β-胡萝卜素对Pickering乳液中脂质氧化的抑制作用研究OA北大核心CSTPCD

In order to investigate the inhibitory effect of β-carotene on lipid oxidation in Pickering emulsion,the Pickering emulsions embedded with β-carotene were prepared using cellulose nanocrystal(CNC)as an emulsifier.The DPPH and ABTS+radical scavenging rates were used as evaluation indices to examine the antioxidant properties of β-carotene,both before and after embedding.The oxidative and coloring stability of the embedded β-carotene emulsions was investigated by measuring the β-carotene embedding and retention rate,peroxide value(POV),thiobarbituric acid(TBA)value,and color difference.The results showed that the β-carotene embedded in the emulsions had a good scavenging effect on DPPH and ABTS+free radicals.The retention of β-carotene in the emulsions significantly decreased(P＜0.05)due to the free radical scavenging and auto-oxidation reactions of β-carotene.There was a highly significant negative correlation between the retention of β-carotene and the TBA value in the emulsions(P＜0.01).During the accelerated oxidation,the peroxide value(POV)and thiobarbituric acid(TBA)value in the emulsions decreased significantly with increasing β-carotene concentration(P＜0.05),and the oxidative stability of the emulsions was significantly improved.This result was because theβ-carotene in the emulsion inhibited lipid oxidation by scavenging free radical and auto-oxidation reaction.The color saturation of the embedded β-carotene emulsions significantly increased(P＜0.05),and the emulsions had a bright yellow color.Therefore,the oxidative and coloring stability of Pickering emulsions can be enhanced by embedding fat-soluble β-carotene into the emulsions.This advancement broadens the potential applications of Pickering emulsions in fat substitution,nutrient embedding,and nutrient delivery areas.