Chitosan is a modified carbohydrate polymer obtained from the deacetylation of chitin and has good and unique characteristics, including its ability to be biodegradable, biocompatible, and nontoxic. The purpose of this study was to manufacture chitosan from freshwater lobster shells formulated in the form of a hand sanitizer gel that is stable and determine its antibacterial activity against Escherichia coli and Staphylococcus aureus. The chitosan obtained was then made into hand sanitizer gel preparations with concentrations of 1.5%, 3%, and 4.5%, and then an evaluation test was carried out on the hand sanitizer gel preparation, as well as antibacterial testing against E. coli and S. aureus. The results showed that the hand sanitizer preparation in the organoleptic test did not show any change in odor, shape, and color. The homogeneity test showed the absence of coarse granules. The results of the pH testing confirmed that the pH of the preparation was still within the permitted criteria limits. The dispersion test also showed the average is in the range of 5-7 cm so that the formula meets the requirements. The results of the antibacterial activity test of the chitosan hand sanitizer gel showed that it can inhibit E. coli bacteria with the best inhibition zone obtained at a concentration of 4.5% at 8.8 mm and S. aureus with the best inhibition zone at 10 mm.

The effect of particle size of fresh turmeric and simplicia toward content of curcumin compounds has been carried out. The purpose of this research is to analyze the content of curcumin compounds based on the particle size of the fresh turmeric and simplicia using ethanol and water solvents. Extraction of curcumin in fresh turmeric and simplicia yield was carried out by maceration method of electrosynthetic coupling in etanol and water solvent using the infundation method, at particle sizes of 20, 80 and 140 mesh. The content of curcumin compound was analyzed as quantitatively using spectrophotometry visible at 475 nm, the linier regression is Y = 6.428x-4.424 and R2 = 0.7594. The highest content of curcumin compound was found in the fresh turmeric and simplicia using ethanol solvent at 140 mesh particle size respectively, are 5.6 and 4.2 ppm. In water solvents, the concentration of curcumin from fresh turmeric and simplicia were 1.3 and 0.6 ppm, respectively.

Gaharu (Aquilaria malaccensis Lam.) is one of the natural ingredients that can be used as an antioxidant. Antioxidants are compounds that can inhibit free radical reactions in the body. Free radicals have an impact on the pathogenesis of several diseases in humans due to oxidative stress in cells. The purpose of this study was to determine the class of secondary metabolites of agarwood bark and antioxidant activity and to compare the value of IC50 (Inhibitory concentrations) of the methanol extract of agarwood bark with the IC50 of vitamin C in the DPPH method using UV-Vis spectrophotometry. The methanol extract of agarwood bark was macerated using methanol, then determined the content of secondary metabolites of Simplicia. The determination of antioxidant activity was carried out on the methanol extract of agarwood bark with the addition of DPPH at various concentrations. The sample concentrations were 20, 40, 60, 80, and 100 µg/mL.. As a comparison, vitamin C was used with concentrations of 4, 8, 12, 16 and 20 µg/mL.. Then they calculated percent attenuation (% inhibition) and the value of IC50. The results of the screening on the methanol extract of agarwood bark contained chemical compounds such as flavonoids, saponins, and tannins. The determination of antioxidant activity was carried out using a UV-Vis spectrophotometer with the DDPH method. The results were obtained from the methanol extract of the bark of agarwood, which has antioxidant activity in the strong category with an IC50 value of 94.59 µg/mL.and vitamin C in the very strong category with an IC50 value of 22,11 µg/mL.

Shellfish is one of Indonesia's fishery commodities which is increasing every year, one of which is blood clams and feather shells, which are easily found in Southeast Asia and East Asia. Shellfish also have great potential so that it has an impact on the increasing waste that is allowed to accumulate without any handling of the pollution that exists in the environment and society. One alternative to the use of waste from feather shells to have a high use value is to isolate it into chitosan. The purpose of this study was to investigate the utilization of shellfish waste into chitosan and to determine the LC50 value of the chitosan produced. The analysis carried out was the toxicity test of chitosan from shellfish shell waste on Artemia salina Leach shrimp larvae using the Brine Shrimp Lethalitiy Test (BSLT) method with various concentrations of 100; 250; 500; 750; and 1000 µg/mL, and determining the value of LC50 by probit analysis. Based on the results of the toxicity test of chitosan from shellfish waste, the LC50 value was µg/mL. These results indicate that chitosan from shellfish waste has no toxic effect on Artemia salina Leach shrimp larvae.

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