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Effect of Citric Acid Cross Linking on the Mechanical, Rheological and Barrier Properties of Chitosan. | LitMetric

Effect of Citric Acid Cross Linking on the Mechanical, Rheological and Barrier Properties of Chitosan.

Molecules

Department of Processing Technology, Nofima AS, Richard Johnsens gate 4, 4021 Stavanger, Norway.

Published: August 2022

AI Article Synopsis

  • The study compared the effects of acetic acid and different concentrations of citric acid on chitosan solutions, analyzing their structural and mechanical properties.
  • FTIR analysis indicated that citric acid residues were present in samples with citric acid, while no acetic acid was detected; also, citric acid-containing samples had higher elongation at break but lower tensile strength compared to acetic acid samples.
  • Additionally, the citric acid samples showed higher viscosities and lower water vapor transmission rates, while all chitosan solutions effectively inhibited the growth of two test strains without any reaching a specific absorbance threshold.

Article Abstract

In this study, acetic acid (AA-2% /), a combination of acetic acid and citric acid (AA-1% / + CA-1% /), and three different concentrations of citric acid (CA-2, 4 and 6% /) 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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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9415850PMC
http://dx.doi.org/10.3390/molecules27165118DOI Listing

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