The influence of horse mint (Mentha longifolia) leaves on antioxidant activity and lowering lipid peroxidation in roasted coffee powder

Abstract

The present research investigation sought to learn more about the impact of various quantities of Mentha longifolia leaves powder (MLLP) on the content of phenolics, antioxidant effectiveness, consumer approval, as well as lowering lipid peroxidation in roasted coffee (RC) powder. MLLP was added at 0%, 0.25%, 0.50%, 0.75, 1.00%, and 1.25% of the roasted coffee (RC) weight. Total phenolics (TP), total flavonoids (TF), as well as the antioxidant activity which was assessed using a 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical of green coffee (GC), RC, MLLP, and binary blends of RC and MLLP were assessed. The oxidative indices of coffee oil samples have been investigated during storage intervals. Furthermore, the sensory qualities of RC fortified with various dosages of MLLP were investigated. Findings MLLP showed TP contents (TPC, 2600.15 mg/100 g DWb) which was 1.83 fold greater than those reported in roasted coffee (RC) powder. The results also revealed that when the MLLP quantity increased, TPC of the investigated coffee samples significantly increased. TPC of the produced coffee increased from 1417.30 to 1432.18 mg GAE/100 g DW when MLLP inclusion incremented from 0% to 1.25%. TFC of RC supplemented with 0.5%, 0.75%, 1.00%, and 1.25% MLLP was found to be around 1.04, 1.04, 1.05, and 1.06 times greater than that of control coffee samples without MLLP addition, respectively. DPPH radical-scavenging activity increased significantly from 67.74% in control samples (without MLLP enrichment) to 69.59, 69.74, 70.32, and 71.45 (percent DPPH inhibition) in RC samples enriched with 0.50%, 0.75%, 1.00%, and 1.25% MLLP, respectively. The acid, peroxide, P-Anisidine, and Totox values of RC enriched with 1.25 MLLP were around 2.08, 1.76, 1.64, and 1.70 fold lower, respectively, than in the control sample without MLLP addition. The sensory scores of RC containing 0.50% and 0.75% MLLP were significantly higher (p ≤ 0.05) than control samples.