Title page for ETD etd-12042003-114730


Type of Document Master's Thesis
Author Greene, Donna Mechelle
Author's Email Address dgreene3@vt.edu
URN etd-12042003-114730
Title Use of Poultry Collagen Coating and Antioxidants as Flavor Protection for Cat Foods Made with Rendered Poultry Fat
Degree Master of Science
Department Food Science and Technology
Advisory Committee
Advisor Name Title
O'Keefe, Sean F. Committee Chair
Alvarado, Christine Z. Committee Member
Duncan, Susan E. Committee Member
Keywords
  • oxidation
  • cat food
  • poultry by-products
  • TBARS
Date of Defense 2003-11-20
Availability unrestricted
Abstract
Poultry skins and rendered poultry fat are by-products produced in excess at rendering plants. The use of low value by-products such as poultry collagen, from poultry skins, and fat to improve flavor and quality in dry pet food could be economically attractive. This study examined a poultry collagen coating as a protective barrier against oxidation in dry cat food made with rendered poultry fat. Collagen was extracted from chicken skins, dissolved in an acidic solution, applied to dry cat food and dried to form a surface film. Six treatments were examined: kibble, kibble with fat, kibble with collagen, kibble with fat and collagen, kibble with fat, BHA/BHT and collagen and kibble with fat, tocopherol and collagen. There were two storage conditions: 'jungle condition' (42°C and 83% relative humidity) and 'ambient condition' (21°C and 51% relative humidity). In 'jungle conditions', thiobarbituric acid reactive substances (TBARS) was measured over an eight-day period at day 0, 2, 4, 6, and 8. In 'ambient conditions', TBARS was measured over a thirty-day period at day 0, 7, 14, 21, and 30. Water activity and moisture contents were measured. There were significantly higher TBARS (P<0.05) for the control kibble at both storage conditions. There was significantly higher fat percentage (P<0.05) in all treatments with the additional fat coatings. Fatty acid compositions showed slight changes during storage. There were some changes in the aroma profile of the kibble with fat treatment having musty, moldy and plastic aromas at both storage conditions. The volatile aromas might be an indication of oxidation in the poultry fat.

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