Date of Award
Doctor of Philosophy
Food Science and Human Nutrition
Dennis G. Olson
The distillation 2-thiobarbituric acid (TBA) test for meat lipid oxidation assessment was investigated in the presence of sodium tripolyphosphate (STPP) utilizing alternate wavelengths and TBA solvents;Malonaldialdehyde, hexanal and 2,4-hexadienal were reacted with 2-thiobarbituric acid (TBA) using water or 90% glacial acetic acid, and monitored at 532nm, 495nm and 455nm. Malondialdehyde absorbances increased linearly with concentration at both 532nm and 495nm. Hexanal and 2,4-hexadienal absorbances increased at all three wavelengths with concentration. Hexanal absorbance predominated at 455nm; acid-based 2,4-hexadienal absorbed greatest at 495nm whereas 532nm was the dominant water-based wavelength;STPP interference on the distillation TBA method was assessed during 14 days refrigerated storage (1°C) of raw and cooked comminuted pork. After selected periods, pork samples and levels of STPP (0%, 0.01%, 0.05%, 0.10%, 0.15%, 0.25%, 0.35%, 0.50%) were blended prior to distillation. Water as the TBA solvent yielded higher TBA reactive substances (TBARS) at all three wavelengths (P 0.05) on TBARS at 532nm, 495nm or 455nm for raw pork, but demonstrated a significant (P 0.05). Cooking caused significant increases in TBARS formation (P 0.10% was required; at 0.10%-0.35%, linear decreases in TBARS absorbance required logarithmic STPP increases.
Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/
Michael Paul Wanous
Wanous, Michael Paul, "Analysis of meat lipid oxidation with examination of polyphosphate interaction " (1991). Retrospective Theses and Dissertations. 9786.