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Effect of Ascorbic Acid or Acyl Ascorbate on the Stability of Catechin in Oil-In-Water Emulsion

  • Original Paper
  • Published:
Journal of the American Oil Chemists' Society

Abstract

The degradation of (+)-catechin in an oil-in-water emulsion using methyl dodecanate as an oil phase with or without ascorbic acid or acyl ascorbate was kinetically examined at 40 °C. The rate constant, k, of the first-order kinetics for the degradation with ascorbic acid or octanoyl ascorbate depended on the added amount, whereas the k value with hexadecanoyl ascorbate was independent of the amount. The k value for a smaller oil droplet with each ascorbate was lower than that for a larger oil droplet. Catechin did not partition well into the methyl dodecanate phase, but did adsorb slightly onto the interface between the methyl dodecanate and water. The suppressive effect of acyl ascorbate on the catechin degradation in the emulsion was lower than that of hydrophilic ascorbic acid at the low concentration, but the peroxidative ability also was lower. Most of the catechin molecules in the emulsion degraded in the water phase. The catechin degradation in the emulsion with small oil droplets depended on the acyl chain length of the ascorbates more than in large oil droplets.

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Acknowledgments

This work was supported by a Grant-in-Aid for Young Scientists (B) 19780106 from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.

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Authors and Affiliations

  1. Department of Biotechnology and Chemistry, Faculty of Engineering, Kinki University, 1 Takayaumenobe, Higashihiroshima, 739-2116, Japan

    Yoshiyuki Watanabe, Takahiro Suzuki, Hirofumi Nakanishi & Ayumi Sakuragochi

  2. Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan

    Shuji Adachi

Authors
  1. Yoshiyuki Watanabe
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  2. Takahiro Suzuki
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  3. Hirofumi Nakanishi
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  4. Ayumi Sakuragochi
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  5. Shuji Adachi
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Correspondence to Yoshiyuki Watanabe.

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Watanabe, Y., Suzuki, T., Nakanishi, H. et al. Effect of Ascorbic Acid or Acyl Ascorbate on the Stability of Catechin in Oil-In-Water Emulsion. J Am Oil Chem Soc 89, 269–274 (2012). https://doi.org/10.1007/s11746-011-1913-x

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  • DOI: https://doi.org/10.1007/s11746-011-1913-x

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