Exploration of the Antioxidant Chemical Constituents and Antioxidant Performance of Various Solvent Extracts of Eighteen Plants

Abstract

This study examined the antioxidant chemical constituents (total phenolic and total flavonoid contents) and antioxidant activities [1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) radical scavenging, and ferric reducing antioxidant power (FRAP)] of different solvent extracts of eighteen functional plants. The active components of the target plants were extracted using four different solvents (methanol, ethanol, chloroform, and water). Mentha piperascens leaf exhibited a higher total phenolic content (chloroform and water extracts), total flavonoid content (all solvent extracts), DPPH radical scavenging activity (methanol, ethanol, and water extracts), ABTS radical scavenging activity (water extract), and FRAP radical scavenging activity (water extract) (in all solvent extracts). Similarly, Petasites japonicas root was another excellent and competent extract with a high total flavonoid content (in all four solvent extracts), DPPH and ABTS radical scavenging activity (methanol, ethanol, and water extracts), and FRAP activity (methanol, ethanol, and water extracts) (in all solvent extracts). Rubus coreanus fruit had the highest total phenolic content (methanol, ethanol, and water extracts), DPPH and ABTS radical scavenging activate (in all solvent extracts), and FRAP in its water extract were the two most effective functional plants. Based on the abundance of antioxidant chemical constituents and the most potent antioxidant activity demonstrated in this study, extracts from M. piperascens leaf, P. japonicas root, and R. coreanus fruit appear to be promising candidates to meet the current demand for natural preservatives in food and pharmaceutical industries.

Physicochemical Properties, Antioxidant Capacities, and Sensory Evaluation of Yanggaeng Treated with Cissus quadrangularis

“…Ethanol extracts of Yanggaeng were prepared before evaluating their antioxidant capacities. DPPH and ABTS radical scavenging activities were determined using the previously described methods [31,32], respectively. FRAP was conducted according to the procedure outlined in a previous report [33].…”

Comparative anti‐inflammatory effect of extract from novel Korean strawberry cultivars (Fragaria × ananassa) on lipopolysaccharide‐induced RAW264.7 macrophages and mouse model

“…For example, the ethanolic extract of the strawberry fruit cultivar Sweet Charlie showed in vivo antidiabetic effects 7 . In another study, the ethanolic extract of the Indian strawberry Duchesnea chrysantha exhibited antimicrobial activity against both Gram‐positive and Gram‐negative pathogenic bacteria, 8 whereas the methanolic extract of the strawberry fruit cultivar Romina displayed neuroprotective effect 9 . Additionally, the health effects of strawberry are attributed to its role as a major provider of dietary anthocyanins, which serve as bioactive compounds to attenuate inflammation, sequester radicals and mediate gut microbiota 10 …”

Phytochemical Composition and Antioxidant and Anti-Inflammatory Activities of Ligularia fischeri Turcz: A Comparison between Leaf and Root Extracts

“…Oxidative stress and inflammation are associated with the pathogenesis of various diseases, such as cardiovascular diseases, neurodegenerative diseases, inflammatory bowel diseases, aging, and cancer [ 6 , 7 ]. Fortunately, antioxidants, such as polyphenols and flavonoids act as reducing agents, metal chelators, and enzyme inhibitors and are capable of eliminating free radicals and inhibiting the formation of oxidants [ 8 , 9 ]. Therefore, dietary phytochemicals are essential for protecting against oxidative and inflammatory damage and preventing pathological conditions.…”