Combined impact of pulsed electric field and ultrasound on bioactive compounds and FT-IR analysis of almond extract
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The aim of this paper is to investigate the combined impact of pulsed electric field (PEF) and ultrasound (US) to evaluate the physicochemical, bioactive compounds and chemical structure of almond extract. Almond extract was first treated with PEF and then with US. Combined treatment (PEF–US) has attained the highest value of total phenolics, total flavonoids, condense tannins, anthocyanin contents and antioxidant activity in DPPH, reducing power and metal chelating activity than all other treatments. Among all those treatments, there was slightly visible difference in the color. Moreover, FT-IR spectra indicate that the effect of PEF-US on almond extract did not produce new carbonyl compounds, but led to the higher concentration of these compounds. This study demonstrated that the PEF-US could be useful for the extraction of bioactive compounds as well as improving the stability of volatile compounds.
KeywordsAlmond Non-thermal techniques Bioactive compounds FT-IR analysis
This research was supported by the National “Thirteenth Five” Key Research Project (2017YFD0400502), the 111 Project (B17018), the National Natural Science Foundation of China (21576099) and the S&T projects of Guangdong Province (2017B020207001 and 2015A030312001). In addition, Muhammad Faisal Manzoor is in receipt of a financial support for PhD scholarship from the China Scholarship Council (CSC).
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