Influence of sonication treatments and extraction solvents on the phenolics and antioxidants in star fruits

Abstract

The present study was conducted to examine the effects of sonication treatments (time intervals of 0, 15, 30, 45 and 60 min.) on phenolics and other antioxidant compounds in starfruits extracted in methanol and water. Overall, methanolic extracts exhibited significantly higher extractability, percentage inhibition of DPPH radicals, ferric reducing antioxidant property (FRAP) value, antioxidant capacity, flavonoids, total phenolics and tannins (p<0.05) compared to control (0 min) and aqueous extracts. Methanolic extract obtained after 30 min of sonication proved to be the best treatment with regard to various parameters evaluated. Results of the present study clearly indicated sonication treatments to be effective in enhancing the antioxidant compounds in starfruit extracts and could be further explored for commercial purposes to benefit the consumers.

Thermosonication: a potential technique that influences the quality of grapefruit juice

“…Fruits are an important source of phenolic compounds in our diet, and these phenolic compounds play a significant role in flavour and colour development and have a major role in human health by controlling the threat of many diseases (Annegowda et al, 2012). The effects of TS on DPPH free radical scavenging activity, total antioxidant capacity (TAC), total phenols, total flavonoids and total flavonol of grapefruit juice were shown in Table S3.…”

Antioxidant Phenolic Compounds of Ethanolic and Aqueous Extracts from Pink Cedar (Acrocarpus fraxinifoliusWhight & Arn.) Bark at Two Tree Ages

“…The extract yield and phenolic concentration depend on the solvent and method of extraction. [12][13][14][15][16][17][18][19] Pink cedar, mundani, and lazcar are common names of Acrocarpus fraxinifolius (Fabaceae), which is native to Southeast Asia and was introduced into Mexico many years ago. It is a fast-growing tree that can grow annually 1.3 to 3 m and attain a height of 25 to 30 m. The species grows in acid and calcareous soils, and at elevations between sea level and up to 2000 m. In Mexico, it has been planted at 1700 m elevation, in forest areas with rainfall between 500 and 3000 mm, and temperatures between 15 and 26 • C. [20] Some reports have pointed out that the trees grow well during the first three years, but later, in some areas, they suffer dieback from the top to the bottom of the tree.…”

Effect of ultrasonic pretreatment on the antioxidant properties of porcine liver protein hydrolysates

“…These peptides, with certain hydrophobic amino acids residues at the end of the peptide chain, exhibit strong antioxidant activities (Liu et al ., ; Yu et al ., ). By using ultrasonic pretreatment during proteolysis, an increased concentration of carboxylic and amino groups in the branches of the acidic and basic amino acids enhances the antioxidant activities of protein hydrolysates; this might also explain why the DPPH radical scavenging and ferrous ion chelating activities of PLPHs in this study were enhanced after ultrasonic pretreatment for 30–45 s. The results agree with those of previous studies (Annegowda et al ., ; Yu et al ., ).…”