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http://dx.doi.org/10.11002/kjfp.2016.23.5.654

Quality characteristics of Pueraria thunbergiana extracts depending on drying methods  

Kwon, Yu-Ri (Department of Food Science and Technology, Catholic University of Daegu)
Nam, San (Department of Food Science and Technology, Catholic University of Daegu)
Jeong, Da Som (Department of Food Science and Technology, Catholic University of Daegu)
Kwon, Ri Eun (Department of Food Science and Technology, Catholic University of Daegu)
Youn, Kwang-Sup (Department of Food Science and Technology, Catholic University of Daegu)
Publication Information
Food Science and Preservation / v.23, no.5, 2016 , pp. 654-659 More about this Journal
Abstract
This study was designed to compare the quality characteristics of spray-dried (SD) and freeze-dried (FD) Pueraria thunbergiana extracts powder hot water extracts. Quality characteristics of the SD and FD powder including moisture content, color value, water absorption index, water solubility index, dynamic angle and antioxidant activities were evaluated. The moisture content of SD powder (1.50%) was lower than that of FD powder (2.92%). $L^*$ and $b^*$ values of SD powder was lower than of FD powder. The water absorption index was higher in FD powder (1.40) and water solubility index in SD powder (94.10%) was higher than that FD powder (90.69%). Dynamic angle of SD powder ($36.46^{\circ}$) was higher than that of FD powder ($33.30^{\circ}$). The DPPH radical scavenging activities of 5 mg/mL solution of SD powder and FD powder were 85.38 mg/mL, 59.38 mg/mL, respectively. And, the same trend was observed for the ABTS radical scavenging activities of the drying powder as that observed for their DPPH radical scavenging activities. There were relatively higher contents of phenolic compounds in SD powders than in FD powders. In conclusion, spray-dried Pueraria thunbergiana extracts showed the high WSI, polyphenol, DPPH and ABTS radical scavenging activities and low moisture content and dynamic angle than freeze dried powder.
Keywords
Pueraria thunbergiana; quality characteristics; drying method; spray drying; freeze drying;
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Times Cited By KSCI : 7  (Citation Analysis)
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