Optimizing anthocyanins extraction and the effect of cold plasma treatment on the anti‐aging potential of purple glutinous rice (Oryza sativa L.) extract

Abstract

Background and objectives The pericarp of color rice is a rich source of anthocyanins conferring several health benefits. The present study aimed to systemically optimize anthocyanins extraction from Thai purple glutinous rice and to elucidate the effect of cold plasma on the anti‐aging effect of the extract. Findings Antioxidant effects and phytochemical constituents of the extracts from three Thai purple glutinous rice varieties including Doi Saket, Phayao, and Luem Pua were elucidated. Cyanidin‐3‐O‐glucoside (CNG) was a major compound in all varieties. Besides, Luem Pua rice extract presented the strongest antioxidation owing to its highest total phenolic and CNG contents. The optimized method for extracting CNG, which was proceeded by 2‐level full factorial design, used deionized (DI) water with pH 2.0 and temperature 150°C. Moreover, the cold plasma‐treated Luem Pua rice offered a five‐fold higher amount of CNG compared to the untreated sample with a significantly stronger anti‐aging potential. Conclusions Our study provided the optimized method for CNG extraction from purple rice. Additionally, cold plasma potentially enhanced the anti‐aging property of the extract. Significance and novelty The contributions of the extracting factors on antioxidation and anthocyanins content were statistically elucidated, and the novel performance of cold plasma on biological properties of the plant materials was demonstrated.

Phytochemical Analysis and Antioxidant, Antimicrobial, and Antiaging Activities of Ethanolic Seed Extracts of Four Mucuna Species

“…The amount of total phenolic compounds in the crude extracts was determined by using Folin-Ciocalteu reagent [34,35]. Gallic acid was used as a standard.…”

“…The total flavonoid contents in the extracts were determined by the aluminum chloride colorimetric method [34]. A standard stock solution (4 mg/mL) of quercetin was prepared by dissolving 4 mg of quercetin in 1 mL of absolute ethanol.…”

The in vitro effects of black soldier fly larvae (Hermitia illucens) oil as a high-functional active ingredient for inhibiting hyaluronidase, anti-oxidation benefits, whitening, and UVB protection

“…The lipid peroxidation inhibition property of samples was determined using the linoleic acid thiocyanate method ( Poomanee et al, 2021 ). Each sample was mixed with linoleic acid in methanol, phosphate buffer pH 7.0, DI water and AAPH in a test tube.…”

Current and Potential Applications of Atmospheric Cold Plasma in the Food Industry

“…One of hypotheses that may explain the higher content of polyphenols after ACP processing is the rupture of cell membranes, which leads to the release of potent compounds [ 105 ]. Nevertheless, comprehensive research on plasma extraction technology is limited, as most publications focus on polyphenol extraction and enhancement of antioxidant activity [ 106 , 107 ]. Unlike other processing technologies, ACP is not directly utilised as an extraction method; rather, it is commonly used as a pre-treatment step [ 108 ].…”