The aim of this study was to evaluate the presence of trans fatty acids (TFA) and conjugated linoleic acid (CLA) isomers in feeding fats obtained from waste or by-products of the food chain. Fat samples were classified in 10 categories, according to the origin of the raw material and/or the technology used for their production (acid oils from chemical refining, acid oils from physical refining, lecithins, recycled oils, animal fats, oils recovered from exhausted bleaching earths, fish oils, hydrogenated by-products, fatty acid calcium soaps and miscellaneous). Fats were first methylated with diazomethane, then transmethylated with 2N KOH/methanol and analyzed by GC and silver-ion TLC-GC. The total TFA content ranged from 0.1 g/100g fat to 8.3 g/100g fat. The maximum CLA content found was about 220 mg/100g fat. The level of TFA and CLA significantly varied among the feeding fat categories, which mainly depended on the nature and quality of raw materials, as well as on the technology and processing conditions used for their production. In general, the total TFA content of the analyzed fats was positively correlated to the total C18:1 trans isomers level.
G. Pignoli, M. Bonoli, M.T. Rodriguez-Estrada, G. Lercker. (2006). Presence of trans fatty acids (TFA) and conjugated linoleic acid (CLA) isomers in feeding fats obtained from waste or by-products of the food chain. FRANKFURT : Euro Fed Lipid.
Presence of trans fatty acids (TFA) and conjugated linoleic acid (CLA) isomers in feeding fats obtained from waste or by-products of the food chain
PIGNOLI, GIOVANNI;BONOLI, MATTEO;RODRIGUEZ ESTRADA, MARIA TERESA;LERCKER, GIOVANNI
2006
Abstract
The aim of this study was to evaluate the presence of trans fatty acids (TFA) and conjugated linoleic acid (CLA) isomers in feeding fats obtained from waste or by-products of the food chain. Fat samples were classified in 10 categories, according to the origin of the raw material and/or the technology used for their production (acid oils from chemical refining, acid oils from physical refining, lecithins, recycled oils, animal fats, oils recovered from exhausted bleaching earths, fish oils, hydrogenated by-products, fatty acid calcium soaps and miscellaneous). Fats were first methylated with diazomethane, then transmethylated with 2N KOH/methanol and analyzed by GC and silver-ion TLC-GC. The total TFA content ranged from 0.1 g/100g fat to 8.3 g/100g fat. The maximum CLA content found was about 220 mg/100g fat. The level of TFA and CLA significantly varied among the feeding fat categories, which mainly depended on the nature and quality of raw materials, as well as on the technology and processing conditions used for their production. In general, the total TFA content of the analyzed fats was positively correlated to the total C18:1 trans isomers level.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
