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Published 2022

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Publication details

Journal : Molecules , vol. 27 , 2022

Publisher : MDPI

International Standard Numbers :
Printed : 1420-3049
Electronic : 1420-3049

Publication type : Academic article

Contributors : Sharmin, Nusrat; Rosnes, Jan Thomas; Prabhu, Leena Amit; Böcker, Ulrike; Sivertsvik, Morten

Issue : 16

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Kjetil Aune
Chief Librarian
kjetil.aune@nofima.no

Summary

In this study, acetic acid (AA-2% w/v), a combination of acetic acid and citric acid
(AA-1% w/v + CA-1% w/w), and three different concentrations of citric acid (CA-2, 4 and 6%
w/w) were used to create chitosan solution. The FTIR analysis showed the presence of residual CA
in all the CA-containing samples where no trace of AA was observed. The tensile strengths of the
CA-containing samples were lower than the AA samples. Whereas the values for the elongation at
break of the CA samples were higher than the AA samples, which kept increasing with an increasing
CA content due to the plasticizing effect from residual citric acid. The elongation at break values for
4 and 6% CA-containing samples were 98% higher than the AA samples. The samples prepared with
CA showed shorter LVE regions that reduced with an increasing CA concentration compared to the
AA samples. Different acid concentrations did not have a large effect on the gelation time. However,
CA-containing samples showed higher viscosities as compared to the AA-containing solution, which
increased with an increasing CA content. The water vapour transmission rates of the CA-containing
samples were lower than the others. All the chitosan solutions suppressed the growth of the two test
strains, and none of the variants reached an abs 600 nm at 0.2.

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