Indah Dwiatmi Dewijanti

Antioxidant activity, phenolic and flavonoids total of ethanolic extract of Ipomoea batata L. leaves (white, yellow, orange, and purple)

Antioxidant activity, phenolic and total flavonoids from sweet potato ethanol extract (Ipomea batatas L.) of different varieties (white, yellow, orange and purple) were studied. Sweet potatoes were collected from Research Centre for Chemistry. Sweet potato leaves have been used for numerous oxidative-associated diseases such as cancer, allergy, aging, HIV and cardiovascular. 1,1-diphenyl-2-picryl hydrazyl (DPPH) method was used to investigate antioxidant activity in leaves, in which the yellow and purple varieties showed the highest and the lowest scavenging activities of 47.65 µg/ ml (IC50) and 87.402 µg/ ml (IC50), respectively. In this study, the yellow leaves showed the highest concentrations of total phenolic and flavonoids contents at 11.293 µg/g and 44.963 µg/g, respectively. Therefore, sweet potato leaves can be used as a prospective natural antioxidant.

Antioxidant activities of phenolic compounds isolated from the leaves of Macaranga allorobinsonii Whitmore

Two secondary metabolites compounds, gallic acid (1) and methyl gallate (2) have been isolated from the ethyl acetate fraction of the methanol extract of the leaves of Macaranga allorobinsonii Whitmore. Isolation and purification of the secondary metabolite compounds conducted using chromatography methods, and structure elucidation determined based on NMR, mass spectroscopic data and compared with appropriate references.Two secondary metabolites compounds, gallic acid (1) and methyl gallate (2) have been isolated from the ethyl acetate fraction of the methanol extract of the leaves of Macaranga allorobinsonii Whitmore. Isolation and purification of the secondary metabolite compounds conducted using chromatography methods, and structure elucidation determined based on NMR, mass spectroscopic data and compared with appropriate references.

Toxicity and Lethality Evaluations of Koordersiodendron pinnatum Leaves Methanolic Extract in DDY Mice

The study of toxic features of Koordersiodendron pinnatum is vital for further studies of its pharmacological activities. Acute toxicity test was done on methanolic extracts of K. pinnatum in DDY mice. Animals were grouped into five: Group 1 was given 1 mL solution of 2.5% Tween 80 in a single oral dose; the remaining groups were orally given a single dose of 2, 4, 8 and 16 g/kg of K. pinnatum, respectively. Toxic effects of the extract were evaluated on the basis of behavioral observations in the form of locomotor activity; curiosity; defecation; urination and also animal mortality. Observations were carried out for 14 days. No significant changes on body weight, and behavioural activities were recorded. Mortality was recorded up to 2% of the male group, and no mortality within the female group. The extract is practically non toxic for both male and female (LD50>15 g/kg).