Abedin, M. Z. and Riemschneider, R. (1984) Chicken skin collagen-molecular diversity and susceptibility to neutral proteinases. Pharm. Ind. 46, 532-535.
AOAC. (2000) Official methods of analysis of AOAC Int1. 17th ed. Associations of Official Analytical Chemists, USA.
Asghar, A. and Henrickson, R. L. (1982) Chemical, biochemical and nutritional characteristics of collagen in food systems. Adv. Food Res. 28, 231-372.
Bailey, A. J. and Paul, R. G. (1998) Collagen-is not so simple protein. J. Soc. Leather Technol. Chem. 82, 104-110.
Bannister, D. W. and Burns, A. B. (1972) Pepsin treatment of avian skin collagen. Effects on solubility, subunit composition and aggregation properties. Biochem. J. 129, 677-681.
Bonifer, L. J. and Froning, G. W. (1996) Chicken skin composition as affected by aqueous washings. J. Food Sci. 61, 895-898.
Cao, H. and Xu, S. Y. (2008) Purification and characterization of type II collagen from chick sterna cartilage. Food Chem. 108, 439-445.
Cho, S. M., Gu, Y. S., and Kim, S. B. (2005) Extracting optimization and physical properties of yellowfin tuna (Thunnus albacares) skin gelatin compared to mammalian gelatins. Food Hydrocol. 19, 221-229.
Choi, Y. S., Choi, J. H., Han, D. J., Kim, H. Y., Lee, M. A., Kim, H. W., Jeong, J. Y., and Kim, C. J. (2011) Effects of rice bran fiber on heat-induced gel prepared with pork salt-soluble meat proteins in model system. Meat Sci. 88, 59-66.
Cliche, S., Amiot, J., Averzard, C., and Gariepy, C. (2003) Extraction and characterization of collagen with or without telopeptides from chicken skins. Poultry Sci. 82, 503-509.
Divakaran, S. (1984) Handbook of mammalian collagen and gelatin. Biochem. 61, 589-585.
Gomez-Guillen, M. C., Gilmenez, B., Lopez-Caballero, M. E., and Montero, M. P. (2011) Functional and bioactive properties of collagen and gelatin from alternative sources: A review. Food Hydrocol. 25, 1813-1827.
Gudmundsson, M. (2002) Rheological properties of fish gelatins. J. Food Sci. 67, 2172-2176.
Jang, E. G., Lim, J., and Kim, K. O. (2002) Effect of soaking condition on the physicochemical properties of chicken feet gelatin. Korean J. Food Sci. Technol. 34, 425-430.
Johnston-Banks, F. A. (1990) Gelatin. In: Food Gels. Harris, P. (ed) Elsevier Applied Food Science Series, London, pp. 223-289.
Kim, C. J., Kim, K. H., and Choe, B. K. (1988) Effect of pH, swelling temperature, swelling time and various acids on the yields and physicochemical properties of pigskin gelatin gel. Korean J. Anim. Sci. 30, 301-306.
Kim, J. W., Kim, D. K., Kim, M. J., and Kim, S. D. (2010) Extraction and bleaching of acid- and pepsin-soluble collagens from shark skin and muscle. Korean J. Food Preserv. 17, 91-99.
Laemmli, U. K. (1970) Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Nature 227, 680-685.
Lim, J., O, S., and Kim, K. O. (2001) The effects of processing conditions on the properties of chicken feet gelatin. Food Sci. Biotechnol. 10, 638-645.
Lim, J., Shin, W. S., Lee, H. G., and Kim, K. O. (2002) Optimizing extraction conditions for chicken feet gelatin. Korean J. Food Sci. Technol. 34, 824-829.
Lin, Y. K. and Liu, D. C. (2006) Effects of pepsin digestion at different temperatures and times on properties of telopeptide- poor collagen from bird feet. Food Chem. 94, 621-625.
Nalinanon, S., Benjakul, S., Visessanguan, W., and Kishimura, H. (2008) Tuna pepsin: characteristics and its use for collagen extraction from the skin of threadfin bream (Nemipterus spp.). J. Food Sci. 73, C413-C419.
SAS. (2008) SAS/STAT Software for PC. Release 9.2, SAS Institute Inc., Cary, NC, USA.
Shin, M. H. (2002) Properties of collagen extracted from chicken foot skins. Korean J. Culinary Res. 8, 95-105.
Shon, J. and Eun, J. B. (2010) Physicochemical and functional properties of collagen powder from skate (Raja Kenojei) skins. Korean J. Food Preserv. 17, 435-443.
Yeom, G. W., Andrieu, J., and Min, S. G. (2004) Effect of acid treatment process on the physicochemical properties of gelatin extracted from pork skin. Korean J. Food Sci. Ani. Resour. 24, 266-272.