1. Ahn SC, Kim MS, Lee SY, Kang JH, Kim BH, Oh WK, et al. Increase of bioactive flavonoid aglycone extractable from Korean citrus peel by carbohydrate-hydrolysing enzymes. Korean J Microbiol Biotechnol. 2005. 33:288-294.
2. Bergmeyer HU, Gacoehm K, Grassl M. In: Bergmeyer HU, editor. Methods of Enzymatic Analysis. Vol. 2. Academic Press, New York, NY, USA. 1974. p 428-429.
3. Cha JY, Cho YS. Biofunctional activities of citrus flavonoids. J Korean Soc Agric Chem Biotechnol. 2001. 44:122-128.
4. Estimation of total flavonoid content in propolis by two complementary colometric methods
5. Cho WD, Yoo KW. Preparation of onion hydrolysate for usage of sauce. J Korean Soc Food Nutr. 1997. 26:1147-1151.