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http://dx.doi.org/10.11002/kjfp.2015.22.4.505

Determine the effects of drying temperature on the quality change and antioxidant activity characteristics of blueberry  

Shin, Dong-Sun (Petitami R&D)
Yoo, Yeon-Mi (National Academy of Agricultural Science, Rural Development Adminstration)
Kim, Ha-Yun (National Academy of Agricultural Science, Rural Development Adminstration)
Han, Gwi-Jung (National Academy of Agricultural Science, Rural Development Adminstration)
Publication Information
Food Science and Preservation / v.22, no.4, 2015 , pp. 505-511 More about this Journal
Abstract
This study was performed to investigate the effect of drying temperature on the quality characteristics and antioxidant activity of blueberry. Blueberries were dried at different times and temperatures, including A ($40^{\circ}C$, 72 hr), B ($40^{\circ}C$, 48 h and $50^{\circ}C$, 24 hr), C ($50^{\circ}C$, 72 hr), and D ($60^{\circ}C$, 72 hr). The yield and pH ranges of blueberry were determined to be 17.73~31.17% and 3.20~3.25, respectively. The yield rate of A treatments, soluble solid of D treatments, was the highest. The yield rate and soluble content was the highest in the treatment of A and D, respectively. The moisture content and water activity were significantly decreased with the increase in drying temperature (p<0.05). The L value of A treatment, and a and b values of D treatment were the greatest. In the analysis of texture analyzer, hardness, springiness, cohesiveness, gummiess and chewiness were significantly increased with the increase in drying temperature (p<0.05). In the sensory evaluation of blueberry, the appearance and color were the highest in the A treatment. The moisture, texture and taste was highest in the B treatment. The overall acceptability was in the order of B > A > C >D. The total polyphenol content and DPPH radical-scavenging activity were 9.21~13.05 mg/GAEg and 61.90~81.42%, respectively, which were significantly decreased with the increase in drying temperature (p<0.05). Therefore, the optimum time and temperature for blueberry drying was founded to be B treatment ($40^{\circ}C$, 48 hr and $50^{\circ}C$, 24 hr) among other treatments.
Keywords
blueberry; quality change; antioxidant activity;
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Times Cited By KSCI : 16  (Citation Analysis)
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