyword(s):  
Canola Oil ◽  
Official Method ◽  
Aocs Official ◽  
Aocs Official Method ◽  
Chromatographic Resolution

scholarly journals Resolution Behavior of cis- and trans-Octadecenoic Acid Isomers by AOCS Official Method Using SP-2560 Column

2013 ◽  
Vol 62 (10) ◽  
pp. 781-788 ◽  
Author(s):  
Kazuaki Yoshinaga ◽  
Masaharu Asanuma ◽  
Chao Xu ◽  
Hoyo Mizobe ◽  
Koichi Kojima ◽  
...  
Keyword(s):  
Octadecenoic Acid ◽  
Official Method ◽  
Aocs Official ◽  
Aocs Official Method ◽  
Trans Octadecenoic Acid ◽  
Cis And Trans

scholarly journals Collaborative Study for the Quantification of Total Contents of 2- and 3-Monochloropropanediol and Glycidol in Food Emulsifiers by GC-MS

2021 ◽  
Author(s):  
Jan Kuhlmann
Keyword(s):  
Phenylboronic Acid ◽  
Collaborative Study ◽  
Fatty Acid Esters ◽  
Gas Chromatography Mass Spectrometry ◽  
Official Method ◽  
Data Sets ◽  
Aocs Official ◽  
Aocs Official Method ◽  
Bromide Solution ◽  
Food Emulsifiers

An international robin round was carried out to validate a method for the quantification of 2-monochloropropane-1,3-diol (2-MCPD), 3-monochloropropane-1,2-diol (3-MCPD) and 2,3-epoxy-1-propanol (Glycidol) being present as fatty acid esters in plant-based food emulsifiers. The evaluated method was a modification of the American Oil Chemist´s Society (AOCS) Official Method Cd29b-13. Briefly, this method consists from parallel analysis of two sample aliquots that are spiked with different sets of internal standards. Mild alkaline interesterification overnight in the freezer releases the core analytes. Reaction stop and glycidol conversion into monobromopropanediol (MBPD) is realised by addition of acidified sodium bromide solution. Subsequently, matrix removal and analyte extraction are achieved by two liquid/liquid (l/l) extraction steps. After derivatisation with phenylboronic acid (PBA) the final extracts are analysed by gas chromatography-mass spectrometry (GC-MS). Quantification is carried out by internal one-point-calibration. 6 laboratories from 4 European countries participated in the trial and reported 8 data sets for 10 test materials (mono- and diacylglycerides as well as polyglycerol polyricinoleates) that were analysed as blind duplicates, giving a total of 20 samples. Result outliers were eliminated according to accepted standards. At 2-MCPD levels above 0.02 mg/kg, 3-MCPD levels above 0.06 mg/kg and glycidol levels above 0.22 mg/kg repeatability (RSDr) ranged from 1.5 % to 24.9 %, reproducibility (RSDR) ranged from 7.8 % to 29.0 % and HORRATR-values ranged from 0.5 to 1.7. The tested method showed to be suitable for the determination of 2-MCPD, 3-MCPD and glycidol in food emulsifiers consisting from mono- and diacylglycerides as well as polyglycerol polyricinoleates.

scholarly journals Review of Methods for Preparation and Gas Chromatographic Separation of trans and cis Reference Fatty Acids

2009 ◽  
Vol 92 (5) ◽  
pp. 1310-1326 ◽  
Author(s):  
Pierluigi Delmonte ◽  
Ali-Reza Fardin Kia ◽  
Qing Hu ◽  
Jeanne I Rader
Keyword(s):  
Fatty Acid ◽  
Reference Materials ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Fats And Oils ◽  
Official Method ◽  
Experimental Conditions ◽  
Aocs Official ◽  
Aocs Official Method ◽  
Gas Chromatographic Separation

Abstract In recent years, several countries have implemented new regulations regarding the limitation or labeling of the trans fatty acid (TFA) content of foods and dietary supplements. GC methods for fatty acid (FA) analysis have been updated by improving the separation of TFAs from other FAs, especially trans- and cis-18:1, and by focusing more attention on the FAs contained in fats and oils in lower amounts. FA analysis is affected by the limited availability of reference materials. Identifications are frequently made simply by comparison with separations reported in the literature. This report describes the preparation of mixtures containing fatty acid methyl esters (FAMEs) that are not available as reference materials. These mixtures can be used for FAME identifications. The prepared mixtures are analyzed under the experimental conditions of the American Oil Chemists' Society (AOCS) Official Method Ce 1h-05 and AOCS Recommended Practice Ce 1j-07.

scholarly journals VALIDASI METODE ANALISIS ASAM LEMAK TRANS DALAM MAKANAN BERDASARKAN AOCS OFFICIAL METHOD Ce 1h-05

2016 ◽  
Vol 27 (1) ◽  
pp. 40-50
Author(s):  
Maria Fransisca Njoman ◽  
◽  
Nuri Andarwulan ◽  
◽  
Keyword(s):  
Official Method ◽  
Aocs Official ◽  
Aocs Official Method

Reasons to strike first

2019 ◽  
Vol 42 ◽  
Author(s):  
William Buckner ◽  
Luke Glowacki
Keyword(s):  
Intergroup Conflict ◽  
Small Scale

Abstract De Dreu and Gross predict that attackers will have more difficulty winning conflicts than defenders. As their analysis is presumed to capture the dynamics of decentralized conflict, we consider how their framework compares with ethnographic evidence from small-scale societies, as well as chimpanzee patterns of intergroup conflict. In these contexts, attackers have significantly more success in conflict than predicted by De Dreu and Gross's model. We discuss the possible reasons for this disparity.

Exploring Coronal Structures with SOHO

2000 ◽  
Vol 179 ◽  
pp. 403-406
Author(s):  
M. Karovska ◽  
B. Wood ◽  
J. Chen ◽  
J. Cook ◽  
R. Howard
Keyword(s):  
Solar Corona ◽  
Image Enhancement ◽  
Coronal Mass Ejections ◽  
Dynamical Evolution ◽  
Small Scale ◽  
Low Contrast ◽  
Contrast Structures ◽  
Scale Structures ◽  
Small Scale Structures ◽  
Coronal Structures

AbstractWe applied advanced image enhancement techniques to explore in detail the characteristics of the small-scale structures and/or the low contrast structures in several Coronal Mass Ejections (CMEs) observed by SOHO. We highlight here the results from our studies of the morphology and dynamical evolution of CME structures in the solar corona using two instruments on board SOHO: LASCO and EIT.

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