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Type: Artigo de periódico
Title: Acceleration of the thermoxidation of oil by heme iron
Author: Artz, WE
Osidacz, PC
Coscione, AR
Abstract: Transition metals, including iron, occur naturally at significant concentrations in meat. Iron can be extracted from the food into the oil and potentially decrease the stability of the oil during frying by accelerating thermoxidation. The objective was to examine the thermoxidative stability of partially hydrogenated soybean oil after addition of heme iron. Heme iron (2.7 ppm) was added to the oil, and then oil samples were heated continuously at 160, 180, or 200 degrees C for 72 h. Oil samples were removed for analysis every 12 h. The acid values, color, food oil sensor readings, and TAG polymer content of the heated oil samples were compared with oil samples containing no added iron that were held at the same temperatures. Generally, each oxidative index increased with (i) an increase in temperature, (ii) an increase in heating time, and/or (iii) the addition of iron. Generally, the extent of oxidation was greater for samples heated at 200 degrees C than for oil samples heated at 160 or 180 degrees C. The oil samples heated at 200 degrees C reached the target polymer content of 20% after 27 h of heating. If heme iron accumulates in the oil, it will increase the rate of oxidation and thermal degradation and reduce the frying life of the oil.
Subject: deep-fat frying
heme iron
oil stability
Country: EUA
Editor: Amer Oil Chemists Soc A O C S Press
Rights: fechado
Identifier DOI: 10.1007/s11746-005-1112-3
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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