Effects of high-power ultrasound on microflora, enzymes and some quality attributes of a strawberry drink

被引:18
作者
Chen, Liyi [1 ]
Bi, Xiufang [1 ]
Cao, Xiamin [2 ]
Liu, Lei [1 ]
Che, Zhenming [1 ]
机构
[1] Xihua Univ, Sichuan Key Lab Food Biotechnol, Sch Food & Bioengn, Chengdu, Sichuan, Peoples R China
[2] Soochow Univ, Sch Biol & Basic Med Sci, Suzhou, Peoples R China
关键词
high-power ultrasound; strawberry drink; microflora; beta-glucosidase; color; SUPERCRITICAL CARBON-DIOXIDE; HIGH HYDROSTATIC-PRESSURE; EMERGING TECHNOLOGIES; PECTIN METHYLESTERASE; VITAMIN-C; SONICATION; ANTHOCYANINS; INACTIVATION; PASTEURIZATION; PURIFICATION;
D O I
10.1002/jsfa.9079
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
BACKGROUNDThe objective of the present work was to study the effect of high-power ultrasound (HPU) on the microflora, enzymes and some quality attributes of a strawberry drink and to provide a theoretical basis for strawberry drink processing conducive to the development of more nutritious and healthier strawberry drinks. RESULTSFresh strawberry drink was subjected to HPU treatment at 20kHz (242, 605 and 968Wcm(-2)) for 2, 4, 6, 8 and 10min in an ice bath. Results showed that polyphenol oxidase (PPO), pectin methyl esterase (PME) and -glucosidase activities were decreased by 44.90, 89.11 and 84.71% respectively at 968Wcm(-2) for 10min. Lower L*, a* and b* values and higher browning degree (BD) were observed in HPU-treated samples, resulting in a significant increase in E value (P<0.05). HPU treatment caused loss of viscosity and turbidity, while total soluble solids (TSS) and pH of the strawberry drink were stable. Total phenol content and antioxidant capacity increased while anthocyanin content decreased compared with untreated samples. Total aerobic bacteria (TAB) and molds and yeasts (M&Y) were reduced by 2.07 and 1.13 log(10) cycles respectively at 968Wcm(-2) for 10min. CONCLUSIONSHPU can effectively achieve the effect of pasteurization and maintain the nutrients of strawberry drink. (c) 2018 Society of Chemical Industry
引用
收藏
页码:5378 / 5385
页数:8
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