Effects of lactic acid and mixed acid aqueous solutions on the preparation, structure and properties of thermoplastic chitosan

Dou, Xiaoya; Li, Qian; Wu, Qiangxian; Duan, Liansheng; Zhou, Shi–Liang

doi:10.1016/j.eurpolymj.2020.109850

Cited by 8 publications

(4 citation statements)

References 26 publications

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“…For the laccase/LG-treated chitosan (Lac/LG-CTS), it showed the typical phenolic characteristic peaks at 3357.63 and 1374.18 cm –1 , corresponding to the O–H bending vibration in plane, which was from the phenolic and alkyl hydroxyl groups, respectively. The bands between 3300 and 3500 cm –1 were attributed to the stretching vibration of N–H in the amino group . The decreased intensities of LG/CTS and Lac/LG-CTS at 3463.99 and 3475.96 cm –1 , respectively, were ascribed to the decreased amino groups of chitosan.…”

Section: Resultsmentioning

confidence: 96%

“…The bands between 3300 and 3500 cm −1 were attributed to the stretching vibration of N−H in the amino group. 39 The decreased intensities of LG/CTS and Lac/LG-CTS at 3463.99 and 3475.96 cm −1 , respectively, were ascribed to the decreased amino groups of chitosan. For the Lac/LG-CTS, the decreased absorptions at 1653.11 and 1423.49 cm −1 on the glucosamine unit were attributed to the bending vibrations of N−H and NH 3 + , respectively.…”

Section: Resultsmentioning

confidence: 99%

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Laccase-Catalyzed Grafting of Lauryl Gallate on Chitosan To Improve Its Antioxidant and Hydrophobic Properties

Liu

Gao³

et al. 2021

Biomacromolecules

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Biografting is a promising and ecofriendly approach to meet various application requirements of products. Herein, a popular green enzyme, laccase, was adopted to graft a hydrophobic phenolic compound (lauryl gallate, LG) onto chitosan (CTS). The resultant chitosan derivate (Lac/LG-CTS) was systematically analyzed by Fourier transform infrared (FTIR), grafting efficiency, scanning probe microscopy (SPM), and X-ray diffraction (XRD). This grafting technique produced a multifunctional chitosan copolymer with remarkably enhanced antioxidant property, hydrophobicity, and moisture barrier property. Furthermore, the swelling capacity and acid solubility of the copolymer film decreased significantly, although the tensile strength and elongation were slightly weakened as compared to those of native chitosan. These results suggest that the Lac/LG-CTS holds great potential as a food-packaging material, preservative agent, or edible coating material.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Laccase-Catalyzed Grafting of Lauryl Gallate on Chitosan To Improve Its Antioxidant and Hydrophobic Properties

Liu

Gao³

et al. 2021

Biomacromolecules

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“…Temperature might not be well regulated during the preparation of biopolymers. For example, the protocol of chitosan preparation includes heating an acidic chitosan solution at about 70 °C, [20,23] however, temperatures higher than 70 °C will also succeed in dissolving chitosan chains, [24] and relatively vigorous temperatures may also be used to treat chitosan materials. [25] We aimed to examine the possible negative effect of elevated temperatures on the stability of genipin and, thus, on its crosslinking efficiency.…”

Section: Resultsmentioning

confidence: 99%

Study of Genipin Behavior in Neutral and Acidic Aqueous Solutions at Elevated Temperatures

2023

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Genipin is known to polymerize under basic conditions, and the obtained genipin oligomers might have an impact on the chemical and physical properties of the crosslinked materials. In this study, we intend to mimic the experimental condition in which genipin is used as a chemical crosslinker. We focus on the degradation of genipin at neutral and slightly acidic conditions using NMR. We report genipin polymerization at neutral and acidic conditions. Unlike dialdehyde crosslinkers, genipin requires heating to promote its crosslinking activity. We found that elevated temperatures enhance the degradation of genipin and promote its polymerization.

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“…Therefore, the compact structure of Chit films are found in hydroxylated acid films such as lactic acid, citric acid, and malic acid. This behavior is explained by the intermolecular interactions between Chit molecules and hydroxylated acid counter anions [ 37 , 45 , 46 , 47 ]. The aforementioned interactions affect the structure and mechanical properties of Chit films, resulting in the films formed in different conditions possessing different surface morphologies.…”

Section: Resultsmentioning

confidence: 99%

Rheological and Film-Forming Properties of Chitosan Composites

Lewandowska

Szulc

2022

IJMS

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Chitosan (Chit) and its composite films are widely used in biomedical, cosmetic, and packaging applications. In addition, their properties can be improved and modified using various techniques. In this study, the effect of the type of clay in Chit composites on the structure, morphology, and physical properties of Chit solution and films was tested. The liquid flow properties of Chit solution with and without clay were carried out using the steady shear test. Chit films containing clay were obtained using the solution-casting method. The morphology, structure, and physical properties of the films were characterized by scanning electron microscopy, atomic force microscopy, infrared spectroscopy, swelling behavior, and tensile tests. The results reveal that for the Chit solution with clay (C1) containing 35 wt.% dimethyl dialkyl (C14–C18) amine, the apparent viscosity is the highest, whereas Chit solutions with other clays show reduced apparent viscosity. Rheological parameters of Chit composites were determined by the power law and Cross models, indicating shear-thinning behavior. Analytical data were compared, and show that the addition of clay is favorable to the formation of intermolecular interactions between Chit and clay, which improves in the properties of the studied composites.

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Effects of lactic acid and mixed acid aqueous solutions on the preparation, structure and properties of thermoplastic chitosan

Cited by 8 publications

References 26 publications

Laccase-Catalyzed Grafting of Lauryl Gallate on Chitosan To Improve Its Antioxidant and Hydrophobic Properties

Laccase-Catalyzed Grafting of Lauryl Gallate on Chitosan To Improve Its Antioxidant and Hydrophobic Properties

Study of Genipin Behavior in Neutral and Acidic Aqueous Solutions at Elevated Temperatures

Rheological and Film-Forming Properties of Chitosan Composites

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