Reaksi epoksidasi mengubah ikatan rangkap pada senyawa olefin menjadi epoksida atau oksiran. Metil ester dari minyak nabati dengan kandungan asam lemak tak jenuh dapat digunakan sebagai bahan baku reaksi epoksidasi. Epoksida berbasis memiliki potensi yang besar untuk plasticizer pemrosesan polimer. Pada penelitian ini, dilakukan secara in-situ menggunakan asetat, hidrogen peroksida, dan sulfat ...

Biodiesel can be produced both in homogeneous and heterogeneous ways. Heterogeneous synthesis allows to easily separate catalyst from esters. In this work, eggshells as a were used for triglyceride transesterification with 1-butanol. Response surface methodology was process optimization. It obtained that are suitable processes. A longer duration higher amount have high influence on ester yield....

introduction: ectopic molar pregnancy is a rare occurrence and consequently not often considered as a diagnostic possibility. in this article, an attempt was made to stress on the need for histopathological examination and follow up of every case of ectopic pregnancy. this was substantiated with the help of a case report. case presentation: a 30-year-old gravida 4, para 3, pregnant woman with a...

stomata are closed by moisture stress, reducing carbon assimilation and yield production with dry land agriculture. relative 13c to 12c molar ratio assimilation by a plant is a function of time stomata remain open during plant life time, itself a function of moisture stress. the purpose of this study was to test the existence of any relationship between stomatal conductance and assimilation rat...

Anaerobic growth of Klebsiella aerogenes NCDO 711 (NCTC 418) on citrate was dependent on the presence of Na+ in the medium, and fermentation of citrate was mediated via the fermentation pathway enzymes, citrate lyase and a Na+-dependent oxalacetate decarboxylase. This confirms the previous findings on strain NCTC 418. Growth under aerobic conditions was independent of Na+. The mean generation t...

A solvent-free semihydrogenation of 2-methyl-3-butyn-2-ol (MBY) to 2-methyl-3-buten-2-ol was performed in a capillary reactor (10 m long, 0.53 mm i.d.) coated with a titania supported Pd-Bi catalyst. Several coatings with different Pd/Bi ratio have been prepared. The catalysts have been characterized with SEM, TEM, EDX, XRD analysis and N2 adsorption-desorption measurements. The maximum alkene ...

The unsaturated fatty acid maleinization reaction was adopted according to the well documented procedures of synthesizing the alkenyl succinic anhydrides (ASA) that are often used in industry (i.e. for paper sizing agents and cutting fluids lubricants) . For monounsaturated fatty acid such as oleic acid, 13 times of maleic anhydride to oleic acid molar ratio are recommended to obtain high yield...

In this study, the extraction of water-soluble polysaccharides from the seed coat of black soybean (BSCP) was investigated and optimized. A response surface methodology based on a Box-Behnken design (BBD) was used to optimize the extraction conditions as follows: extraction temperature, 100°C; ratio of water to material, 22.3 mL/g; and extraction time, 133.2 min. Under these conditions, the exp...

Escherichia coli strains HL2765 and HL27659k harboring pRU600 and pKK313 were examined for succinate production under aerobic conditions using galactose, sucrose, raffinose, stachyose, and mixtures of these sugars extracted from soybean meal and soy solubles. HL2765(pKK313)(pRU600) and HL27659k(pKK313)(pRU600) consumed 87mM and 98mM hexose of soybean meal extract and produced 83mM and 95mM succ...