Oxidation and Colloidal Stability of Oil-in-Water Emulsion as Affected by Pigmented Rice Hull Extracts

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• 作者：Nopparat Cheetangdee ; Soottawat Benjakul
• 关键词：Pigmented rice hull ; Phenolic compounds ; Antioxidant activity ; Colloidal stability ; Tween 20 ; Bovine serum albumin ; Oil ; in ; water (O/W) emulsion
• 刊名：Journal of the American Oil Chemists' Society
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：93
• 期：4
• 页码：519-529
• 全文大小：1,371 KB
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• 作者单位：Nopparat Cheetangdee (1)
  Soottawat Benjakul (1)
  
  1. Department of Food Technology, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Industrial Chemistry and Chemical Engineering
  Analytical Chemistry
  Chemistry
  Biotechnology
  Biomaterials
  Agriculture
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1558-9331

文摘

Extracts from the hull of pigmented rice were prepared using a mixture of methanol–water (1:1, 2:1, and 3:1, v/v) for different extraction times (0–180 min). Total phenolic content (TPC) of the extracts increased with increasing concentration of methanol and extraction time (P < 0.05). A positive correlation between TPC and antioxidant activities, i.e., DPPH and ABTS radical scavenging activities and reducing power, was observed. The extracts prepared using methanol–water at the ratio of 3:1 for 180 min at 50 °C, referred as rice hull phenolic extract (RHPE), showed the highest TPC and free radical scavenging abilities and reducing power (P < 0.05). When the effects of RHPE on physicochemical stability of the emulsions stabilized by different emulsifiers, i.e., Tween 20 and bovine serum albumin (BSA), were examined, the collapse of emulsion was retarded when RHPE was applied in BSA-based emulsions, whereas a negative effect was noticeable in Tween 20-based counterpart. Lower oxidative degree was found for BSA stabilized emulsions, compared to Tween 20 containing system. RHPE (1–3 %) markedly improved the oxidative stability, particularly for BSA stabilized emulsions. Therefore, RHPE could be employed along with the selected protein to increase physicochemical stability of emulsion.