Direct steam injection pretreatment improves microwave-assisted extraction yield for total flavonoids and myricetin from Hovenia dulcis Thunb.

Abstract

A direct steam injection pretreatment was added before the microwave-assisted extraction procedure for the extraction of flavonoids from seeds of Hovenia dulcis Thunb, and the antioxidant activity of flavonoid extracts was determined. Based on the experimental results, the addition of direct steam injection simultaneously increased the extraction yield of total flavonoids compared with direct microwave-assisted extraction, and antioxidant activity of flavonoid extracts obtained by adopting the steam injection pretreatment was higher than that by direct microwave extraction alone. Myricetin was isolated from the flavonoid extracts, and the structure was identified by infrared spectroscopy (IR), electrospray ionization mass spectrometry (ESI-MS), and 1H nuclear magnetic resonance (1H-NMR). Recovery yield of total flavonoids was increased by 11.63% when the direct steam injection pretreatment was added to direct microwave extraction.

Non-destructive determination of the oil content in peach palm (Bactris gasipaes) flour using NMR and NIR spectroscopies

“…NIR spectroscopy is a powerful non-destructive tool for quantitative and qualitative analyses and has been widely used in food science (Bizzani et al, 2017;Malegori et al, 2017;Oliveira et al, 2014;Silva et al, 2021;Zhou et al, 2023), chemistry (Fernandes et al, 2008), medicine (Trenfield et al, 2022), and industrial quality control processes (Blanco et al, 2007). TD-NMR has also been widely applied in food science (Bizzani et al, 2020;Machado et al, 2022;Qu et al, 2021;Wang et al, 2018) and several methods have been recognized by various international agencies, like the International Organization for Standardization (ISO) and International Union of Pure and Applied Chemistry (IUPAC) (Todt et al, 2006). Nevertheless, most applications of TD-NMR in food science have been developed in the last two decades with the introduction of new and more versatile hardware and software and new methods for signal acquisition and processing (Colnago et al, 2021).…”

Process optimization of deep eutectic solvent-based microwave-assisted extraction of flavonoids from Ziziphi Spinosae Semen using response surface methodology

“…Tran et al (2022) evaluated the effect of extraction conditions of three extraction methods on the yield of polyphenols and flavonoids in Pomelo peels and found that among the three methods, microwave-assisted extraction was considered the most efficient method to obtain the high yield of polyphenols. More importantly, MAE can also replace organic solvents with alternative "green" solvents, thus reducing the use of organic solvents (Qu et al, 2021). In addition, MAE allows for higher yields in shorter extraction times, making the extraction of total flavonoids more environmentally friendly and efficient (Chaves et al, 2020).…”