N-glycinylmaleamic acid(GMA) was synthesized by using maleic anhydride and glycine.Five synthesis methods for N-glycinylmaleimide(GMI)were compared.Among them the method using triethylamine to dehydrate was found to b...N-glycinylmaleamic acid(GMA) was synthesized by using maleic anhydride and glycine.Five synthesis methods for N-glycinylmaleimide(GMI)were compared.Among them the method using triethylamine to dehydrate was found to be the best.Their structures were confirmed by fourier transform infrared spectroscopy(FTIR) and nuclear magnetic resonance spectrum(HNMR).展开更多
L cysteic acid was synthesized from L cystine by indirect electroxidation method in this paper.High yield and purity of the product were obtained.The product structure was characterized by IR and 1HNMR, and its TGA cu...L cysteic acid was synthesized from L cystine by indirect electroxidation method in this paper.High yield and purity of the product were obtained.The product structure was characterized by IR and 1HNMR, and its TGA curve was discussed as well.展开更多
Tryptophan(Trp) residues in inulinase were modified by chemical reagent N-bromossuccinimide(NBS).The results of Spande′s method indicate that there were seventeen Trp residues in inulinase and five of them were locat...Tryptophan(Trp) residues in inulinase were modified by chemical reagent N-bromossuccinimide(NBS).The results of Spande′s method indicate that there were seventeen Trp residues in inulinase and five of them were located on the surface of the enzyme.Three of these Trp residues were none-essential residues which showed the fastest rate by Zhou′s plot.Two relative faster reacting residues were both essential for the activity of the enzyme.The other twelve were the slowest or none-reactive residues for the reaction.The study on fluorescence quenching of inulinase shows that KI could not quench all of the fluorescence from Trp residues in inulinase which indicate that there are two kinds of Trp residues in inulinase acrylamide(Acr),a polarized quencher without electronic charge could quench almost all of the fluorescence from Trp residues in inuoinase while there are still seventy percernt of the activity of the enzyme left.The collisional quenching constants(K_D) of inulinase at different concentrations of Acr were calculated in terms of Stern-Volmer equation.展开更多
文摘N-glycinylmaleamic acid(GMA) was synthesized by using maleic anhydride and glycine.Five synthesis methods for N-glycinylmaleimide(GMI)were compared.Among them the method using triethylamine to dehydrate was found to be the best.Their structures were confirmed by fourier transform infrared spectroscopy(FTIR) and nuclear magnetic resonance spectrum(HNMR).
文摘L cysteic acid was synthesized from L cystine by indirect electroxidation method in this paper.High yield and purity of the product were obtained.The product structure was characterized by IR and 1HNMR, and its TGA curve was discussed as well.
文摘Tryptophan(Trp) residues in inulinase were modified by chemical reagent N-bromossuccinimide(NBS).The results of Spande′s method indicate that there were seventeen Trp residues in inulinase and five of them were located on the surface of the enzyme.Three of these Trp residues were none-essential residues which showed the fastest rate by Zhou′s plot.Two relative faster reacting residues were both essential for the activity of the enzyme.The other twelve were the slowest or none-reactive residues for the reaction.The study on fluorescence quenching of inulinase shows that KI could not quench all of the fluorescence from Trp residues in inulinase which indicate that there are two kinds of Trp residues in inulinase acrylamide(Acr),a polarized quencher without electronic charge could quench almost all of the fluorescence from Trp residues in inuoinase while there are still seventy percernt of the activity of the enzyme left.The collisional quenching constants(K_D) of inulinase at different concentrations of Acr were calculated in terms of Stern-Volmer equation.
