Optimization of simultaneous microwave/ultrasonic-assisted extraction of phenolic compounds from walnut flour using response surface methodology

Pharmaceutical Biology

Wanxing Wu¹  Chaoyin Chen¹  Dan Chen²  Yan Luo³  Yage Ma³  Shenglan Zhao³  Yuping Lin³ 

[1] Kunming University of Science and Technology;The Chemical Analysis Division, Yunnan Institute of Tobacco Quality Inspection and Supervision;Yunnan University of Traditional Chinese Medicine;

关键词: walnut polyphenol;    central composite design (ccd);    total polyphenol yield (tpy);    constituent identification;    lc–ms;   

DOI  :  10.1080/13880209.2017.1347189

来源: DOAJ

【 摘 要 】

Context: Walnut is a traditional food as well as a traditional medicine recorded in the Chinese Pharmacopoeia; however, the large amounts of walnut flour (WF) generated in walnut oil production have not been well utilized. Objective: This study maximized the total polyphenolic yield (TPY) from the walnut flour (WF) by optimizing simultaneous ultrasound/microwave-assisted hydroalcoholic extraction (SUMAE). Materials and methods: Response surface methodology was used to optimize the processing parameters for the TPY, including microwave power (20–140 W), ultrasonic power (75–525 W), extraction temperature (25–55 °C), and time (0.5–9.5 min). The polyphenol components were analysed by LC–MS. Results: A second-order polynomial model satisfactorily fit the experimental TPY data (R2 = 0.9932, P < 0.0001 and Radj2    = 0.9868). The optimized quick extraction conditions were microwave power 294.38 W, ultrasonic power 93.5 W, temperature 43.38 °C and time 4.33 min, with a maximum TPY of 34.91 mg GAE/g, which was a rapid extraction. The major phenolic components in the WF extracts were glansreginin A, ellagic acid, and gallic acid with peak areas of 22.15%, 14.99% and 10.96%, respectively, which might be used as functional components for health food, cosmetics and medicines. Discussion and conclusion: The results indicated that walnut flour, a waste product from the oil industry, was a rich source of polyphenolic compounds and thus could be used as a high-value functional food ingredient.

【 授权许可】

Unknown