Jurnal Kimia Terapan Indonesia (Indonesian Journal of Applied Chemistry)
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The Analysis of Pulsed Electromagnetic Field Effect on Solution Conductivity
No full textThis paper presents the observation of magnetization process variableswhich influenced the conductivity of FeSO4, MnSO4, MgCl2 and CaCl2solution. Some of the survey results revealed that there was a decrease inthe rate of particle formation of FeSO4, MnSO4, MgCl2 and CaCl2 of theions in the sample of the magnetized hard water. This study compared theconductivity of FeSO4, MnSO4, MgCl2 and CaCl2 solution before and afterthe pulsed electromagnetic field with a concentration level of 0.1 M wasgiven. Electromagnetic Water Treatment (EW) was used to generate theelectromagnetic pulse wit 9.3 mT pulsed electromagnetic filed. Tools Themeasurement of solution conductivity level conducted using BenchConductivity Meter was calibrated by Control Company with certificatenumber 4163-4997748 and traceable to the National Institute of Standardsand Technology. The measurement was conducted by observing the timefunction of solution conductivity of FeSO4, MnSO4, MgCl2, and CaCl2.The results showed that pulsed electromagnetic fields affected theconductivity of FeSO4 and CaCl2 solution by74% and 67%, respectively.Meanwhile, the lower conductivity was observed from MnSO4 and MgCl2solution with 6% due to process of magnetization which caused theinstability of the ionic bonding in the solution
DAYA INHIBISI TRIPSIN BEBERAPA EKSTRAK TANAMAN SUKU LEGUMINOSA
No full textIn search of potensial protease inhibitor, especially those which inhibit trypsin activity, preliminary screening of some plant extracts of Legumlnoceae family has been carried out. From 9 (nine) plant extracts examined, those which gave potential enzyme inhibition, were leaf and bark extracts of Caesalpinia pulcherima, and Caliandra chaemotocepala, and bark extract of Delonic regia, Leucaena glauca, and Sesbanla grandlflora . Thin layer chromatographic analysis of the leaf and barkextracts of the plants considered to have the most potensial inhibitor activity indicated that the active principles were of peptide and polyphenollc compounds
EVALUASI NILAI GIZI SECARA BIOLOGI DENGAN TETRAHYMENA PYRIFORMIS GL, UNTUK BEBERAPA INTISARI JENIS KACANGKACANGAN
No full textBioassay using Tetrahymena pyriformis GL was applied to evaluate the nutritive value of soybean (Glycine max), lablab (Lablab purpureus), lamtoro sabrang (Acacia spy, orok-orok (Crotalaria sp) and turi (Sesbania grandiflora). The beans were tested either before or after being fermented with Rhizopus oligosporus Ub. Pepsin was used ill predigestion of the samples for the assay. It was found that cooked and fermented soybean, lablab and orok- orok had the relative nutritive value (RNV) approximating that of casein standard which had been set at a value of 100. Cooked lamtoro sabrang and turl had the RNV lower than that of the casein standard, i.e. 67 % and 22 % respectively before fermentation with Rhizopus oligosporus Ub. However, despite the fact that no change was found ill the RNV of lamtoro sabrang there was an improvement in the RNV of turi after fermentation, i.e from 22% t044 %
EFFECTS OF TRACE METALS AND MEDIUM COMPOSITION ON THE GROWTH OF Aspergillus niger ATCC 11414, IN A SUBMERGED CULTURE
Get PDFIn an attempt to optimize citric acid fermentation, a study has been conducted to determine optimum nutritional conditions for the growth of Aspergillus niger ATCC 11414. The objective of the study was to obtain information on the growth of this strain in a submerged culture for the study of citric acid production The following article summarizes the results of study on the effects of trace metals and composition of chemically defined medium on mycelial growth of A.niger ATCC 11414. Chemically defined media containing glucose as the carbon source and energy were used throughout the work. Growth experiments were carried. Out by a submerged culture process, in a 300-ml Erlenmeyer flask which contained 50ml liquid medium. The process was conducted at 30C for 4 days in an orbital shaker incubator operated at 200 rpm. The cultivation process was followed by monitoring the changes in the culture medium of the concentrations of biomass, total reducing sugars, citric acid, and pH of the medium. It was concluded that copper (II), iron (II), zinc (II), and manganese (II) ions had a remarkable effect on the growth of A. niger ATCC 11414. With 5% glucose, the study showed that 5 - 15 ppm copper, 0.5 - 25 ppm iron and 0.5 - 25 ppb manganese ions were optimal for the growth of the strain. The growth of the strain increased with the increase of Zn2+ added (0.5 - 25 ppm). The most optimal medium for the growth of A.niger ATCC 11414 was found to be able to produce more than 16 g of dry weight of biomass for 50 g glucose
RADIONUCLIDIC IMPURITIES IN PERTECHNETATE SOLUTION ELUTED FROM 99mTc-CHROMATOGRAPHIC GENERATOR LOADED WITH 99Mo-FISSION PRODUCT
Get PDFMedical radioisotope of 99mTc was firstly produced in Indonesia through the nuclear reaction of 98Mo (n;y) 99Mo -> 99mTc. The separation of the resulting 99mTc from the postirradiated natural MoO3 was carried out by solvent extraction using methyl ethyl ketone. Instead of this method, Radioisotope Production Center (RPC) BATAN has routinely produced 99mTc-chromatographic generator loaded with 235U-flSsion-produced 99Mo to provide 99mTc. By such generator, 99mTc can be easily and repeatedly liberated in the form of pertechnetate by vacuum elution using saline solution. Some fission- produced radionuclides, however, potentially contaminate the pertechnetate fraction. Gamma spectrometric determination was carried out to evaluate the level of radionuclidic impurities contaminating 99mTc-pertechnetate solution eluted from 99mTc- chromatographic generator produced over a 10-month period in 1993 - 1994. Radioactivity yield of the resulting 99mTc was independent to the origin of the loaded 99Mo. The 99mTc-pertechnetatate fractions were frequently contaminated with 99Mo, 131I and 103Ru, but the contamination did not exceed maximum permissible level. The fluctuation of contamination level may be influenced by irradiation parameters and separation techniques applied to the production of the loaded 99Mo
POKOK-POKOK DALAM ANALISA MIKROBIOLOGI PANGAN*) Sebuah Tinjauan
Get PDFMicroorganisms in foods not only can deteriorate the quality and shelf life of foods, but also capable of producing food poisoning. Therefore, microbiological analysis of foods is essentia, particularly to establish safety, to secure adequate microbiological quality and for standardization of food products.The existence of microbial pollution in foods needs standard microbiological analysis of foods to obtain accurate results of analysis. This is due to the fact that beside the complex nature of foods, the number of factors affecting the results of analysis are innumerable such as food age, sampling methods and treatment of the samples, and the methods of analysis used. In framing me/hods for the microbiological analysis of foods consideration must be given not only to the phycical and chemical properties of the food, but also to the form of processing they have recieved, the types of pathogens or spoilage organisms likely to be of most importance and the number likely to be present. This paper presents a review on the fundamentals of microbiological analysis of foods to clarify the various microbiological aspects, background and the principles outlay the works of microbiological analysis offoods and their problems.This paper presents a review on the fundamentals of microbiological analysis of foods to clarify the various microbiological aspects, background and the principles outlay the works of microbiological analysis of foods and their problems
PENGARUH BERAT MOLEKUL ADITIF PADA PENAMPANG MELINTANG DAN KARAKTERISTIK MEMBRAN SERAT BERONGGA POLISULFON, YANG DIAMATI DENGAN ALAT SCANNING ELECTRON MICROSCOPY
No full textCross section of polysulfone membranes hollow fiber spun bydry - wet process have been studied. Composition of membraneobserved composed of 16% Polysulfone (PS) , 64% dimethylAcetamide (DMAc) as solvent and 18% Polyetylene glycol (PEG)as additive. Molecular weight of polyetylene glycols used were 200,300 and 400 Daltons. Fiber of membranes were charaterized bydextrane solution to find rejection coefficient and molecular weightcut - off of the membrane. Cross sections of hollow fiber membraneswere observed by Scanning Electron Microscopy (SEM).Results of the experiment show that, molecular weight ofpolyethylene Glycol additif used in spinning of hollow fibermembrane affects form of cross section of substructure andmolecular weight cut - off the membrane obtained. This researchwas aimed to predict the pore size of membrane made based onmolecular weight of additive used
KOTORAN TERNAK SEBAGAI INOKULUM PADA PENGOLAHAN AIR LIMBAH PABRIK GULA SECARA BIOLOGI-AEROB
No full textA study on the treatment of Sugar Factory wasted water by using biological aerobic process was carried out at a laboratory sacle. Cow dung and chicken dung were used as inoculum to raduce the organic compounds is waste water. The levels of inoculum concentration used were 5; 10; 15; 20; and 25 per cent. The experiment was conducted bt a one way completely randomize design. The treatment process was followed by observing the changes in the BOD and COD parameters. The results showed that the chicken dung inculum reduce COD content up to 73-76 per cent and BOD content up to 81-86 per cent. The cow dung inculum reduced COD and BOD contents up to 97-92 percent and up to 65-95 per cent respectively
BIOFLOKULASI MIKROORGANISME DAN PERANANNYA DALAM PENGOLAHAN AIR LIMBAH SECARA BIOLOGI
No full textBioflocculation is a direct result of the ability of the microorganims to agglomerate into large flocs with a high settling velocity, and is an important phenomenon often encountered in the biological treatment of wastewater. Bioflocculation is also very important in determining the dewatering characteristics of a sludge.The key 10 the successful operation of biological-oxidation units is the maintenance of adequate nutrients, microorganisms, and a favourable environment for the organisms to grow and utilize the organic matter. Although algae, bacteria, fungi and protozoa are introduced into the activated sludge, bacteria usually dominant as the primary feeders on the organic waste. The dominant bacteria of the sludge must satisfy two conditions: they must be able to utilize the organic waste and also be capable of readily forming flocs to facilitate separation from eflluent and thereby ensure their retention in the system. Therefore, it is essential to ensure that the proper environment is produced and effectively controlled to pave the dominant growth of flocforming bacteria in the system so that the settling characteristics of the sludge obtained are good.Flocculation of discrete microbial cells can either be biologically (bioflocoulation) or chemically induced (chemical flocculation). There seems to be general agreement that bioflocculation of microorganisms was observed to follow mechanism similar to those observed in the chemical flocculation of microorganisms. A review on the bioflocculation of microorganisms in relationship to aerobic wastewater treatment proces and to cultural and microbial growth conditions is presented. The bioflocculation mechanism is also discussed and summarized