Fern is one of the groups of primitive plants rich in secondary metabolites that are commonly used to treat various diseases, including antioxidant, anti-hyaluronidase, anti-inflammation, and respiratory disease but less investigated. Flavonoid is one of the secondary metabolites abundantly present in ferns. This study aims to isolate major compounds found in Blechnum orientale act as 15-lipoxygenase (15-LOX) inhibitors. Inhibition of lipoxygenase decrease the production of leukotriene that induces bronchoconstriction in asthma. Isoquercitrin (Quercetin-3-O-β-glucopyranoside) and trifolin (kaempferol-3-O-β-D-galactoside) have been successfully isolated from Blechnum orientale. Further in silico study was performed to explain the binding mode between flavonoid pyranoside or galactoside and flavonoid aglycone in the 15-LOX cavity and their amino acid residues interaction. Isoquercitrin binds with Ile663, Ile400, Leu408, Leu597, Ala404, and Arg403 in the 15-LOX cavity as a lipoxygenase inhibitor. Trifolin binds the same amino acids as isoquercetin with addition His366, Gln596, and Phe175. Both isoquercitrin and trifolin act as competitive inhibitors against lipoxygenase enzymes.

Cinchona officinalis is known as the source of alkaloid compounds. Almost 7-12 % of alkaloids were contained in its bark. Not many studies reported other chemical compounds in it. This research aimed to isolate non-alkaloid compounds in the C. officinalis bark. It was extracted by maceration using n-hexane, ethyl acetate, and ethanol. The alkaloidal fraction was separated from ethylacetate extract based on acid-base reaction. The fractions were continued to the next step of fractionations using vacuum liquid chromatography (VLC) and radial chromatography to yield compound 1. Characterizations of compound 1 were done by spectroscopic methods (UV, IR, ESI-MS, NMR ( 1 H-, 13 C-, HSQC, and HMBC)).The maximum wavelengths of compound 1 were 278 and 430 nm. 1 H-dan 13 C-NMR data showed that compound 1 consisted of ten hydrogens and fifteen carbons. ESI-MS showed that the molecular weight was 285.96. It was predicted as 1,3,8-trihydroxy-2-methoxy-9,10-anthraquinone. It was firstly isolated from the ethyl acetate extract of C.officinalis bark.

Kepok banana peel is an organic waste that has potential to be reused. Several studies proofed that banana peels have antioxidant activity, antimicrobial, inhibit the formation of cholesterol crystals and gallstones, diuretic effect, and mutagenic effect. This study aims to identify secondary metabolites contained in kepok banana peels using qualitative test methods (phytochemical screening) and thin layer chromatography analysis. The results of the phytochemical screening of kepok banana peel indicated the presence of alkaloids, monoterpenes/sesquiterpenes, phenols/tannins, saponins,and quinones. Thin layer chromatographic profile of ethanol extract showed the presence of flavonoid, phenol, and quinone compounds.Keywords: Phytochemical, chromatography, banana peel

This research was conducted to determine the total oryzanol content of various extracts and bioassay-guided isolation of active anti-hypercholesterolemic agent from Indonesian rice bran. Hot solvent extraction was done by reflux method using single and binary solvents, namely hexane, chloroform, ethyl acetate, dichloromethane, isopropanol, acetone, hexane-ethyl acetate (1:1, v/v), hexane-isopropanol (1:1, v/v), and chloroform-ethyl acetate (1:1, v/v). TLC densitometric was used to quantitatively analyze the total oryzanol content in various extracts. The hexane extract was selected for fractionation and evaluated for their anti-hypercholesterolemic activity. The structure of an isolated compound was determined on the basis of NMR and Mass spectroscopy. The total oryzanol content was obtained using various solvents ranging from 27.92 to 43.59 mg/100g rice bran, in which hexane extract showed the highest amount (43.59 ± 3.36 mg/100g rice bran). β-sitosterol has been isolated from rice bran hexane extract, which shows a significant decrease in serum total cholesterol level. In summary, hexane is the best solvent to extract oryzanol compound using reflux method, and β-sitosterol was suspected to be responsible for anti-hypercholesterolemic activity in addition to existing compound such as oryzanol that contained in the rice bran.

Oryzanol has been reported to reduce serum total cholesterol (hypolipidemic agent) by inhibiting HMG-CoA reductase, an enzyme responsible for the metabolic pathway that produces cholesterol and isoprenoid. The purpose of this experiment is to determine the inhibition activity of oryzanol derivatives on HMG-CoA reductase by molecular docking. Four structure of oryzanol derivatives, Lanosteryl-ferulate, Brassicasteryl-ferulate, Lupeol-ferulate, and Cholesteryl-ferulate were used as ligands for molecular docking. The HMG-CoA reductase structure was obtained from protein data bank and the study was performed using AutoDock Tools as a molecular docking software. All oryzanol derivatives show binding affinity against HMG-CoA reductase. Lupeol-ferulate was predicted to be the best inhibitory activity against HMG-CoA reductase because of molecular docking.