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All Journal Jurnal Ilmu Pertanian Indonesia Jurnal Riset Kimia
Hendra Adijuwana
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Agriculture, Biological Sciences & Forestry Chemistry

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DEGRADASI POLIBLEND POLI(ASAMLAKTAT-KO-ASAMGLIKOLAT) DENGAN POLI(ε-KAPROLAKTON) SECARA IN VITRO Kemala, Tetty; Sjahriza, Achmad; Adijuwana, Hendra; Hardianti, Mardiana
Jurnal Riset Kimia Vol 2, No 2 (2009): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v2i2.158

Abstract

 ABSTRACT  Polymer has many applications in human life, one of them is in the field of health. Polymer synthetics like polylactic acid (PLA), polyglycolic acid (PGA), poly(ε-caprolactone) (PCL), and poly(lactic acid-co-glycolic acid) (PLGA) were kind of polyesters that is many used in field   of health. Many researchers have already made research about degradation of PLA, PGA, PCL, and PLGA. However, there is no one doing research about degradation of combination between this two polymers, one of them is polyblend of  PLGA and PCL. Polyblend were made of four compositions, that were PLGA(90:10):PCL 3:1, PLGA(75:25):PCL 3:1, PLGA(90:10):PCL 5:1, and PLGA(75:25):PCL 5:1. Degradation was carried out for eight weeks by using phosphate buffer pH 7.4 and incubation temperature of 37°C. Degradation of the polymer was observed by mass remained, and intrinsic viscosity. The result showed that composition PLGA(75:25):PCL 5:1 was the fastest in degradation compared to other compositions. It was showed by the decrease in mass until 89.06% and the change in intrinsic viscosity until 20.13%. Keywords: PLGA, PCL   
Mekanisme dan Faktor Kimia yang Mendasari Resistensi Beberapa Varietas Padi Terhadap Wereng Batang Coklat Nilaparvata Lugens Stal (Homoptera: Delphacidae) Syafrida Manuwoto; Hendra Adijuwana
Jurnal Ilmu Pertanian Indonesia Vol. 1 No. 1 (1991): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Abstract

The brown planthopper (BPH) Nilparvata lugens Stal (Homoptera: Delphacidae) is one of the most important rice pest in Indonesia. Integrated pest management (IPM) is the only way of controlling the BPH. The use of resistant varieties is an important component of IPM. The development of BPH biotypes and agricultural practises cause the resistant varieties become susceptible in only 4-6 growing seasons. Understanding BPH - rice plant interactions are necesary. This greenhouse and laboratory studies were to unravel the mechanism and plant chemicals that might play a role in rice plant resistance of selected rice varieties: Cisadane, IR36, IR48, IR64, IR56, Kelara, and Bahbutong. Pelita I-I was used as susceptible check. The BPH colony originating from catches in 1986 in Yogyakarta was used in this study. Various experiments were carried out: evaluation of plant damage, the preference of BPH for feeding and ovaiposition, and population development study. The plants contens of protein, amino acids, water, potassium, calcium, and silica were measured. The mechanism of plant resistance to BPH on IR36, IR48, IR56, IR64, Kelara, and Bahbutong were identified as non-preference and antibiosis. The antibiosis mechanism was more prominent in IR48 and Bahbutong. The plant content of protein, potassium, calcium, and silica may take part in the basis of resistance mechanism. Further studies will be carried out.
DEGRADASI POLIBLEND POLI(ASAMLAKTAT-KO-ASAMGLIKOLAT) DENGAN POLI(ε-KAPROLAKTON) SECARA IN VITRO Tetty Kemala; Achmad Sjahriza; Hendra Adijuwana; Mardiana Hardianti
Jurnal Riset Kimia Vol. 2 No. 2 (2009): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v2i2.158

Abstract

 ABSTRACT  Polymer has many applications in human life, one of them is in the field of health. Polymer synthetics like polylactic acid (PLA), polyglycolic acid (PGA), poly(ε-caprolactone) (PCL), and poly(lactic acid-co-glycolic acid) (PLGA) were kind of polyesters that is many used in field   of health. Many researchers have already made research about degradation of PLA, PGA, PCL, and PLGA. However, there is no one doing research about degradation of combination between this two polymers, one of them is polyblend of  PLGA and PCL. Polyblend were made of four compositions, that were PLGA(90:10):PCL 3:1, PLGA(75:25):PCL 3:1, PLGA(90:10):PCL 5:1, and PLGA(75:25):PCL 5:1. Degradation was carried out for eight weeks by using phosphate buffer pH 7.4 and incubation temperature of 37°C. Degradation of the polymer was observed by mass remained, and intrinsic viscosity. The result showed that composition PLGA(75:25):PCL 5:1 was the fastest in degradation compared to other compositions. It was showed by the decrease in mass until 89.06% and the change in intrinsic viscosity until 20.13%. Keywords: PLGA, PCL   
Co-Authors Achmad Sjahriza Mardiana Hardianti SYAFRIDA MANUWOTO Tetty Kemala