Extraction of phenolic compounds from Portulaca oleracea, L. leaves
Sukardi Sukardi (a*), Beauty Suestining Dyah Dewanti (a), Priskka Angelina Rumambi (a)

(a) Department of Agroindustrial Technology, Faculty of Agricultural Technology, Universitas Brawijaya, Jl. Veteran, Malang 65145, Indonesia

*Corresponding author: sukardi[at]ub.ac.id

Abstract

Portulaca oleracea is one type of weed that grows wild but contains compounds with antioxidant activity that has the ability to neutralize free radicals. The research used Microwave-Assisted Extraction (MAE) with a power of 200W using a centralized composite design (CCD) as an extraction method to extract phenol compounds by applying a combination of extraction time treatment (8, 9, 10 minutes) and solid:liquid ratio (1:30, 1:40, 1:50 g/mL) on 13 samples tested for yield, total phenol, and antioxidant activity value. Based on the test results, the lowest yield (12.13%) was obtained at an extraction time of 7.5 minutes and the solid:liquid ratio 1:40 g/mL. The highest yield (45.13% to 45.6%) was obtained at the use of extraction time 9 and 8 minutes and solid:liquid ratio (1:50 to 1:54 g/mL). The use of MAE increases the yield by 45% in less than 11 minutes compared with maceration for 24 hours only produces a yield of 10-20%. The total phenol value ranged from 26.48 to 67.88 mg GAE/g, and the antioxidant activity value was moderate to very weak (144.09 to 326.26 ppm).

Keywords: Antioxidant- Portulaca oleracea- Microwave-Assisted Extraction

Topic: Agricultural product technology