Experimental and modeling for catechin and epicatechin recovery from peanut skin using subcritical ethanol

Abstract

A study on the valorization of peanut (Arachis hypogea) skin as agricultural waste to recover bioactive compounds, including catechin and epicatechin, by subcritical ethanol extraction (SEE) is unexplored scientifically. Thus, this study aims to determine the parameter effects on peanut skin extract recovery by SEE, followed by identifying the semi-empirical modeling. The best conditions were 6 MPa, 4.53 ml/min, 86.23 C with responses of catechin 188.66 μg/g and epicatechin 336.41 μg/g. High pressure and temperature conditions are conducive to catechin recovery, whereas high pressure with low-temperature conditions is suitable for epicatechin enhancement. Del Valle Aguilera (DVA) fits the solubility of catechin and epicatechin in SEE effectively compared with the Chrastil model since it has the lowest average absolute relative deviation (AARD), which is 5.97% and 12.69%, respectively. As a result, this approach (SEE) may be used in place of the conventional method for extracting catechin and epicatechin for medicinal purposes.

Valorization of Peanut Skin as Agricultural Waste Using Various Extraction Methods: A Review

“…Regular use can help prevent Parkinson's, diabetes, cancer, and other diseases [44]. However, producing highly active catechin may be problematic because it is rapidly broken down when exposed to light due to UV radiation from the sun [2,45]. Furthermore, catechin reduces hemoglobin levels by delaying the oxidative process in hemoglobin cells [46].…”

“…Significant quantities of peanut powder, shells, hulls, and vines are also classified as agricultural waste. Due to the fact that the great majority of studies concentrate on oil and kernel production, peanut byproducts such as peanut skin get little study [2].…”