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"Dengan semakin banyak beredarnya campuran asam asetil salisilat dan asam askorbat dalam sediaan tablet efervesen, maka perlu dikembangkan suatu metode yang sensitif dan mudah didalam menganalisis kadar sediaan tersebut. Metode yang digunakan adalah Kromatografi CairKinerja Tinggi (KCKT) dengan menggunakan kolom C-18 ODS (3,9 mm x 300 mm); detektor UV-Vis (panjang gelombang 280 nm); fase gerak asetonitrildapar fosfat pH 3,5 (30:70, v/v) dengan laju alir 1,2 mL/menit.Parameterparameter analitik menunjukkan bahwa metode ini dapat digunakan untuk menetapkan kadar asam asetil salisilat dan asam askorbat secara bersamaan. Pada penetapan kadar sampel diperoleh hasil kadar asam asetil salisilat 94,59 ± 1,33% dan kadar asam askorbat 104,58 ± 1,01%."

"ABSTRAKGlukosamin hidroklorida dan kondroitin sulfat merupakan senyawa glikosaminoglikan (GAGs) yang merupakan komponen struktural utama dari tulang yang akan membentuk proteoglikan. Kedua senyawa ini dapat merawat kesehatan tulang dengan menstimulasi sintesis cairan sinovial dan menghambat degradasi kartilage persendian, sehingga dapat digunakan untuk terapi osteoartritis. Penelitian ini bertujuan untuk memperoleh metode analisis yang selektif untuk penetapan kadar glukosamin hidroklorida dan kondroitin sulfat dalam sediaan tablet dan krim. Setelah diderivatisasi menggunakan pereaksi ortoftalaldehida dan 2-merkaptoetanol (OPA/2-ME), sampel dianalisis menggunakan kromatografi cair kinerja tinggi (KCKT) dengan detektor fluoresensi pada panjang gelombang eksitasi 335 nm dan panjang gelombang emisi 445 nm. Glukosamin mempunyai gugus amin primer sehingga dapat diderivatisasi dengan OPA/2-ME, sedangkan kondroitin mempunyai gugus asetil pada gugus amin, sehingga perlu dilakukan deasetilasi menggunakan natrium hidroksida untuk memutus gugus asetil. Fase gerak yang digunakan tetrahidrofuran 0,25% dalam air-asetonitril (87:13) dengan laju alir 1,5 mL/menit. Kondisi analisis yang telah dioptimasi kemudian divalidasi mencakup akurasi, presisi, linieritas, selektivitas, batas deteksi, dan batas kuantitasi. Hasil menunjukkan kadar rata-rata glukosamin hidroklorida dan kondroitin sulfat pada sediaan tablet dan krim adalah 92,76%; 96,11% dan 101,15%; 100,33% memenuhi syarat keberterimaan.

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ABSTRAKGlucosamine hydrochloride and chondroitin sulphate are glycosaminoglycans (GAGs) compound which is a major structural component of bone that form proteoglycans. Both of these compounds can take care of bone health by stimulating the synthesis of synovial fluid and inhibit the degradation of joint cartilage, so it can be used for the treatment of osteoarthritis. The aimed of this study were obtain selective analytical method for the determination of glucosamine hydrochloride and chondroitin sulphate levels in tablet and cream dosage forms. After derivatization using orthophtalaldehyde and 2-mercaptoethanol (OPA/2-ME), samples were analyzed using high performance liquid chromatography (HPLC) with fluorescence detector at excitation wavelength of 335 nm and emission wavelength of 445 nm.. Glucosamine has a primary amine group that can be derivatized with OPA/2-ME, while chondroitin having an acetyl group at the amine group, so we needed deacetylation using natrium hydroxide to break the acetyl group. The mobile phase used tetrahydrofuran 0.25% in water-acetonitrile (87:13) with a flow rate 1.5 mL/min. Analysis conditions have been optimized, validated in terms of accuracy, precision, linearity, selectivity, limit of detection, and limit of quantitation. The results showed average levels of glucosamine hydrochloride and chondroitin sulphate in tablet and cream dosage forms were 92.76%; 96.11% and 101.15%; 100.33% and fulfilled the acceptance criteria."

"As the food and beverages industry grows in Indonesia, there also has been an increase in the soft-drinks production in the society. There are elements often added into the drinks; such as caffeine, artifical sweetener and preservatives,which the content should be monitored. Because, if they are over-used, they will be hazardous to health. The purpose of this research is to obtain the optimum analysis condition for determining the content of saccharin, aspartame, benzoic acid, sorbic acid and caffeine, which are in the soft-drinks, using the reversed phase High-Performance-Liquid-Chromatography (HPLC). In this study, the condition used are Latek 18 column (15 cm x 4.0 mm), mobile phase as a mixture of acetonitrile and acetat buffer pH 5(5:95), flow rate 1,0 ml/minutes and detected by a 254 nm length-wave. The detection limit discovered by this method are for saccharin, benzoic acid, sorbic acid, caffeine and aspartame, respectively, are 0,2 ppm; 0,2 ppm; 0,007 ppm; 0,142 ppm; and 6,5 ppm. Whereas, the quantitative limit for saccharin, benzoic acid, sorbic acid, caffeine and aspartame, respectively, are 0,689 ppm; 0,852 ppm; 0,027 ppm; 0,452 ppm; 25,2 ppm. The calibration curve ranged between 1-60 ppm for saccharin and benzoid acid, 1-40 ppm for caffeine, 0.05-2 ppm for sorbic acid, and 30-100 ppm for aspartame. The investigation has been done for five (5) brands od soft-drinks. The analysis results are sample A contains caffeine 96,66 ppm, sample B contains saccharin 112,13 ppm, benzoic acid 206,81 ppm, and caffeine 130,63 ppm. Sample C contains benzoic acid 10,83 ppm and caffeine 97,66 ppm. Sample D contains benzoic acid 163,78 ppm, caffeine 101,52 ppm, and aspartame 231,20 ppm. The amounts of saccharin, benzoic acid, caffeine, and aspartame which has been found in the sample, do not exceed the tolerance limit of usage, whereas the amount of benzoic acid which has been found in sample B exceed the tolerance limit of usage."

"Asetosal sebagai obat antiplatelet mudah terhidrolisis menjadi asam salisilat setelah pemberian oral. Pemantauan asam salisilat sebagai metabolit utama dalam plasma bersama asetosal sebagai senyawa induk dapat dilakukan melalui studi farmakokinetika. Sebelum melakukan studi farmakokinetika, metode bioanalisis harus tervalidasi. Salah satu parameter validasi metode bioanalisis adalah uji stabilitas jangka panjang secara in vitro di dalam plasma. Akan tetapi, uji tersebut tidak menggambarkan kondisi stabilitas in vivo karena adanya proses metabolisme obat di dalam tubuh. Penelitian ini bertujuan untuk menganalisis stabilitas in vivo incurred sample stability asetosal dan asam salisilat dalam plasma 6 subjek sehat pada hari ke-7, 14 dan 25 pada fase Cmax dan fase eliminasi. Analisis asetosal dan asam salisilat dilakukan terhadap 6 subjek sehat yang mengkonsumsi tablet asetosal 80 mg. Pengambilan darah subjek dilakukan sebanyak 12 titik pada beberapa interval waktu hingga jam ke-24. Kondisi kromatografi optimum yang digunakan adalah kolom C18 Waters, Reliant ? 5 m, 250 mm x 4,6 mm ; suhu kolom 35oC; fase gerak asetonitril ?? dapar fosfat pH 2,5 35 : 65 v/v ; laju alir 1,0 mL/menit; detektor UV-Vis; panjang gelombang 230 nm; dan furosemid sebagai baku dalam. Hasil incurred sample stability untuk asetosal dan asam salisilat sampai hari ke-25 pada 6 subjek menunjukkan stabilitas yang memenuhi persyaratan EMEA bioanalytical guideline tahun 2011 yaitu nilai diff tidak lebih dari 20.

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Acetosal as an antiplatelet drugs is rapidly hydrolyzed to salicylic acid after oral administration. Monitoring salicylic acid as the main metabolite in plasma together with acetosal as a parent compound can be performed through pharmacokinetics studies. Before pharmacokinetics studies, the method of bioanalysis should be validated. One of the validation parameters of the bioanalytical methods is long term stability test of in vitro in plasma. However, the analysis can t describe in vivo stability condition due to the metabolism of drugs in the body.

This study aims to analyze the in vivo stability incurred sample stability of acetosal and salicylic acid in plasma on days 7, 14 and 25 in the Cmax phase and elimination phase. Acetosal and salicylic acid analysis were performed on 6 healthy subjects who consumed 80 mg acetosal tablets. Blood sampling on the subjects will be taken in 12 points at several times for to 24 hours.

The optimum chromatographic conditions that used were C18 columns Waters, Reliant 5 m, 250 mm x 4.6 mm column temperature 35oC mobile phase was acetonitrile phosphate buffer pH 2.5 35 65 v v flow rate was 1.0 mL min UV Vis detector at wavelength of 230 nm and furosemide as internal standard. The diff values of acetosal and salicylic acid incurred sample stability until day 25 on 6 subjects not more than 20 , which fulfilled the acceptance criteria of validation method based on EMEA Bioanalytical Guideline 2011."