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All Journal Jurnal Sains dan Teknologi Farmasi
Agusri Boestari
Jurusan Farmasi FMIPA, Universitas Andalas, Padang
Computer Science & IT Education

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Kajian Biodegradasi Filem Plastik Campuran Polimer Sintetik dengan Biopolimer dalam Larutan Air Octaviani, Melzi; Dewi, Asiska Permata; Boestari, Agusri; Zaini, Erizal; Djamaan, Akmal
Jurnal Sains dan Teknologi Farmasi Vol 17 No 1 (2012)
Publisher : Fakultas Farmasi Universitas Andalas

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A study on degradation of plastic film of the mixture of polystyrene sintetic polymers (PS) with poli(3-hidroxyibutirat) [P(3HB)] dan poli(3-hidroksibutirat-ko-3-hidroxyvalerat) [P(3HB-ko-3HV)] biopolymers in-vitro and in-vivo has been done. The assay was done by immersion test method in aquadest, river water at various pH of 4,6,8, and 10 respectively. Degradation rate was determined by linear regression with parameters including : t 50%, t 95% and rate constant (k). Degradation rate of plastic film of 1 PS/P(3HB) 95:5 at pH 6 was the fastest with k = 0,79 % week, t 50 % = 63,06 week and t 95 % = 119,84 week, followed by PS/P(3HB) 90 : 10 with k = 1,22 % / week, t 50 % = 41,25 week and t 95 % = 78,21 week and PS/P(3HB) 80 : 20 with k = 3,16 % week, t 50 % = 15,81 week and t 95 % = 30,05 week while pure PS plastic film (100 : 0 ) did not degraded at all. The degradation rate of a mixture of plastic film in river water, PS/P(3HB-ko-3HV) 95:5 showed k= 0,64 % week, t 50 % = 82,63 week and t 95 % = 157,17 week, PS/P(3HB-ko-3HV) 90:10 with k = 0,69 % week, t 50 % = 72,16 week and t 95 % = 137,4 week ; PS/P(3HB-ko-3HV) 85:15 with k = 0,74 %/week, t 50% = 66,79 week and t 95% = 127,32 week, while the pure PS plastic film (100:0) did not degrade.
Penetapan Kadar Fenolat Total dan Uji Aktivitas Antioksidan Ekstrak Kulit Segar Buah Manggis (Garcinia Mangostana Linn.) Zulharmita, Zulharmita; Prajuwita, Mia; Boestari, Agusri
Jurnal Sains dan Teknologi Farmasi Vol 15 No 1 (2010)
Publisher : Fakultas Farmasi Universitas Andalas

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The determination of totally phenolic compounds in methanol extracted of cortex fruit of Garcinia manggostana Linn has been done by Folin-Ciocalteau method. The antioxidant activity has been performed using 1,1-diphenyl-2-picrihydrazil (DPPH) as reagent, that measured spectrometrically compared with gallic acid as antioxidant standard compound. The total phenolate compounds found in fresh peel of mangosteen was 1,64±0.18% w/w which calculated as gallic acid equivalence and the antioxidant activity with a value of IC50 was 251,12 μg.
Co-Authors Akmal Djamaan Asiska Permata Dewi Erizal Zaini Melzi Octaviani Mia Prajuwita Zulharmita Zulharmita