- Tytuł:
- Influence of uv-irradiation on molecular weight of chitosan
- Autorzy:
-
Sionkowska, A.
Płanecka, A.
Lewandowska, K.
Kaczmarek, B.
Szarszewska, P. - Powiązania:
- https://bibliotekanauki.pl/articles/1035332.pdf
- Data publikacji:
- 2013
- Wydawca:
- Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
- Tematy:
-
UV-irradiation
chitosan
photodegradatio
photooxidation - Opis:
- In the present paper the results regarding the influence of UV-irradiation with 254 nm wavelength on the molecular weight of chitosan are presented. The concentration of chitosan solution was 0.5%(w/w) in 0.1 M acetic acid. The degree of deacetylation, determined by potentiometric titration in an acidic solution by alkaline, was 81%. Viscosity-average molecular weight of chitosan was determined using an Ubbelohde capillary viscometer. Mark–Houwink equation for the calculation of molecular weight was applied. The results showed that the viscosityaverage molecular weight of chitosan was decreasing with increasing time of exposure to UV-irradiation. Spectroscopic analysis of UV-Vis and FTIR confirmed the photodegradation processes of chitosan. The increasing absorbance in UV-Vis spectra indicated the formation of new chromophoric groups after UV-irradiation of chitosan. Microscopic studies showed changes on the surface of the irradiated films of chitosan and decrease of the surface roughness.
- Źródło:
-
Progress on Chemistry and Application of Chitin and its Derivatives; 2013, 18, 18; 21-28
1896-5644 - Pojawia się w:
- Progress on Chemistry and Application of Chitin and its Derivatives
- Dostawca treści:
- Biblioteka Nauki
Artykuł