Premium
Optimization of ultrasonic‐assisted extraction of antioxidant tannin from young astringent persimmon ( Diospyros kaki L.) using response surface methodology
Author(s) -
Liu Miaomiao,
Wang Jing,
Yang Kun,
Qi Yiman,
Zhang Jie,
Fan Mingtao,
Wei Xinyuan
Publication year - 2018
Publication title -
journal of food processing and preservation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.511
H-Index - 48
eISSN - 1745-4549
pISSN - 0145-8892
DOI - 10.1111/jfpp.13657
Subject(s) - astringent , tannin , diospyros kaki , extraction (chemistry) , dpph , chemistry , response surface methodology , polyphenol , condensed tannin , chromatography , food science , antioxidant , botany , proanthocyanidin , biochemistry , biology , taste
Ultrasonic‐assisted extraction (UAE) was applied for tannin extraction from young persimmon ( Diospyros kaki L.) and extraction conditions were optimized using response surface methodology to compare with traditional water bath extraction (WBE). The maximum yield (33.96 mg/g) extracted by UAE was obtained under conditions of ultrasonic power 207 W, time 30.9 min, L:S ratio 21.1:1 (mL:g) and 55.0 °C, whereas tannin yield reached 32.39 mg/g under parameters of 73.5 °C, time 63.0 min, and L:S ratio 32.4:1 (mL:g) when using WBE. Comparatively, higher tannin was extracted under optimal UAE condition than WBE method, mainly associated with its great damage on original structure of persimmon pulp and peel based on morphological analysis. While there was no significant difference for UV and FT‐IR spectra among tannin extracted by different methods. Moreover, tannin possessed excellent DPPH radical scavenging and ferric reducing activities in a dosage‐dependent manner, showing potential application in medicinal and food industry. Practical applications Young astringent persimmon possesses abundant functional tannin that is beneficial to human health. Tannin extraction is the most fundamental process for its further research and application. Traditional methods for bioactive compounds extraction are generally conducted with high temperature, large solvent consumption and long time. This study illuminated that ultrasonic‐assisted extraction method had great potential to replace traditional water bath to extract antioxidant tannin from young persimmon.