Objective: This study was intended to optimize the extraction condition using central composite design.Methods: Central composite cesign with three independent variables, namely water temperature, brewing time, and brewing number were used to obtain the optimum extraction condition. Two dependent variables, namely yield of extraction and epigallocatechingallate level were used as a response parameter. Epigallocatechin gallate level was determined by using high-performance liquid chromatography method.Results: Extraction yield was varied from 0.30 g to 0.72 g. All variables, namely water temperature, brewing time, and brewing number were able to increase the extraction yield. Epigallocatechingallate level was varied from 190.23 mg/g to 301.74 mg/g. Water temperature, brewing time, and both interaction were able to increase the epigallocatechin gallate level in green tea extract.Conclusion: Optimum extraction condition was shown using hot water at a temperature of 95 °C for 20 min and two-times infusions. The condition obtained extraction yield and epigallocatechingallate of 0.70 g and 286.87 mg/g dry weight, respectively.

Aim: This study was aimed to formulate a transdermal matrix patch using green tea leaf extract. Materials and methods: The transdermal matrix patch formulation was optimized by the simplex lattice design method. The correlation between responses was analyzed using chemometrics. The observed responses were: 1. the physical properties of the matrix patch, and 2. the percentage of dissolution efficiency of catechins, caffeine, and epigallocatechin gallate released from the patch. The determination of drug release kinetics was based on the curve-fitting analysis using zero-order, first-order, Higuchi, and Korsmeyer-Peppas models. Results: The results showed that the optimal formula was obtained using the mixture of HPMC K100, HPMC K4M, and PEG 400 at a ratio of 4.0: 4.5: 0.5. The principal component analysis (PCA) showed that %DE300 values of catechin caffeine and epigallocatechin gallate positively correlate. A similar condition was observed between the weight and thickness of the matrix. Drug release kinetics follows the Korsmeyer-Peppas model.

Green tea (Camellia sinensis L.) contains bioactive compounds such as epigallocatechin gallate (EGCG), caffeine, and gallic acid. The study aimed to optimize the extraction condition using the experimental design of factorial design. Two variables namely water temperature (75 and 95 o C) and brewing number (one and two-times) were used and objected to factorial design in order to get the optimum condition. The determination of EGCC, caffeine, and gallic acid was carried out using high-performance liquid chromatography method equipped with the UV-visible detector. The result showed that the extraction yield varied from 4.48%-7.56%. The level of EGCG and caffeine in green tea extract varied from 251.96-393.34 mg/g dry weight and 32.94-46.82 mg/g dry weight, while the level of gallic acid could not be quantified in each experiment because it was below the limit of quantification (LOQ). The predicted optimum extraction condition consisted of water temperature at 95 o C with two-times brewing. Using this optimum condition, the concentrations of EGCG, caffeine and the extraction yield were of 356.43 mg/g dry weight, 38.76 mg/g dry weight, and 5.76%, respectively.

Heroine is hydrolyzed spontaneously in water and plasma. This will influence the determination, especially on the drug profiling. Spectrophotodensitometry has been used to analyze drug profiling of illicit heroine. This article reports the AL-TLC separation of heroine, 6-monoacetylmorphine (6-MAM), morphine, acetyl codeine, and the heroine hydrolysis in water and plasma. Heroin, 6-MAM, morphine, and acetyl codeine can be well-separated by mobile phase of toluene:siclohexane:diethyl amine (75:15:10, v/v). The limit of detection was 165.16 ng/spot and the limit of quantification was 550.55 ng/spot. Heroine was hydrolyzed in water and plasma under first order reaction. The rate of reaction was 0.55 min-1 in water with the half time reaction of 12.47 minutes. On the other hand the hydrolysis rate in plasma was slower with the half time of 16 minutes.   Keywords : hydrolysis, heroin, water, TLC-spectrophotodensitometer

Arabica coffee (Coffea arabica L.) kintamani is a superior agricultural product from Bali. Arabica coffee (Coffea arabica L.) contains many compounds, one of which is caffeine which is beneficial for health and beauty. This study aims to formulate kintamani arabica coffee beans into a gel dosage form. The optimization formula of kintamani arabica coffee bean gel was made using the D-Optimal method using a combination of HPMC and propylene glycol as observation variables and spreadability, pH, and viscosity of the gel preparation as experimental responses. The study of caffeine from the gel preparation was carried out using a Franz diffusion cell. Caffeine content in the gel preparation and its release are determined by spectrophotometric method. The results showed that the amount of HPMC used would increase the viscosity value (+14113.92) and decrease the spreadability (-0.29) and pH (-6.59167E-003) of the gel. The greater the amount of propylene glycol used will decrease the viscosity value (-2484.54) and increase the spreadability value (+0.30) and pH (+0.31802) of the gel. The conclusion of this study is the use of a combination of HPMC and propylene glycol (6%:17%) resulted in the optimum formula with a viscosity value of 44,070 cps, a spreadability value of 3.6 cm, and a pH value of 5.32. The caffeine content obtained in the gel preparation was 188.47 g and the amount of caffeine released from the gel preparation for 6 hours of testing was 4.95%.