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The Effect of Bulking Agent on Quality of Kiwifruit Powder in the Process of Domestic Kiwifruit Tenderizer  

Roh, Jeong-Hae (Korea Food Research Institute)
Kim, Young-Boong (Korea Food Research Institute)
Kil, Bok-Im (Department of Food and Nutrition, Anyang University)
Publication Information
Korean Journal of Food Science and Technology / v.34, no.5, 2002 , pp. 805-810 More about this Journal
Abstract
Development of tenderizer using domestic fruits was studied. Kiwifruit was dried using various methods, and the quality of kiwifruit powder was observed during 12 week storage. Frozen kiwifruit was prepared in paste, dice, and whole flesh. After drying, paste-type kiwifruit showed 2.0 and 1.3 times higher proteolytic activity than dice and whole flesh kiwifruits, respectively. Nine hour of hot-air drying or 46 h of freeze-drying eliminated more than 90% of water from kiwifruit, during which discoloring of kiwifruit occurred. Freeze-dried powder showed 6.6 times higher yield and proteolytic activity, and resulted in almost no discolorization than those of air-dried powder. Addition of bulking agent affected the quality of hot air-dried kiwifruit powder, except color, resulting in $3.2{\sim}3.6$ times higher proteolytic activity than that without bulking agent, which is comparable to 60% of the initial freeze-dried powder content. Moisture content of kiwifruit powder with bulking agent sustained consistently during 12 week storage, whereas proteolytic activity decreased for the first 4 weeks. Freeze-drying is a preferable method to produce kiwifruit powder for tenderizer, although hot air-drying with bulking agent treatment is more economical.
Keywords
domestic kiwifruit; drying methods; proteolytic activity; bulking agent; meat tenderizer;
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