Cantigi is an endemic plant of sub-alpine area of Mount Tangkuban Parahu in Bandung, Indonesia. Previous study showed ethanol extract of young red leaves had antioxidant activity, however no information on this activity if changed into nanoparticles. The purpose of this study was to determine the effects of gelatin and glutaraldehyde concentrations on the characteristics of Cantigi extract loaded gelatin nanoparticles and to evaluate the antioxidant activity of nanoparticles. Cantigi leaves were extracted by maceration using n-hexane, ethyl acetate, and ethanol 96%. The ethanol extract was dried, made into nanoparticles by varying gelatin (0.1; 0.2; and 0.3 g) and glutaraldehyde (0.1; 0.2; and 0.3 mL) amounts, and conducted at 500 rpm and 40 °C for 3 hours. Nanoparticles were evaluated for particle size, zeta potential, morphology, and antioxidant activity. Nanoparticles with glutaraldehyde amount variation had particle sizes (PS) of 105.9±26.2; 37.1±8.7; and 32.5±7.4 nm; polydispersity indeces (PI) of 0.508; 0.717; and 0.563; zeta potential values (ZPV) of 0.55; 0.89; and 0.78 mV; and antioxidant activities (IC50) of 56.15±0.16; 53.67±0.10; and 51.57±0.39 ppm, respectively. Then, nanoparticles with gelatin amounts variation had PS of 22.5±5.1; 37.1±8.7; and 83.3±21 nm; PI of 0.604; 0.717; 0.326; ZPV of 1.27; 0.89; 0.18 mV; and antioxidant activities of 51.58±0.19; 53.67±0.12; and 55.46±0.04 ppm, respectively. Nanoparticle morphology was spherical. Cantigi leaf extract can be made into gelatin nanoparticles; the smaller the concentration of the polymer used and higher the concentration of the glutaraldehyde, the smaller the resulted particle size and increased antioxidant activity. Antioxidant activities of nanoparticles was lower than those of the extract (IC50 16.84±0.30 ppm).

Advantages of Cantigi (Vaccinium varingiaefolium Miq.) include anti-inflammatory, Spasmolytic, Antiviral, and Hypotensive Properties. The objective of this study was to standardize the Cantigi leaf extract. Non-specific parameters include total ash content, acid insoluble ash content, water content, dry loss, determination of heavy metals (Hg, As, Cd, Pb, hydroquinone), mold number, yeast, total plate count, and solvent residue. Specific parameters included extracts soluble in ethanol and water. Cantigi leaves are extracted by kinetic maceration using solvents such as n-hexane, ethyl acetate, and 96% ethanol. To obtain a thick extract, 96% ethanol extract was evaporated using a rotary evaporator. The experiment produced 44.5 g of the cantigi leaf extract in 96% ethanol. Phytochemical screening presents alkaloids, saponins, tannins, flavonoids, triterpenoids, steroids, essential oils, and quinones. Ethanol soluble extract was 9.49% and that of the water-soluble extract was 22.21%. A total of ash 3.66%, an acid insoluble ash 0.35%, water content 6.31%, and drying loss 6.49%. Results of the heavy metal contamination test revealed that no traces of Hg, As, Cd, Pb, or hydroquinone were found, along with 10 yeast molds, 10 plates, and 0.005% residual ethanol solvent. Based on the results, cantigi leaf extract met the standard of extract quality.