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A Visual Titration Method for the Determination of the Acid Number of Oils and Fats: a Green Alternative
Author(s) -
Aricetti J. A.,
Tubino M.
Publication year - 2012
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-012-2111-1
Subject(s) - titration , chromatography , phenolphthalein , chemistry , canola , sunflower , relative standard deviation , rapeseed , linear regression , mathematics , food science , detection limit , organic chemistry , statistics , combinatorics
A visual and green titrimetric method is proposed for the determination of the acid number of oils and fats. The sample is dissolved in a water–ethanol mixture (1:1 v/v) and titrated with a 0.02 mol L −1 aqueous NaOH solution. Phenolphthalein is used as acid‐basic indicator. Oils of canola, sunflower, linseed, castor, corn and soy as well as swine lard, a total of twelve real samples, were analyzed. The results obtained were compared with those from the application of the AOCS Cd 3d‐63 method, through a statistical linear regression procedure at the 95 % confidence level and no evidence for systematic differences between the two sets of results was observed. The mean RSD (relative standard deviation) for the proposed procedure is 4.8 %, whereas that of the official method was found to be 5.4 %.