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Hadi Munarko Azis Boing Sitanggang Feri Kusnandar Slamet Budijanto 《International Journal of Food Science & Technology》2021,56(9):4540-4548
Germination of brown rice can be completed by full soaking and partial soaking methods. This study aimed to analyse the influence of germination methods on the bioactive accumulations in germinated brown rice (GBR). Germination was conducted in four treatments: (i) membrane reactor with full (RFS) and (ii) partial soaking method soaking (RAG), (iii) manual soaking for complete germination (MFS) and (iv) partial manual soaking in combination with atmospheric germination (MAG). The results showed that soaking BR in membrane reactor accelerated the shoots' growth and increased GABA (γ-aminobutyric acid) content compared with the manual soaking method. The RAG treatment achieved higher GABA content (up to 125 mg/100 g), total phenolic and flavonoid content, and antioxidant activity than other germination methods. The main finding of this research indicates that membrane reactor effectively enhances the growth of sprouts. The combination of partial soaking in membrane reactor and atmospheric germination (RAG) is a suited method to increase GABA accumulation in GBR. 相似文献
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Ratnawati Jarnuzi Gunlazuardi Eniya Listiani Dewi Slamet 《International Journal of Hydrogen Energy》2014
Addition of NaBF4 during anodic synthesis of TiO2 nanotube arrays (TNTAs) photocatalyst and its application for generating hydrogen from glycerol–water solution has been investigated. The TNTAs were synthesized by anodic oxidation of titanium metal in glycerol electrolyte solution containing NH4F. During the process, the NaBF4 with different concentrations were added to the solution. Annealing of the formatted TNTAs were performed at 500 °C for 3 h under 20% H2 in argon atmosphere, to produce crystalline phase photocatalyst. FESEM analysis showed that self-organized and well ordered TNTAs have range of inner diameters, wall thicknesses and lengths approximately 62–130 nm, 27 nm and 1.53 μm, respectively. FTIR analysis indicated that carbon, nitrogen and boron were incorporated into the TNTAs lattice. Refer to UV–Vis DRS and XRD analysis, the TNTAs photocatalysts prepared have the band gap range of 2.70–3.10 eV, with mostly have anatase phase. The NaBF4 addition during synthesis, resulted modified TNTAs that can reduce the recombination of photo-induced electrons-holes. Photocatalytic hydrogen production test, from glycerol–water solution, indicated that TNTAs with the addition of NaBF4 during anodic synthesis process showed higher hydrogen production comparing to the one without NaBF4 addition. Among them the TNTAs,b (with the addition 5 mM of NaBF4) showed up to 32% improvement in the hydrogen production and can be considered as the optimum condition. 相似文献
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Slamet Sudarmadji Pericles Markakis 《Journal of the science of food and agriculture》1977,28(4):381-383
Soybeans were fermented into tempeh by Rhizopus oligosporus NRRL 2710. The phytic acid content of soybeans was reduced by about one-third as a result of this fermentation, while an equivalent amount of phosphate was released in the tempeh. The reduction of phytic acid was due to phytase elaborated by the mould of the fermentation. The pH optimum of this enzyme was 5.6 and the Km of the phytase-phytate reaction was 0.28 × 10?3 M. 相似文献
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Harsono Hadi Shinobu Tokuda Slamet Rahardjo 《Solar Energy Materials & Solar Cells》2003,75(3-4):673-678
Performance of the photovoltaic system is highly influenced by the weather, especially the irradiation and the temperature. To simplify the design of solar generator power, a mathematical model and its validity of the solar cell are required. In this work, the value of the parameters in the mathematical model is obtained by the measurement of the I–V curve of the module. To get an I–V curve, one of the modules in the system was radiated and loaded by a load simulator. A photovoltaic pumping system with maximum power point tracker was built and tested. The results were analyzed and evaluated by using the parameters and the photovoltaic system was shown to be well optimized. 相似文献
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Photocatalytic hydrogen production from glycerol–water mixture over Pt‐N‐TiO2 nanotube photocatalyst
The effects of several modifications on TiO2 P25 in producing hydrogen from glycerol–water mixture have been investigated. Prior to further modification, TiO2 underwent hydrothermal treatment at 130°C for several hours to obtain nanotube shape. TiO2 nanotubes (TiNT) was then doped with platinum (Pt) and nitrogen (N) by employing photo‐deposition and impregnation method, respectively. SEM and XRD results showed that Pt‐N‐TiNT was successfully obtained as pure anatase crystal structure. The effects of glycerol content to photocatalytic activity of hydrogen production have also been studied, result in 50%v of glycerol as the optimum concentration correspond to the stoichiometric volume ratio of glycerol reforming. The results of photo‐production test showed that TiNT (nanotube) could enhance hydrogen generation by two times compared with unmodified P25 (nanoparticle). Meanwhile, simultaneous modification of TiNT by Pt and N dopants (Pt‐N‐TiNT) lead to activity improvement up to 13 times compared with P25. The output of this study may contribute toward finding an alternative pathway to produce H2 from renewable resources. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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J Pater L Slamet B Zee D Osoba D Warr J Rusthoven 《Canadian Metallurgical Quarterly》1994,2(3):161-166
In this in vitro study the retentive strength of enamel, either conventionally etched with a phosphoric acid gel or conditioned with an oxalic acid containing etching agent, was investigated. Five experimental restorative resins with filler contents between 0 and 78% by weight were polymerized on the etched enamel surfaces. In spite of the pronounced micromorphological differences of the patterns generated with the two etching agents, the bond strengths mediated were very similar. Application of an intermediate low-viscous or adhesive resin had no influence on bond strength. Exponential relationships were found between the filler content of the resins on the one hand and their flexural moduli and flexural strengths on the other. Significant exponential relations were also demonstrated between filler content and bond strength to the etched enamel surface. The linear relationship between mechanical properties of the resins and their bond strengths to etched enamel indicates that debonding occurred by cohesive failure in resin. 相似文献