@article {1123, title = {Study of the Effect of Lampeni (Ardisia humilis Vahl.) Planting Condition toward the Alpha-glucosidase Inhibition Activity in vitro}, journal = {Pharmacognosy Journal}, volume = {12}, year = {2020}, month = {March 2020}, pages = {377-385}, type = {Research Article}, chapter = {377}, abstract = {

Background: The quality of a medicinal plant is influenced by agronomic conditions and harvesting time. Objective: This study aimed to evaluate the effect of planting method (openair (OA) and shedding house (SH)) and harvesting time (2, 4, 6 months) of Lampeni (Ardisia humilis Vahl.) toward the inhibitory activity of alpha-glucosidase. Methods: The Lampeni seedling were placed under controlled light conditions (SH) and on direct sun exposure (OA). Harvesting of the leaves was carried out at the age of 2, 4, and 6 months after plantation (2m, 4m, and 6m). Each leaves dry powder was refluxed with methanol 70\% and followed by liquid-liquid partition using n-hexane, ethyl acetate (EtOAc), and water. All samples were evaluated toward inhibition of the alpha-glucosidase enzyme in vitro. Total phenol levels were determined using Folin-Ciocalteu reagent. Results: The results showed that EtOAc fractions of both plantation techniques exhibited the highest inhibition of alpha-glucosidase. The highest activity was demonstrated by the 4m-OA-EtOAc fraction (IC50, 93.50 ppm) and followed by the 6m-OA-EtOAc fraction (IC50, 98.13 ppm). Based on the kinetic study, the inhibition type of the two most active samples were categorized as a non-competitive type. Total phenolic contents were decreased in the following order: 6m-SH-EtOAc \> 4m-OA-EtOAc \> 6m-OAEtOAc \> 4m-SH-EtOAc fraction. It was shown that there was no positive correlation between the strength of inhibition with total phenolic content. Conclusions: This study concluded that Lampeni at open-air plantation harvested on fourth months demonstrated the highest alpha-glucosidase inhibitory activity, although there was no positive correlation between the inhibition activity and phenolic content.

}, keywords = {Alpha-glucosidase, Ardisia humilis Vahl., Lampeni, Open-air, Shedding house, total phenolic}, doi = {10.5530/pj.2020.12.59}, author = {Sri Ningsih and Fifit Juniarti and Idah Rosidah and Adam Arditya Fajriawan and Kurnia Agustini and Syofi Rosmalawati and Agung Eru Wibowo and Erliana Sasikirana and Wahono Sumaryono} }