Comparison of Phytochemical Contents, Antioxidant and Antibacterial Activities of Various Solvent Extracts Obtained from ‘Maluma’ Avocado Pulp Powder

Abstract

Although avocado is a superfood rich in phytochemicals with high antioxidant activities, studies on the antibacterial properties of its pulp are limited, except for seed and peel portions. In this study, three types of solvent (acetone, methanol, and diethyl ether) were used to obtain the extracts from “Maluma” avocado pulp powder prepared by infrared drying. The extracts were analyzed for total polyphenols, phytopigments (total chlorophylls and carotenoids), antioxidant activities (ferric-reducing antioxidant power (FRAP), 2,2-Diphenyl-1-picrylhydrazyl (DPPH), and 2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) assays), and antibacterial activities against seven pathogens (Shigella sonnei ATCC 9290, Escherichia coli ATCC 8739, Salmonella typhi ATCC 6539, Vibrio parahaemolyticus ATCC 17802, Proteus mirabilis ATCC 25933, Staphylococcus aureus ATCC 6538, and Bacillus cereus ATCC 11778). The results showed that the acetone solvent could extract the highest polyphenols and chlorophylls with the highest antioxidant activity in terms of ABTS and DPPH assays. In contrast, diethyl ether exhibited the most significant content of carotenoids and FRAP values. However, the methanol extract was the best solvent, exerting the strongest antibacterial and meaningful antioxidant activities. For the bacterial activities, Gram-positive pathogens (Bacillus cereus and Staphylococcus aureus) were inhibited more efficiently by avocado extracts than Gram-negative bacteria. Therefore, the extracts from avocado powder showed great potential for applications in food processing and preservation, pharmaceuticals, and cosmetics.

Nanoencapsulation of apocynin and vanillic acid extracted from Picrorhiza kurroa Royle ex Benth plant roots and its characterisation

“…Whereas, the acetone extract (47.5 mg GAEq./mg) showed the lowest antioxidant activity among the studied extracts. Similar high antioxidant activity of ethanolic and methanolic extracts of avocado pulp powder with the highest anti-bacterial activity has been reported recently [ 39 ].…”

Bioactivity Guided Study for the Isolation and Identification of Antidiabetic Compounds from Edible Seaweed—Ulva reticulata

“…This could be because the seaweed may contain a high concentration of polar bioactive chemicals soluble in highly polar solvents such as methanol. Methanol has been reported to be more efficient in extracting polyphenols with lower molecular weights [41,42]. These findings suggest that methanol is the most effective solvent for extracting bioactive chemicals from Ulva reticulata.…”

Phytochemical Composition, Antibacterial Activity and Acute Toxicity Studies of Euphorbia resinifiera O. Berg

“…Methanol extracts of different plant species have been reported to show strong antibacterial activity against a wide range of bacteria since they possess the highest antibacterial and significant antioxidant activities. [29][30] Moreover, it has been indicated in previous studies that sonicationassisted extracts exhibited the best antimicrobial properties. [31][32] Results also showed that the lowest inhibitory effect was recorded with the extract obtained by infusion (extract 7) against E. coli, Mycobacterium, and Pseudomonas.…”