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Maryam Beigomi,Mohammad Amin Mohammadifar,Maryam Hashemi,Mohsen Ghods rohani,Kalaiselvi Senthil,Mohharam Valizadeh 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.6
A protease from Withania coagulans fruits wasevaluated for milk-clotting properties. The optimumtemperature and pH for enzyme activity were 70oC and 4,respectively. The protease also exhibited an excellentthermal stability at 60oC for 30 min. Fractional precipitationusing ammonium sulfate showed that the 40-50% fraction(F5) possessed the highest milk-clotting activity. The F5fraction showed a Mw band of 66 kDa by SDS-PAGE. Gelformation was monitored using low amplitude oscillatoryrheology at different temperatures. An Arrhenius plot wasused to describe the temperature dependence of thegelation rate parameter. Time sweep testing showed that anincrease in temperature was accompanied by a decrease inthe gelation onset time, a higher gel formation rate, andhigher values for final gel strength. W.coagulans fruitshave potential for use as a rennet substitute.
Fazaeli, Razieh,Aliyan, Hamid,Mohammadifar, Foroogh,Zamani, Amir Abbas,Bagi, Mohammad Javad Korean Chemical Society 2011 대한화학회지 Vol.55 No.4
Vanadium 치환체인 polyoxometalate 1, [Cu(2,2'-bipy)]$[Cu(2,2'-bipy)_2]_2[PMo_8V_6O_{42}]{\cdot}1.5H_2O$을 가지고 있는 inorganicorganic complex의 촉매 활성도를 Biginelli 반응에 적용하여 연구하였다. Dihydropyrimidinones를 one-pot 합성하는 반응에서, $H_3PMo_{12}O_{40}$ 촉매 보다[Cu(2,2'-bipy)]$[Cu(2,2'-bipy)_2]_2[PMo_8V_6O_{42}]{\cdot}1.5H_2O$ 촉매가 더 좋은 결과를 나타내었다. The catalytic activity of an inorganic-organic complex with a vanadium-substituted polyoxometalate 1, formulated as [Cu(2,2'-bipy)]$[Cu(2,2'-bipy)_2]_2[PMo_8V_6O_{42}]{\cdot}1.5H_2O$ was studied in the Biginelli reactions. The obtained results showed that, in the one-pot synthesis of dihydropyrimidinones, the turnover frequencies (TOF) for the [Cu(2,2'-bipy)]$[Cu(2,2'-bipy)_2]_2[PMo_8V_6O_{42}]{\cdot}1.5H_2O$ catalyst were higher than the $H_3PMo_{12}O_{40}$ catalyst.