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KMID : 1024420160200020111
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Food Engineering Progress
2016 Volume.20 No. 2 p.111 ~ p.119
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Effect of Packaging, Freezing, and Thawing Methods on the Quality Properties of Sweet Potato Stem
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Choi Hee-Jeong
Lee Sang-Yoon
Lee Ji-Seon
Seo Jae-Hee
Lee Jung-Gyu
Kim Ha-Yun
Shin Hye-Rim
Cho Sun-Kyung
Shin Min-Jung
Choi Mi-Jung
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Abstract
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Food freezing preservation is an important process due to its high quality and long shelf-life. In order to improve the quality of frozen sweet potato stem, the freezing rate, thawing, and packaging method was optimized by the determination of physical properties. There was no significant difference among the treatment of freezing rate. Further, the drip loss of sweet potato stem was higher at a relatively fast freezing rate (immersion freezing) than at slow freezing rate (natural convection freezing at -20 or -40°C). For the comparison of packaging methods, the aircontaining packaged sweet potato stem had the lowest significant differences from the result of color, pH, and hardness. From the result of the drip loss, the high frequency and microwave using thawing samples were more effective than room temperature and water thawing. Therefore, fast freezing and thawing rate with air-containing package were recommended to obtain the better quality of sweet potato stem.
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KEYWORD
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sweet potato stem, air containing package, immersion freezing, high frequency thawing, microwave thawing
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