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Evaluation of the Oxidative Stability of Diacylglycerol‐Enriched Soybean Oil and Palm Olein Under Rancimat‐Accelerated Oxidation Conditions
Author(s) -
Wang Yong,
Zhao Mouming,
Tang Shuze,
Song Keke,
Han Xue,
Ou Shiyi
Publication year - 2010
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/s11746-009-1521-1
Subject(s) - chemistry , diacylglycerol kinase , ascorbyl palmitate , soybean oil , food science , oxidative phosphorylation , hydrolysis , palm oil , lipid oxidation , antioxidant , biochemistry , chromatography , enzyme , protein kinase c
The oxidative stability of diacylglycerol (DAG)‐enriched soybean oil and palm olein produced by partial hydrolysis using phospholipase A1 (Lecitase Ultra) and molecular distillation was investigated at 110 °C by the Rancimat method with and without addition of synthetic antioxidants. Compared with triacylglycerol oils, the DAG‐enriched oils displayed lower oxidative stability due to a higher content of unsaturated fatty acids and a lower level of tocopherols. With the addition (50–200 mg/kg) of tert ‐butylhydroquinone (TBHQ) or ascorbyl palmitate (AP), the oxidative stability indicated by induction period (IP) of these DAG‐enriched oils under the Rancimat conditions was improved. The IP of the diacylglycerol‐enriched soybean oil increased from 4.21 ± 0.09 to 12.64 ± 0.42 h when 200 mg/kg of TBHQ was added, whereas the IP of the diacylglycerol‐enriched palm olein increased from 5.35 ± 0.21 to 16.24 ± 0.55 h when the same level of AP was added. Addition of TBHQ, alone and in combination with AP resulted in a significant ( p ≤ 0.05) increase in oxidative stability of diacylglycerol‐enriched soybean oil. AP had a positive synergistic effect when used with TBHQ.