Determination of the degree of substitution of acetylated starch by hydrolysis, 1H NMR and TGA/IR

Matti Elomaa (Corresponding Author), Tomas Asplund, Pasi Soininen, Reino Laatikainen, Soili Peltonen, Sari Hyvärinen, Arto Urtti

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

The suitability of TGA/IR method for the analysis of the degree of substitution (DS) of acetylated starch (SA) was assessed. Ten standard samples were analysed for their DS by hydrolysis method and, those of the standards which could be properly dissolved, also by 1H NMR. NMR analysis shows as well that the standards had other structural differences than DS. By TGA using derivatives of thermograms (DTG) it was possible to predict the DS with percentual coefficient of determination of 98. Somewhat more accurate results (R2=98.7) were received when the evolving acetic acid was analysed by IR. The result is very good because it is at the same precision level as the results of the hydrolysis and 1H NMR methods.
Original languageEnglish
Pages (from-to)261 - 267
Number of pages7
JournalCarbohydrate Polymers
Volume57
Issue number3
DOIs
Publication statusPublished - 2004
MoE publication typeA1 Journal article-refereed

Fingerprint

Starch
Hydrolysis
Substitution reactions
Nuclear magnetic resonance
Acetic acid
Acetic Acid
Derivatives

Keywords

  • acetylated starch; degree of substitution; TGA/IR; NMR
  • biopolymers

Cite this

Elomaa, Matti ; Asplund, Tomas ; Soininen, Pasi ; Laatikainen, Reino ; Peltonen, Soili ; Hyvärinen, Sari ; Urtti, Arto. / Determination of the degree of substitution of acetylated starch by hydrolysis, 1H NMR and TGA/IR. In: Carbohydrate Polymers. 2004 ; Vol. 57, No. 3. pp. 261 - 267.
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Determination of the degree of substitution of acetylated starch by hydrolysis, 1H NMR and TGA/IR. / Elomaa, Matti (Corresponding Author); Asplund, Tomas; Soininen, Pasi; Laatikainen, Reino; Peltonen, Soili; Hyvärinen, Sari; Urtti, Arto.

In: Carbohydrate Polymers, Vol. 57, No. 3, 2004, p. 261 - 267.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Determination of the degree of substitution of acetylated starch by hydrolysis, 1H NMR and TGA/IR

AU - Elomaa, Matti

AU - Asplund, Tomas

AU - Soininen, Pasi

AU - Laatikainen, Reino

AU - Peltonen, Soili

AU - Hyvärinen, Sari

AU - Urtti, Arto

PY - 2004

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N2 - The suitability of TGA/IR method for the analysis of the degree of substitution (DS) of acetylated starch (SA) was assessed. Ten standard samples were analysed for their DS by hydrolysis method and, those of the standards which could be properly dissolved, also by 1H NMR. NMR analysis shows as well that the standards had other structural differences than DS. By TGA using derivatives of thermograms (DTG) it was possible to predict the DS with percentual coefficient of determination of 98. Somewhat more accurate results (R2=98.7) were received when the evolving acetic acid was analysed by IR. The result is very good because it is at the same precision level as the results of the hydrolysis and 1H NMR methods.

AB - The suitability of TGA/IR method for the analysis of the degree of substitution (DS) of acetylated starch (SA) was assessed. Ten standard samples were analysed for their DS by hydrolysis method and, those of the standards which could be properly dissolved, also by 1H NMR. NMR analysis shows as well that the standards had other structural differences than DS. By TGA using derivatives of thermograms (DTG) it was possible to predict the DS with percentual coefficient of determination of 98. Somewhat more accurate results (R2=98.7) were received when the evolving acetic acid was analysed by IR. The result is very good because it is at the same precision level as the results of the hydrolysis and 1H NMR methods.

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KW - biopolymers

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JO - Carbohydrate Polymers

JF - Carbohydrate Polymers

SN - 0144-8617

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