Contributions to the analytical chemistry of vitamin B"1"2. The thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide in the solid state
The thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide has been examined using for the first time thermogravimetric (TG), derivative thermogravimetric (DTG), and differential thermal (DTA) analyses carried out simultaneously with a derivatograph. While water is removed from cyanoco...
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E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
1982 |
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| Reproduktion: |
Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 |
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| Übergeordnetes Werk: |
in: Thermochimica Acta - Amsterdam : Elsevier, 59(1982), 2, Seite 211-220 |
| Übergeordnetes Werk: |
volume:59 ; year:1982 ; number:2 ; pages:211-220 |
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| 520 | |a The thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide has been examined using for the first time thermogravimetric (TG), derivative thermogravimetric (DTG), and differential thermal (DTA) analyses carried out simultaneously with a derivatograph. While water is removed from cyanocobalamin and hydroxocobalamin up to 140^oC, and up to 120^oC for cobinamide, the cyanide ligand is thermally removed from cyanocobalamin at 140-145^oC, and at about 120^oC in the case of cobinamide. The IR spectra were used to monitor the extent of cyanocobalamin degradation.Mathematical analysis of the TG curve, using the derived equation of Freeman and Carroll, to evaluate the kinetic parameters of the reaction showed that the removal of water from cyanocobalamin (20-140^o) is a zero-order reaction with an activation energy of 26.7 +/- 1.9 kcal mole^-^1, both determined using a computer-programmed least squares regression analysis. These findings are useful for the estimation of the shelf-life of a vitamin B"1"2 preparation. | ||
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(DE-627)NLEJ174619472 (DE-599)GBVNLZ174619472 DE-627 ger DE-627 rakwb eng Contributions to the analytical chemistry of vitamin B"1"2. The thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide in the solid state 1982 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide has been examined using for the first time thermogravimetric (TG), derivative thermogravimetric (DTG), and differential thermal (DTA) analyses carried out simultaneously with a derivatograph. While water is removed from cyanocobalamin and hydroxocobalamin up to 140^oC, and up to 120^oC for cobinamide, the cyanide ligand is thermally removed from cyanocobalamin at 140-145^oC, and at about 120^oC in the case of cobinamide. The IR spectra were used to monitor the extent of cyanocobalamin degradation.Mathematical analysis of the TG curve, using the derived equation of Freeman and Carroll, to evaluate the kinetic parameters of the reaction showed that the removal of water from cyanocobalamin (20-140^o) is a zero-order reaction with an activation energy of 26.7 +/- 1.9 kcal mole^-^1, both determined using a computer-programmed least squares regression analysis. These findings are useful for the estimation of the shelf-life of a vitamin B"1"2 preparation. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Goldstein, S. oth Duca, A. oth in Thermochimica Acta Amsterdam : Elsevier 59(1982), 2, Seite 211-220 (DE-627)NLEJ174595298 (DE-600)1500974-9 0040-6031 nnns volume:59 year:1982 number:2 pages:211-220 http://linkinghub.elsevier.com/retrieve/pii/0040-6031(82)87129-3 GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 59 1982 2 211-220 |
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(DE-627)NLEJ174619472 (DE-599)GBVNLZ174619472 DE-627 ger DE-627 rakwb eng Contributions to the analytical chemistry of vitamin B"1"2. The thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide in the solid state 1982 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide has been examined using for the first time thermogravimetric (TG), derivative thermogravimetric (DTG), and differential thermal (DTA) analyses carried out simultaneously with a derivatograph. While water is removed from cyanocobalamin and hydroxocobalamin up to 140^oC, and up to 120^oC for cobinamide, the cyanide ligand is thermally removed from cyanocobalamin at 140-145^oC, and at about 120^oC in the case of cobinamide. The IR spectra were used to monitor the extent of cyanocobalamin degradation.Mathematical analysis of the TG curve, using the derived equation of Freeman and Carroll, to evaluate the kinetic parameters of the reaction showed that the removal of water from cyanocobalamin (20-140^o) is a zero-order reaction with an activation energy of 26.7 +/- 1.9 kcal mole^-^1, both determined using a computer-programmed least squares regression analysis. These findings are useful for the estimation of the shelf-life of a vitamin B"1"2 preparation. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Goldstein, S. oth Duca, A. oth in Thermochimica Acta Amsterdam : Elsevier 59(1982), 2, Seite 211-220 (DE-627)NLEJ174595298 (DE-600)1500974-9 0040-6031 nnns volume:59 year:1982 number:2 pages:211-220 http://linkinghub.elsevier.com/retrieve/pii/0040-6031(82)87129-3 GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 59 1982 2 211-220 |
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(DE-627)NLEJ174619472 (DE-599)GBVNLZ174619472 DE-627 ger DE-627 rakwb eng Contributions to the analytical chemistry of vitamin B"1"2. The thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide in the solid state 1982 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide has been examined using for the first time thermogravimetric (TG), derivative thermogravimetric (DTG), and differential thermal (DTA) analyses carried out simultaneously with a derivatograph. While water is removed from cyanocobalamin and hydroxocobalamin up to 140^oC, and up to 120^oC for cobinamide, the cyanide ligand is thermally removed from cyanocobalamin at 140-145^oC, and at about 120^oC in the case of cobinamide. The IR spectra were used to monitor the extent of cyanocobalamin degradation.Mathematical analysis of the TG curve, using the derived equation of Freeman and Carroll, to evaluate the kinetic parameters of the reaction showed that the removal of water from cyanocobalamin (20-140^o) is a zero-order reaction with an activation energy of 26.7 +/- 1.9 kcal mole^-^1, both determined using a computer-programmed least squares regression analysis. These findings are useful for the estimation of the shelf-life of a vitamin B"1"2 preparation. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Goldstein, S. oth Duca, A. oth in Thermochimica Acta Amsterdam : Elsevier 59(1982), 2, Seite 211-220 (DE-627)NLEJ174595298 (DE-600)1500974-9 0040-6031 nnns volume:59 year:1982 number:2 pages:211-220 http://linkinghub.elsevier.com/retrieve/pii/0040-6031(82)87129-3 GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 59 1982 2 211-220 |
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(DE-627)NLEJ174619472 (DE-599)GBVNLZ174619472 DE-627 ger DE-627 rakwb eng Contributions to the analytical chemistry of vitamin B"1"2. The thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide in the solid state 1982 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide has been examined using for the first time thermogravimetric (TG), derivative thermogravimetric (DTG), and differential thermal (DTA) analyses carried out simultaneously with a derivatograph. While water is removed from cyanocobalamin and hydroxocobalamin up to 140^oC, and up to 120^oC for cobinamide, the cyanide ligand is thermally removed from cyanocobalamin at 140-145^oC, and at about 120^oC in the case of cobinamide. The IR spectra were used to monitor the extent of cyanocobalamin degradation.Mathematical analysis of the TG curve, using the derived equation of Freeman and Carroll, to evaluate the kinetic parameters of the reaction showed that the removal of water from cyanocobalamin (20-140^o) is a zero-order reaction with an activation energy of 26.7 +/- 1.9 kcal mole^-^1, both determined using a computer-programmed least squares regression analysis. These findings are useful for the estimation of the shelf-life of a vitamin B"1"2 preparation. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Goldstein, S. oth Duca, A. oth in Thermochimica Acta Amsterdam : Elsevier 59(1982), 2, Seite 211-220 (DE-627)NLEJ174595298 (DE-600)1500974-9 0040-6031 nnns volume:59 year:1982 number:2 pages:211-220 http://linkinghub.elsevier.com/retrieve/pii/0040-6031(82)87129-3 GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 59 1982 2 211-220 |
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(DE-627)NLEJ174619472 (DE-599)GBVNLZ174619472 DE-627 ger DE-627 rakwb eng Contributions to the analytical chemistry of vitamin B"1"2. The thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide in the solid state 1982 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide has been examined using for the first time thermogravimetric (TG), derivative thermogravimetric (DTG), and differential thermal (DTA) analyses carried out simultaneously with a derivatograph. While water is removed from cyanocobalamin and hydroxocobalamin up to 140^oC, and up to 120^oC for cobinamide, the cyanide ligand is thermally removed from cyanocobalamin at 140-145^oC, and at about 120^oC in the case of cobinamide. The IR spectra were used to monitor the extent of cyanocobalamin degradation.Mathematical analysis of the TG curve, using the derived equation of Freeman and Carroll, to evaluate the kinetic parameters of the reaction showed that the removal of water from cyanocobalamin (20-140^o) is a zero-order reaction with an activation energy of 26.7 +/- 1.9 kcal mole^-^1, both determined using a computer-programmed least squares regression analysis. These findings are useful for the estimation of the shelf-life of a vitamin B"1"2 preparation. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Goldstein, S. oth Duca, A. oth in Thermochimica Acta Amsterdam : Elsevier 59(1982), 2, Seite 211-220 (DE-627)NLEJ174595298 (DE-600)1500974-9 0040-6031 nnns volume:59 year:1982 number:2 pages:211-220 http://linkinghub.elsevier.com/retrieve/pii/0040-6031(82)87129-3 GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 59 1982 2 211-220 |
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contributions to the analytical chemistry of vitamin b"1"2. the thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide in the solid state |
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Contributions to the analytical chemistry of vitamin B"1"2. The thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide in the solid state |
| abstract |
The thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide has been examined using for the first time thermogravimetric (TG), derivative thermogravimetric (DTG), and differential thermal (DTA) analyses carried out simultaneously with a derivatograph. While water is removed from cyanocobalamin and hydroxocobalamin up to 140^oC, and up to 120^oC for cobinamide, the cyanide ligand is thermally removed from cyanocobalamin at 140-145^oC, and at about 120^oC in the case of cobinamide. The IR spectra were used to monitor the extent of cyanocobalamin degradation.Mathematical analysis of the TG curve, using the derived equation of Freeman and Carroll, to evaluate the kinetic parameters of the reaction showed that the removal of water from cyanocobalamin (20-140^o) is a zero-order reaction with an activation energy of 26.7 +/- 1.9 kcal mole^-^1, both determined using a computer-programmed least squares regression analysis. These findings are useful for the estimation of the shelf-life of a vitamin B"1"2 preparation. |
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The thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide has been examined using for the first time thermogravimetric (TG), derivative thermogravimetric (DTG), and differential thermal (DTA) analyses carried out simultaneously with a derivatograph. While water is removed from cyanocobalamin and hydroxocobalamin up to 140^oC, and up to 120^oC for cobinamide, the cyanide ligand is thermally removed from cyanocobalamin at 140-145^oC, and at about 120^oC in the case of cobinamide. The IR spectra were used to monitor the extent of cyanocobalamin degradation.Mathematical analysis of the TG curve, using the derived equation of Freeman and Carroll, to evaluate the kinetic parameters of the reaction showed that the removal of water from cyanocobalamin (20-140^o) is a zero-order reaction with an activation energy of 26.7 +/- 1.9 kcal mole^-^1, both determined using a computer-programmed least squares regression analysis. These findings are useful for the estimation of the shelf-life of a vitamin B"1"2 preparation. |
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The thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide has been examined using for the first time thermogravimetric (TG), derivative thermogravimetric (DTG), and differential thermal (DTA) analyses carried out simultaneously with a derivatograph. While water is removed from cyanocobalamin and hydroxocobalamin up to 140^oC, and up to 120^oC for cobinamide, the cyanide ligand is thermally removed from cyanocobalamin at 140-145^oC, and at about 120^oC in the case of cobinamide. The IR spectra were used to monitor the extent of cyanocobalamin degradation.Mathematical analysis of the TG curve, using the derived equation of Freeman and Carroll, to evaluate the kinetic parameters of the reaction showed that the removal of water from cyanocobalamin (20-140^o) is a zero-order reaction with an activation energy of 26.7 +/- 1.9 kcal mole^-^1, both determined using a computer-programmed least squares regression analysis. These findings are useful for the estimation of the shelf-life of a vitamin B"1"2 preparation. |
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<?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim"><record><leader>01000caa a22002652 4500</leader><controlfield tag="001">NLEJ174619472</controlfield><controlfield tag="003">DE-627</controlfield><controlfield tag="005">20210705215755.0</controlfield><controlfield tag="007">cr uuu---uuuuu</controlfield><controlfield tag="008">070505s1982 xx |||||o 00| ||eng c</controlfield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-627)NLEJ174619472</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-599)GBVNLZ174619472</subfield></datafield><datafield tag="040" ind1=" " ind2=" "><subfield code="a">DE-627</subfield><subfield code="b">ger</subfield><subfield code="c">DE-627</subfield><subfield code="e">rakwb</subfield></datafield><datafield tag="041" ind1=" " ind2=" "><subfield code="a">eng</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Contributions to the analytical chemistry of vitamin B"1"2. The thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide in the solid state</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">1982</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">zzz</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">z</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">zu</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">The thermal stability of cyanocobalamin, hydroxocobalamin and cobinamide has been examined using for the first time thermogravimetric (TG), derivative thermogravimetric (DTG), and differential thermal (DTA) analyses carried out simultaneously with a derivatograph. While water is removed from cyanocobalamin and hydroxocobalamin up to 140^oC, and up to 120^oC for cobinamide, the cyanide ligand is thermally removed from cyanocobalamin at 140-145^oC, and at about 120^oC in the case of cobinamide. The IR spectra were used to monitor the extent of cyanocobalamin degradation.Mathematical analysis of the TG curve, using the derived equation of Freeman and Carroll, to evaluate the kinetic parameters of the reaction showed that the removal of water from cyanocobalamin (20-140^o) is a zero-order reaction with an activation energy of 26.7 +/- 1.9 kcal mole^-^1, both determined using a computer-programmed least squares regression analysis. These findings are useful for the estimation of the shelf-life of a vitamin B"1"2 preparation.</subfield></datafield><datafield tag="533" ind1=" " ind2=" "><subfield code="f">Elsevier Journal Backfiles on ScienceDirect 1907 - 2002</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Goldstein, S.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Duca, A.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">in</subfield><subfield code="t">Thermochimica Acta</subfield><subfield code="d">Amsterdam : Elsevier</subfield><subfield code="g">59(1982), 2, Seite 211-220</subfield><subfield code="w">(DE-627)NLEJ174595298</subfield><subfield code="w">(DE-600)1500974-9</subfield><subfield code="x">0040-6031</subfield><subfield code="7">nnns</subfield></datafield><datafield tag="773" ind1="1" ind2="8"><subfield code="g">volume:59</subfield><subfield code="g">year:1982</subfield><subfield code="g">number:2</subfield><subfield code="g">pages:211-220</subfield></datafield><datafield tag="856" ind1="4" ind2="0"><subfield code="u">http://linkinghub.elsevier.com/retrieve/pii/0040-6031(82)87129-3</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_USEFLAG_H</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">ZDB-1-SDJ</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_NL_ARTICLE</subfield></datafield><datafield tag="951" ind1=" " ind2=" "><subfield code="a">AR</subfield></datafield><datafield tag="952" ind1=" " ind2=" "><subfield code="d">59</subfield><subfield code="j">1982</subfield><subfield code="e">2</subfield><subfield code="h">211-220</subfield></datafield></record></collection>
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