Effects of storage time and temperature on polyphenolic content and qualitative characteristics of freeze-dried and spray-dried bayberry powder

• Published in: Food science & technology 2017-05, Vol.78, p.235-240
• Main Authors: Cheng, An-Wei, Xie, Hong-Xia, Qi, Yan, Liu, Chao, Guo, Xu, Sun, Jin-Yue, Liu, Li-Na
• Format: Article
• Language: English
• Subjects: Anthocyanin; Bayberry fruit; Polyphenol; Qualitative characteristic
• ISSN: 0023-6438; 1096-1127
• DOI: 10.1016/j.lwt.2016.12.027

To extend shelf-life and develop new bayberry products, the effects of storage time and temperature on polyphenolic content and qualitative characteristics of freeze-dried and spray-dried bayberry power were studied. Results showed that the retention of total polyphenols, gallic acid, protocatechuic acid, cyanidin-3-o-glucoside and anthocyanins in the freeze-dried bayberry powder was in most cases higher than in the spray-dried powder when they were stored for the same period. The content of these components in both the freeze-dried and spray-dried bayberry powder decreased gradually with the longer storage time. No significant difference was detected for the retention of these compounds whether they were stored at 4 °C or 25 °C. The browning index of both the freeze-dried and spray-dried powder significantly increased during a 50-day storage period. The ΔE value of the bayberry powder stored at 25 °C was distinctly higher than that of the other treated samples; a value of the spray-dried powder was slightly higher than that of the other samples. All presented results indicate that freeze-drying and 4 °C storage is an efficient and convenient method to maintain the bioactive polyphenolic components and high-qualitative characteristics of bayberry fruits. •The high retention of phenolic compounds was detected in freeze-dried bayberry powder.•Longer storage time decreased gradually phenolic content in bayberry powder.•The high value of a was detected in the spray-dried powder stored at 4 °C.•Freeze-drying is a feasible way to keep high-qualitative characteristics of bayberry.