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
The synthesis method of L cysteic acid and its application in medicine,cosmetics and detergent have been discussed.It comes to the conclusion that synthesis of L cysteic acid by indirect electrooxidation is a notewort...The synthesis method of L cysteic acid and its application in medicine,cosmetics and detergent have been discussed.It comes to the conclusion that synthesis of L cysteic acid by indirect electrooxidation is a noteworthy and far reaching method. [WT5HZ]展开更多
The complex,C30H44N3O16DyS3,Dy2（H2O）4（Ts-β-AlaH）6·4H2O （Ts-β-AlaH=N-p-tolysulfonyl-β-Alanine）was synthesized and characterized by elemental analysis,IR,and X-ray diffraction study.The crydstal is monocli...The complex,C30H44N3O16DyS3,Dy2（H2O）4（Ts-β-AlaH）6·4H2O （Ts-β-AlaH=N-p-tolysulfonyl-β-Alanine）was synthesized and characterized by elemental analysis,IR,and X-ray diffraction study.The crydstal is monoclinic sydstem with P21/n space group.The cell parameters are:a=9.536（2）*!,b=18.981（3）*!,c=22.932（6）*!,β=100.15（2）°,Z=4,Mr=961,DC=2.082/cm3,V=2462.9（10）*!3.The structre of the complex can be viewed as a one-dimensional infinite chain.The Dysprosium ion is eight-coordinated with a geometry of distorted square antiprism.The antibacterial activity of the complex and N-p-tolysulfonyl-β-Alanine was tested.The results in dicated that the complexes were more bacteriostatically active than the ligand.展开更多
The term "trichothiodystrophy"(TTD) covers several autosomal recessive diseases whose diagnostic hallmark is short, brittle hair low in sulfur and cystine because of impaired synthesis of high-sulfur matrix ...The term "trichothiodystrophy"(TTD) covers several autosomal recessive diseases whose diagnostic hallmark is short, brittle hair low in sulfur and cystine because of impaired synthesis of high-sulfur matrix protein. Clinical symptoms associated with TTD represent a variable range of abnormalities in organs derived from ectoderm and neuroectoderm. Important laboratory tests of the hair for the diagnosis of TTD comprise polarizing microscopy ("tiger-tail"pattern), electron microscopy, and amino acids analysis of hydrolyzed hair with a special focus on cystine. However, only very few institutions determine the amino acid composition of human hair and nail clippings, which requires special sample preparation including hydrolysis. If no special precautions are taken, quantification of cysteine and cystine becomes inaccurate because of decomposition of these residues during hydrolysis. We therefore performed the sample work-up with azide-dependent oxidation which we have for the first time adapted for analysis of hair and nail clippings. With our control and parent data resembling published data on hair and nail samples, we obtained a decreased proportion of cysteine (half cystine, determined as cysteic acid) in materials obtained from a boy with TTD. Clearly, the method for the quantification of cysteine following sodium azide-dependent oxidation is a suitable and rather convenient approach to the quantification of cyst(e)ine and other amino acids in hair and nail proteins, and is a valuable contribution to the diagnosis of TTD.展开更多
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The synthesis method of L cysteic acid and its application in medicine,cosmetics and detergent have been discussed.It comes to the conclusion that synthesis of L cysteic acid by indirect electrooxidation is a noteworthy and far reaching method. [WT5HZ]
文摘The complex,C30H44N3O16DyS3,Dy2（H2O）4（Ts-β-AlaH）6·4H2O （Ts-β-AlaH=N-p-tolysulfonyl-β-Alanine）was synthesized and characterized by elemental analysis,IR,and X-ray diffraction study.The crydstal is monoclinic sydstem with P21/n space group.The cell parameters are:a=9.536（2）*!,b=18.981（3）*!,c=22.932（6）*!,β=100.15（2）°,Z=4,Mr=961,DC=2.082/cm3,V=2462.9（10）*!3.The structre of the complex can be viewed as a one-dimensional infinite chain.The Dysprosium ion is eight-coordinated with a geometry of distorted square antiprism.The antibacterial activity of the complex and N-p-tolysulfonyl-β-Alanine was tested.The results in dicated that the complexes were more bacteriostatically active than the ligand.
文摘The term "trichothiodystrophy"(TTD) covers several autosomal recessive diseases whose diagnostic hallmark is short, brittle hair low in sulfur and cystine because of impaired synthesis of high-sulfur matrix protein. Clinical symptoms associated with TTD represent a variable range of abnormalities in organs derived from ectoderm and neuroectoderm. Important laboratory tests of the hair for the diagnosis of TTD comprise polarizing microscopy ("tiger-tail"pattern), electron microscopy, and amino acids analysis of hydrolyzed hair with a special focus on cystine. However, only very few institutions determine the amino acid composition of human hair and nail clippings, which requires special sample preparation including hydrolysis. If no special precautions are taken, quantification of cysteine and cystine becomes inaccurate because of decomposition of these residues during hydrolysis. We therefore performed the sample work-up with azide-dependent oxidation which we have for the first time adapted for analysis of hair and nail clippings. With our control and parent data resembling published data on hair and nail samples, we obtained a decreased proportion of cysteine (half cystine, determined as cysteic acid) in materials obtained from a boy with TTD. Clearly, the method for the quantification of cysteine following sodium azide-dependent oxidation is a suitable and rather convenient approach to the quantification of cyst(e)ine and other amino acids in hair and nail proteins, and is a valuable contribution to the diagnosis of TTD.
