For the determination of vitamin B 6 derivatives, a high performance liquid chromatography(HPLC) system composed of a single reversed-phase octadecylsilane column and fluorescence detector with an isocratic elution wa...For the determination of vitamin B 6 derivatives, a high performance liquid chromatography(HPLC) system composed of a single reversed-phase octadecylsilane column and fluorescence detector with an isocratic elution was proposed. This HPLC system perfectly analyzed pyridoxine, pyridoxal, pyridoxamine, pyridoxine 5′-phosphate and pyridoxamine 5′-phosphate together with pyridoxic acid in biological samples. In this method, relatively low fluorescence intensity of pyridoxal 5′-phasphate was improved by converting it to pyridoxic 5′-phosphate with KCN. The analytical procedure is very simple and economical, it is a useful tool for studying vitamin B 6 in animal body.展开更多
A lipid_depleted cytochrome b 6f (Cyt b 6f) preparation was obtained from spinach (Spinacia oleracea L.) chloroplasts. Upon reconstitution of this preparation with the membrane lipids purified from spinach thylakoid...A lipid_depleted cytochrome b 6f (Cyt b 6f) preparation was obtained from spinach (Spinacia oleracea L.) chloroplasts. Upon reconstitution of this preparation with the membrane lipids purified from spinach thylakoid, the effects of different membrane lipids on the electron transfer activity were studied. The results show that the electron transfer activity of Cyt b 6f is obviously stimulated to different extents, respectively, by monogalactosyldiacylglycerol (MGDG), digalactosyldiacylglycerol (DGDG), phosphatidylcholine (PC), phosphatidylglycerol (PG) and sulfoquinovosyldiacylglycerol (SQDG), and that the extents of stimulation may be closely related to the charge of the membrane lipids. The stimulation of non_charged lipids (MGDG, DGDG) and neutrally_charged lipid (PC) was high with a maximum enhancement of 89%, 75% and 77%, respectively; but the stimulation of two kinds of negatively_charged lipid (PG and SQDG) was relatively low with a maximum enhancement of 43% and 26%, respectively.展开更多
文摘For the determination of vitamin B 6 derivatives, a high performance liquid chromatography(HPLC) system composed of a single reversed-phase octadecylsilane column and fluorescence detector with an isocratic elution was proposed. This HPLC system perfectly analyzed pyridoxine, pyridoxal, pyridoxamine, pyridoxine 5′-phosphate and pyridoxamine 5′-phosphate together with pyridoxic acid in biological samples. In this method, relatively low fluorescence intensity of pyridoxal 5′-phasphate was improved by converting it to pyridoxic 5′-phosphate with KCN. The analytical procedure is very simple and economical, it is a useful tool for studying vitamin B 6 in animal body.
基金The State Key Basic Research and Development Plan(G1998010100)Innovative Foundation of Laboratory of Photosynthesis Basic Research Insitute of Botany,The Chinese Academy of Sciences
文摘A lipid_depleted cytochrome b 6f (Cyt b 6f) preparation was obtained from spinach (Spinacia oleracea L.) chloroplasts. Upon reconstitution of this preparation with the membrane lipids purified from spinach thylakoid, the effects of different membrane lipids on the electron transfer activity were studied. The results show that the electron transfer activity of Cyt b 6f is obviously stimulated to different extents, respectively, by monogalactosyldiacylglycerol (MGDG), digalactosyldiacylglycerol (DGDG), phosphatidylcholine (PC), phosphatidylglycerol (PG) and sulfoquinovosyldiacylglycerol (SQDG), and that the extents of stimulation may be closely related to the charge of the membrane lipids. The stimulation of non_charged lipids (MGDG, DGDG) and neutrally_charged lipid (PC) was high with a maximum enhancement of 89%, 75% and 77%, respectively; but the stimulation of two kinds of negatively_charged lipid (PG and SQDG) was relatively low with a maximum enhancement of 43% and 26%, respectively.