Quercetin has been widely used to treat many diseases because of its high antioxidant activity. However, it has low oral bioavailability and penetration through the skin. The aim of this research was to enhance penetration and bioavailability of quercetin using transdermal ethosomal gel. Three ethosomal formulae, E1 (1 %), E2 (1.5 %) and E3 (2 %) with different concentration of quercetin were prepared using thin-film hydration method. Their physical properties were characterized, and then a selected ethosomal formula was incorporated into a gel dosage form. Two gels, one ethosomal and the other non-ethosomal were prepared. In vitro penetration using Franz diffusion cells and bioavailability study in Sprague Dawley male rats were carried out. Results showed that E2 was the chosen formula to be incorporated into the gel dosage form. According to the in vitro penetration study, the diffusion flux of quercetin from the ethosomal and non-ethosomal gels were 343.35±17.69 ng/cm 2 /h and 120.68±11.92 ng/cm 2 /h, respectively (P<0.05). In the bioavailability study, ethosomal gel showed higher maximum concentration (C max ) and area under curve (AUC 0-t ) when compared to non-ethosomal gel and oral suspension. C max from the ethosomal gel, nonethosomal gel, and oral suspension were 413.49±28.64, 189.46±49.68, and 61.92±14.31 ng/ml, respectively (P<0.05). AUC 0-t from the ethosomal gel, non-ethosomal gel, and oral suspension were 4035.15±560.60, 584.87±265.46, and 431.21±239.85, respectively (P<0.05). In conclusion, ethosomal gel could increase penetration and bioavailability of quercetin compared to non-ethosomal gel.

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Objective: To quantify 4-hydroxycyclophosphamide in cancer patients' plasma for therapeutic drug monitoring of cyclophosphamide. Methods:The blood was collected at 0.5 and 1 h after administration of chemotherapy. Prior to analysis, 4-OHCP in plasma was derivatized with semicarbazide HCl, then was extracted using 4 ml ethyl acetate and finally was determined by Ultra High-Performance Liquid Chromatographytandem mass spectrometry. Chromatographic separation was conducted using waters acquity BEH C18 column (1.7 μm; 50 mm x 2.1 mm). The mobile phase consisted of formic acid 0.1% and methanol (50: 50, v/v), column temperature 30 °C and flow rate of 0.3 ml/min. Mass detection was performed on waters xevo TQD equipped with an electrospray ionization (ESI) source at positive ion mode in the multiple reaction monitoring (MRM). Cyclophosphamide was detected at m/z 260.968>139.978, 4-hydroxycyclophosphamide-semicarbazide at m/z 338.011>224.97, and hexamethylphosphoramide as internal standard at m/z 180.17>92.08. Results:The method was linear in the range of 5-1000 ng/ml for cyclophosphamide and also for 4-hydroxycyclophosphamide. The results showed that the level of 4-OHCP in 39 cancer patients was in the range of 5.02 ng/ml to 832.44 ng/ml.Conclusion: 4-hydroxycyclophosphamide was detected on 39 patient samples with the lowest level of 5.40ng/ml and the highest level was 832.44 ng/ml. This can be a parameter that the regiment of cyclophosphamide was effective.

Aim: Determination of the bioequivalence of two metformin HCl (750 mg) caplet formulations (Glucophage XR® from Bristol-Myres Squibb Company, Indonesia as a reference formulation and Glumin XR® from Ferron Par Pharmaceutical, Indonesia as a test formulation). Material and method: The study was conducted according to an open label, randomized, Two-period crossover design with a 1 week washout period. Twelve volunteers participated and all completed the study successfully. Blood samples were obtained prior to dosing and at 1.0; 1.5; 2.0; 2.5; 3.0; 3.5; 4.0; 6.0; 8.0; 10.0; 14.0; 18.0; 24.0 and 30.0 hours after drug administration. Plasma will be separated by centrifuge and stored frozen at-20 degree Celcius. Plasma concentration of metformin HCl was monitored using high performance liquid chromatography (HPLC) with photo diode array (PDA) detection over a period of 30 hours after administration. The pharmacokinetics parameter AUC 0-30 h, AUC 0-∞ and Cmax were tested for bioequivalence after log transformation of data and ratios of Tmax were evaluated non parametrically. Result: The point estimates and 90% confidence interval for AUC 0-30 h, AUC 0-∞ and Cmax were 101.88 % (94.78-109.50%), 101.50% (93.77-109.87%) and 105.93 % (97.00-115.98%), respectively, satisfying the bioequivalence criteria of the European Committee for Proprietary Medicinal Products and The US Food and Administration Guidelines. Conclusion: These results indicate that two medications of metformin HCl are bioequivalent, thus, may be prescribed interchangeably.

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