Effect of different drying methods on the antioxidant properties of leaves of Centella asiatica

Abstract

Centella asiatica is one of the vital plant sources of antioxidants properties for consumption or medicinal purposes. This study aimed to determine the effect of three different drying methods (freeze drying, oven drying and dehydration drying) on the antioxidant of leaves of C. asiatica. The antioxidant properties and IC50 value of different concentration of methanolic extract solution (0.5 mg/ml, 0.25 mg/ml, 0.125 mg/ml and 0.062 mg/ml), were evaluated using 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. The drying conditions and time required for freeze drying, oven drying and dehydration drying were -45°C for 3 days, 60°C for 5 hours and 35-43°C within 1-3 hours, respectively. Samples with lower IC50 value showed a stronger antioxidant activity since low IC50 determine the efec. The freeze-dried of C. asiatica sample at 0.05 mg/ml concentration exhibited the highest scavenging activity (93.97 ± 0.45%) with the lowest IC50 value (0.05 mg/ml) whereas the lowest scavenging activity was shown by dehydration dried of C. asiatica sample at 0.05 mg/ml concentration (55.08 ± 0.03%) with the highest IC50 value (0.36 mg/ml). This indicates that as the concentration increases, the radical scavenging activity increases. Thus, it is highly recommended to use freeze drying as the method to conserve the maximum amount of antioxidant properties in C. asiatica leaves.

The Effect of Production and Post-Harvest Processing Practices on Quality Attributes in Centella asiatica (L.) Urban—A Review

“…The antioxidant activity in C. asiatica leaves was higher in freeze drying in comparison with oven drying and dehydration drying [139]. Although freeze drying may be a slow and cost-intensive method, it produced best-quality material for pharmacological activities.…”

Study on Antibacterial and Antioxidant Activity of Extracts from Hydroponic Pennywort Tubers (Centella Asiatica (L.) Urban)

“…Recent studies consider pennywort as an antioxidant, reducing the effects of stress both in vitro and in vivo. The high antioxidant contents present in this plant suggest that it could serve as a potential alternative source of natural antioxidants (Abdul Rahim et al, 2021). Moreover, pennywort has demonstrated antibacterial properties, effectivelyresist bacteria that cause disease and food poisoning (Norzaharaini et al, 2011;Pitinidhipat and Yasurin 2012).…”