The objective of the study is to elucidate the effect of reaction temperature and time during heterogeneous alkali reaction on degree of deacetylation (DD) of chitin. Two different analytical methods namely 1st derivative ultraviolet and Fourier transform infrared spectroscopies have been adopted to determine and compare the DD values of the prepared chitin derivates. Statistical analysis indicates that the most significant variable is the temperature followed by the time with slight interdependence between the two. By applying the developed statistical model, using temperature and time as the process variables. chitosan with 80% DD can be obtained in 9 h using 50% (v/v) NaOH and a reaction temperature of 100 degrees C. Thermal analysis both in air and nitrogen showed that thermodegradation occurs in two steps in the 200-600 degrees C range. The 1st derivative ultraviolet method has been advocated as a suitable method for the assessment of chitin derivates.

Statistical approach to the spectroscopic determination of the deacetylation degree of chitins and chitosans

CHIELLINI, FEDERICA;PIRAS, ANNA MARIA;CHIELLINI, EMO
2011-01-01

Abstract

The objective of the study is to elucidate the effect of reaction temperature and time during heterogeneous alkali reaction on degree of deacetylation (DD) of chitin. Two different analytical methods namely 1st derivative ultraviolet and Fourier transform infrared spectroscopies have been adopted to determine and compare the DD values of the prepared chitin derivates. Statistical analysis indicates that the most significant variable is the temperature followed by the time with slight interdependence between the two. By applying the developed statistical model, using temperature and time as the process variables. chitosan with 80% DD can be obtained in 9 h using 50% (v/v) NaOH and a reaction temperature of 100 degrees C. Thermal analysis both in air and nitrogen showed that thermodegradation occurs in two steps in the 200-600 degrees C range. The 1st derivative ultraviolet method has been advocated as a suitable method for the assessment of chitin derivates.
2011
Dash, M; Chiellini, Federica; Fernandez, E. G.; Piras, ANNA MARIA; Chiellini, Emo
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/144142
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 11
  • ???jsp.display-item.citation.isi??? 11
social impact