Abstract
Agricultural residues like sugarcane bagasse (SCB), corn husk (CH), peanut husk (PNH), coffee cherry husk (CCH), rice bran (RB) and wheat bran (WB) are low-value byproducts of agriculture. They have been shown to contain significant levels of phenolic compounds with demonstrated antioxidant properties. In this study, the effects of two types of solvent extraction methods: solid–liquid extraction (SLE) and hot water extraction on the recovery of phenolic compounds from agricultural residues were investigated to optimize the extraction conditions based on total phenolic content (TPC), total tannin content (TTC) and total flavonoids content (TFC). Methanol (50 %) was found to be the most efficient solvent for the extraction of phenolics with higher DPPH, nitric oxide radical scavenging and reducing power activity, followed by ethanol and water. The phenolic compounds of methanolic extracts (50 %) were determined by reverse phase high performance liquid chromatography; in addition gallic acid became the major phenolic acid present in all the agricultural residues whereas ferulic acid, epicatechin, catechin, quercitin and kampferol present in lesser amounts. The present investigation suggested that agricultural residues are potent antioxidants. The overall results of this research demonstrated the potential of agricultural residues to be an abundant source of natural antioxidants suitable for further development into dietary supplements and various food additives.
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Acknowledgments
This research was supported by research grants to KS from DST and UGC-SAP, the Government of India, New Delhi. VS thanks UGC-SAP for providing JRF.
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Highlights
• Agricultural residues like sugarcane bagasse (SCB), corn husk (CH), peanut husk (PNH), coffee cherry husk (CCH), rice bran (RB) and wheat bran (WB) are used for the extraction of polyphenols.
• The effects of two types of solvent extraction methods: solid–liquid extraction (SLE) and hot water extraction on the recovery of phenolic compounds from agricultural residues were investigated to optimize the extraction conditions based on total phenolic content (TPC), total tannin content (TTC) and total flavonoids content (TFC).
• The types of polyphenols from different agricultural residues were analyzed by HPLC.
• The antioxidant activities like DPPH, NO and FRAP were also studied.
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Vijayalaxmi, S., Jayalakshmi, S.K. & Sreeramulu, K. Polyphenols from different agricultural residues: extraction, identification and their antioxidant properties. J Food Sci Technol 52, 2761–2769 (2015). https://doi.org/10.1007/s13197-014-1295-9
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DOI: https://doi.org/10.1007/s13197-014-1295-9