Judul: Kajian Residu Beta Laktam dalam Susu Pasteurisasi Impor dari Australia melalui Pelabuhan Udara Soekarno-Hatta
Abstrak: Beta-lactam antibiotic residue occurs in pasteurization milk due to application of beta-lactam antibiotic in dairy cattle treatment. The residue does not only create problems in dairy industry but also have impact on public health. The aims of the study were to determine the presence and the amount of beta-lactam antibiotic in imported pasteurization milk. Sample size was calculated using the formula to detect disease according Canon and Roe (1982) cited by Martin et al. (1987). The sixty samples of imported pasteurized milk from Australia were used in this study. The bioassay (screening test) was used and followed by confirmation test used high performance liquid chromatography (HPLC). Both of the tests showed negative result. It means all of the samples did not contain beta-lactam antibiotic.
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Judul: Analsis Residu Antibiotika dalam Daging Sapi yang Diimpor melalui Pelabuhan Tanjung Priok
Abstrak: Antibiotics are natural products of a microorganism, identical synthetic products or similar semi synthetic products that inhibit the growth of or destroy microorganisms. In veterinary medicine antibiotics are used for therapeutic, prophylactic, metaphylactic and nutritive purposes. The presence of antibiotics or their metabolites in food is potentially hazardous to health as it may cause allergic reactions in people and antibiotic resistance in pathogenic microorganisms. In addition antibiotics may influence starter cultures in food industry and lead to economic damage. The aims of this research were to detect antibiotic residue in imported beef and to analyze the effectivenes of rapid test as screening method to detect antibiotic residue in imported beef as a part of quarantine inspection. Samples size was calculated using detect disease formula and selected by random sampling. Datas regarding the proportion of antibiotic positive samples were analyzed descriptively. Rapid test showed that, 24 of the 70 samples (34.29%) contained antibiotic residue, while 17 (24.29%) samples contained antibiotic residue detected by using bioassay. Bioassay showed that samples contained beta lactams, tetracycline, macrolide, and aminoglycoside.
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Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4