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Garlic (Allium sativum L.) husk waste as a potential source of phenolic compounds: Influence of extracting solvents on its antimicrobial and antioxidant properties.

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Title: Garlic (Allium sativum L.) husk waste as a potential source of phenolic compounds: Influence of extracting solvents on its antimicrobial and antioxidant properties.
Authors: Kallel, Fatma1, Driss, Dorra1, Chaari, Fatma1, Belghith, Lilia1, Bouaziz, Fatma1, Ghorbel, Raoudha1,2, Chaabouni, Semia Ellouz1,2 Semia.Chaabouni@enis.rnu.tn
Source: Industrial Crops & Products. Dec2014, Vol. 62, p34-41. 8p.
Subjects: Garlic, Physiological effects of phenols, Solvent extraction, Anti-infective agents, Antioxidants, Aqueous solutions
Abstract: This paper reports the extraction process of polyphenols from the industrially disposed garlic husk (GH) using different studied solvents (water, methanol, ethanol and 50% aqueous solutions of methanol and ethanol). The highest extraction yield was achieved with water (26.5%) and high bioactive potential was shown by the samples extracted with 50/50 methanol/water (25 mg GAEs/g dry GH, 0.617 mg QE/g dry GH, IC 50 = 0.26 mg/mL for DPPH assay, RP 0.5AU = 2.8 mg/mL for reducing power, and IC 50 = 0.45 mg/mL for hydroxyl radical assay). All the extracts exhibited antimicrobial activity against Gram-positive bacteria, when applied at different concentrations (1–10 mg/mL). Only 50/50 methanol/water and absolute methanol extracts inhibited the growth of Pseudomonas aeruginosa and Klebsiella pneumonia . These interesting biological properties could be attributed to the major identified phenolic compounds, such as caffeic, p -coumaric, ferulic and di-ferulic acids. With this procedure, the GH waste polyphenols could be used as a cheap source of natural compounds, with potential applications in the food and health sectors. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:This paper reports the extraction process of polyphenols from the industrially disposed garlic husk (GH) using different studied solvents (water, methanol, ethanol and 50% aqueous solutions of methanol and ethanol). The highest extraction yield was achieved with water (26.5%) and high bioactive potential was shown by the samples extracted with 50/50 methanol/water (25 mg GAEs/g dry GH, 0.617 mg QE/g dry GH, IC 50 = 0.26 mg/mL for DPPH assay, RP 0.5AU = 2.8 mg/mL for reducing power, and IC 50 = 0.45 mg/mL for hydroxyl radical assay). All the extracts exhibited antimicrobial activity against Gram-positive bacteria, when applied at different concentrations (1–10 mg/mL). Only 50/50 methanol/water and absolute methanol extracts inhibited the growth of Pseudomonas aeruginosa and Klebsiella pneumonia . These interesting biological properties could be attributed to the major identified phenolic compounds, such as caffeic, p -coumaric, ferulic and di-ferulic acids. With this procedure, the GH waste polyphenols could be used as a cheap source of natural compounds, with potential applications in the food and health sectors. [ABSTRACT FROM AUTHOR]
ISSN:09266690
DOI:10.1016/j.indcrop.2014.07.047