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The ir absorption spectra of com. preparations of D-penicillamine [52-67-5] suggested the occurrence of 2 different crystal forms.The form corresponding to that of the United States Food and Drug Administration authentic specimen, polymorph II, had an absorption peak at 1092 cm-1 that was more intense than the adjacent peaks at ∼1050 and 1160 cm-1.In contrast, the other form, polymorph I, had a min. between peaks at 1078 and 1101 cm-1, that were less intense than the adjacent peaks at ∼1050 and 1160 cm-1.Both polymorphs were seen as anisotropic crystals under the polarizing microscope, I as needles and II as plates.X-ray powder diffraction anal. confirmed that forms I and II were different crystalline phases.

1991-08-01·Biochemical Society Transactions2区 · 生物学

Limited proteolysis as a probe for protein folding

2区 · 生物学

Article

作者: COOKSON, E. JANE ; BEYNON, ROBERT J. ; RAMZAN, M. ARSHAD

The proteolysis of native bovine somatotropin (I) by thermolysin was examined by 2nd derivative absorption spectroscopy.Results were satisfactory.This method was used to monitor the proteolysis of I in the presence and absence of 6M urea.Results indicated that in the absence of reducing agent, I retains considerable structure even in 6M urea.

1984-01-01·The Analyst3区 · 化学

Specific enzymatic procedure for the determination of starch in soya-based animal feed pre-mixes

3区 · 化学

Article

作者: Hui, M. S.

Starch [9005-25-8] in soybean-based animal feed premixes was determined by enzymic hydrolysis followed by TLC.The method is superior to that of an EEC directive (1972) and the AOAC procedure, which show too much interference from nonstarch polysaccharides.

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