ZIB

Digitale Medien

Amino acid end-group in commercial heparin. II. Reaction kinetics of the amino end groups with 2,4,6-trinitrobenzenesulfonic acid (1986)

Arai, Kozo ; Nakamura, Yoshio ; Edwards, H. E. ; [weitere]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 24 (1986), S. 1497-1503

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ISSN: 0887-624X

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Three different commercial heparins were trinitophenylated with 2,4,6-trinitrobenzenesulfonic acid (TNBS) under aqueous conditions. The reaction kinetics of amino groups in heparin with TNBS showed that the reactivities of amino groups were significantly different for free amino groups on heparin, compared to reactivities in peptides and amino acid residues attached to heparin molecules. With TNBS, unreactive amino groups were always present during the reaction.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pola.1986.080240707

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Digitale Medien

Amino acid end-group in commercial heparin. I. Determination of the number of amino and hydroxyl end groups in heparin (1986)

Arai, Kozo ; Nakamura, Yoshio ; Edwards, H. E. ; [weitere]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 24 (1986), S. 911-923

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ISSN: 0887-624X

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Three commercial heparins of different molecular weights and anticoagulant activities were dinitrophenylated (DNP) with 2,4-dinitrofluorobenzene under aqueous conditions. The absorption spectra observed for DNP heparins in a 1% NaHCO3 solution consisted of the two absorption spectra characteristic of DNP - amino (N - DNP) and DNP - hydroxyl (O - DNP) groups. The number of N - DNP, O - DNP, and (N + O) - DNP groups were determined as well as the number of N - DNP groups per heparin chain; different values (i.e., 0.16, 0.17, and 0.55) for the latter were obtained with the three heparins. Further calculations showed that two of the heparins had approximately two (N + O) - DNP groups per chain (i.e., 2.1 and 1.8) whilst the third sample, considered to be a “cruder” heparin, had a value of 1.4.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pola.1986.080240509

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Digitale Medien

Pure rotational and vibration-rotational Raman spectra of 1H2, 1H2H and 2H2 (1986)

Edwards, H. G. M. ; Farwell, D. W. ; Gorvin, A. C. ; [weitere]

Chichester [u.a.] : Wiley-Blackwell

Journal of Raman Spectroscopy 17 (1986), S. 129-131

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ISSN: 0377-0486

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: The pure rotational (S-branch) and vibration-rotational (Q-branch) Raman spectra of 1H2, 1H2H and 2H2 have been recorded photographically and analysed with a precision greater than that achieved in earlier investigations to produce values of the bond lengths. From a combination of these results and those obtained from the species 2H3H, 1H3H and 3H2 a mean value of the bond length in the equilibrium configuration of re = 74.151±0.001 pm has been obtained.

Zusätzliches Material: 2 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jrs.1250170126

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Digitale Medien

The pure rotation Raman spectrum of 17O18O (1986)

Edwards, H. G. M. ; Long, D. A. ; Najm, K. A. B.

Chichester [u.a.] : Wiley-Blackwell

Journal of Raman Spectroscopy 17 (1986), S. 431-432

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ISSN: 0377-0486

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: The pure rotation Raman spectrum of 17O18O has been recorded photographically using laser excitation and a spectrograph with a reciprocal linear dispersion of 1.4 cm-1 mm-1 at 488.0 nm. The following B0, D0 and r0 values were obtained; B0=1.31546±0.00002 cm-1, 106D0=3.50±0.05 cm-1 and r0=121.072±0.002 pm.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jrs.1250170509

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Digitale Medien

Line widths in the pure rotational Raman spectra of nitrogen, oxygen and hydrogen broadened by foreign gases (1988)

Edwards, H. G. M. ; Long, D. A. ; Webb, S. W.

Chichester [u.a.] : Wiley-Blackwell

Journal of Raman Spectroscopy 19 (1988), S. 457-461

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ISSN: 0377-0486

Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Broadening coefficients, σp, have been determined for the pure rotational Raman lines of nitrogen and oxygen, perturbed by hydrogen, helium and methane, and of hydrogen broadened by helium, argon, nitrogen and carbon monoxide, over the pressure range 2-100 bar with a host gas partial pressure of 1 bar. The results are summarized below:The broadening coefficients are discussed in relation to the dipole, quadrupole and octopole moments and the polarizabilities of the perturbing species.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jrs.1250190705

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