Acidity of oryzanol and its contribution to free fatty acids value in vegetable oils

2006 ◽  
Vol 83 (12) ◽  
pp. 999-1005 ◽  
Author(s):  
A. G. Gopala Krishna ◽  
K. H. Hemakumar ◽  
Sakina Khatoon
Keyword(s):  
Fatty Acids ◽  
Free Fatty Acids ◽  
Vegetable Oils

Correlation between free fatty acids of vegetable oils evaluated by rapid tests and by the official method

2007 ◽  
Vol 20 (6) ◽  
pp. 523-528 ◽  
Author(s):  
Cibele Cristina Osawa ◽  
Lireny Aparecida Guaraldo Gonçalves ◽  
Sidnei Ragazzi
Keyword(s):  
Fatty Acids ◽  
Free Fatty Acids ◽  
Vegetable Oils ◽  
Official Method ◽  
Rapid Tests

scholarly journals NMR Determination of Free Fatty Acids in Vegetable Oils

Processes ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 410 ◽  
Author(s):  
Maria Enrica Di Pietro ◽  
Alberto Mannu ◽  
Andrea Mele
Keyword(s):  
Fatty Acids ◽  
Free Fatty Acids ◽  
Vegetable Oils ◽  
31P Nmr ◽  
Waste Cooking Oils ◽  
Pros And Cons ◽  
Application Fields ◽  
Cooking Oils ◽  
13C And 31P Nmr

The identification and quantification of free fatty acids (FFA) in edible and non-edible vegetable oils, including waste cooking oils, is a crucial index to assess their quality and drives their use in different application fields. NMR spectroscopy represents an alternative tool to conventional methods for the determination of FFA content, providing us with interesting advantages. Here the approaches reported in the literature based on 1H, 13C and 31P NMR are illustrated and compared, highlighting the pros and cons of the suggested strategies.

The heterogeneous catalyst system for the continuous conversion of free fatty acids in used vegetable oils for the production of biodiesel

2008 ◽  
Vol 131 (1-4) ◽  
pp. 238-243 ◽  
Author(s):  
Young-Moo Park ◽  
Dae-Won Lee ◽  
Deog-Keun Kim ◽  
Jin-Suck Lee ◽  
Kwan-Young Lee
Keyword(s):  
Fatty Acids ◽  
Free Fatty Acids ◽  
Heterogeneous Catalyst ◽  
Vegetable Oils ◽  
Catalyst System

scholarly journals pH-Metric Determination of the Acid Value of Vegetable Oils without Titration

1998 ◽  
Vol 81 (4) ◽  
pp. 873-879 ◽  
Author(s):  
Ilya Kuselman ◽  
Yakov I Tur’yan ◽  
Oleg Y Berezin ◽  
Lina Kogan ◽  
Avinoam Shenhar
Keyword(s):  
Fatty Acids ◽  
Quality Control ◽  
Free Fatty Acids ◽  
Vegetable Oils ◽  
Isopropyl Alcohol ◽  
Acid Value ◽  
Standard Acid ◽  
Initial Ph ◽  
The Difference

Abstract The acid value (AV) of vegetable oils is determined without titration by using a new reagent consisting of triethanolamine in a solution of water and isopropyl alcohol. When the oil sample is mixed with the reagent in the pH-metric cell, free fatty acids from the sample are extracted into the reagent ( 3 - 4 min). The initial pH, called conditional pH´, is measured, a standard acid (HC1) is added, and the final pH, pH´2, is measured. AV is calculated from the difference between pH´! and pH´2. The method is applicable for quality control of vegetable oils during their production, trade, and use

A new zinc hydroxide nitrate heterogeneous catalyst for the esterification of free fatty acids and the transesterification of vegetable oils

2008 ◽  
Vol 9 (11-12) ◽  
pp. 2140-2143 ◽  
Author(s):  
Claudiney Soares Cordeiro ◽  
Gregorio Guadalupe Carbajal Arizaga ◽  
Luiz Pereira Ramos ◽  
Fernando Wypych
Keyword(s):  
Fatty Acids ◽  
Free Fatty Acids ◽  
Heterogeneous Catalyst ◽  
Vegetable Oils ◽  
Zinc Hydroxide ◽  
Zinc Hydroxide Nitrate
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