New insights into the mechanism of photodegradation of chitosan

Bussière, Pierre‐Olivier; Gardette, Jean‐Luc; Rapp, Géraldine; Masson, Claire; Thérias, Sandrine

doi:10.1016/j.carbpol.2021.117715

Cited by 18 publications

(22 citation statements)

References 46 publications

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“…On the other hand, we have found essential changes in the CTS+TA and CTS+CA films surface after 2 h irradiation, such as appearance of new pores. We assume it may be caused by the photodegradation process and such a phenomenon has previously been observed [ 30 ]. Our results may be associated with the phenolic acids chemical structures in which especially tannic acid bears much more OH groups sensitive to photodegradation [ 31 ].…”

Section: Discussionmentioning

confidence: 99%

The Physicochemical and Antibacterial Properties of Chitosan-Based Materials Modified with Phenolic Acids Irradiated by UVC Light

Kaczmarek-Szczepańska

Wekwejt

Mazur

et al. 2021

IJMS

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This paper concerns the physicochemical properties of chitosan/phenolic acid thin films irradiated by ultraviolet radiation with wavelengths between 200 and 290 nm (UVC) light. We investigated the preparation and characterization of thin films based on chitosan (CTS) with tannic (TA), caffeic (CA) and ferulic acid (FA) addition as potential food-packaging materials. Such materials were then exposed to the UVC light (254 nm) for 1 and 2 h to perform the sterilization process. Different properties of thin films before and after irradiation were determined by various methods such as Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), atomic force microscopy (AFM), differential scanning calorimeter (DSC), mechanical properties and by the surface free energy determination. Moreover, the antimicrobial activity of the films and their potential to reduce the risk of contamination was assessed. The results showed that the phenolic acid improving properties of chitosan-based films, short UVC radiation may be used as sterilization method for those films, and also that the addition of ferulic acid obtains effective antimicrobial activity, which have great benefit for food packing applications.

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Section: Discussionmentioning

confidence: 99%

The Physicochemical and Antibacterial Properties of Chitosan-Based Materials Modified with Phenolic Acids Irradiated by UVC Light

Kaczmarek-Szczepańska

Wekwejt

Mazur

et al. 2021

IJMS

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“…As shown in previous works on chitosan exposed to UV radiation, the changes in the absorption spectra are caused by decomposition reactions, mainly chain scission resulting in cleavage of glycosidic bonds, dehydroxylation, dehydroxymethylation, and pyranose ring-opening with simultaneous photooxidation, leading to the formation of new carbonyl moieties [ 52 , 53 ]. The mechanism of the photo-oxidative degradation of CS is via free radicals, which was confirmed by the electron spin resonance (ESR) method [ 52 ].…”

Section: Resultsmentioning

confidence: 98%

“…In the latest work on the effect of UV radiation (λ > 300 nm) on chitosan, the photodegradation mechanism was re-analyzed and summarized based on new experimental results [ 53 ]. The formation of volatile products such as amide and acetamide was detected by solid phase micro extraction and gas chromatography with mass spectrometry (SPME-GC/MS).…”

Section: Resultsmentioning

confidence: 99%

Fluorescent Chitosan Modified with Heterocyclic Aromatic Dyes

et al. 2021

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Chitosan is a valuable, functional, and biodegradable polysaccharide that can be modified to expand its applications. This work aimed to obtain chitosan derivatives with fluorescent properties. Three heterocyclic aromatic dyes (based on benzimidazole, benzoxazole, and benzothiazole) were synthesized and used for the chemical modification of chitosan. Emission spectroscopy revealed the strong fluorescent properties of the obtained chitosan derivatives even at a low N-substitution degree of the dye. The effect of high-energy ultraviolet radiation (UV–C) on modified chitosan samples was studied in solution with UV–Vis spectroscopy and in the solid state with FTIR spectroscopy. Moreover, cytotoxicity towards three different cell types was evaluated to estimate the possibilities of biomedical applications of such fluorescent chitosan-based materials. It was found that the three new derivatives of chitosan were characterized by good resistance to UV–C, which suggests the possibility of using these materials in medicine and various industrial sectors.

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“…Also according to literature, in Table 2, main FTIR bands of Ch are listed. [36][37][38] Therefore, in Figure 2a, three main ranges, specifically, range A (ca. 1500-1800 cm À1 ), range B (ca.…”

Section: Resultsmentioning

confidence: 99%

Effect of different processing techniques and presence of antioxidant on the chitosan film performance

Infurna

Cavallaro

Milioto

et al. 2022

Vinyl Additive Technology

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In the last two decades, the naturally occurring polysaccharides have gained great attention because of their potential applications in different sectors, for example, from food to biomedical sectors. Chitosan is a cationic polysaccharide with good transparency, and currently, it has been considered also as suitable material for the formulation film and coating in cultural heritage protection. In this work, the chitosan films (Ch), with and without natural antioxidant such as citric acid (CA), are formulated considering two different processing techniques: (i) conventional solvent casting and (ii) compression molding, that is an unconventional method for this polysaccharide, giving the possibility to formulate films with extended surface and constant thickness. The effects of processing conditions and antioxidant presence on the properties and performance are evaluated by thermo‐gravimetric analysis, FTIR and UV–visible spectroscopy, water contact angle measurements and tensile test. Besides, the durability of all investigated Ch and Ch/CA has been evaluated subjecting thin film to UVB exposure and monitoring their structural changes by FTIR analysis in time. All obtained results suggest that the chitosan films can be processed successfully by both solvent casting and compression molding techniques. Further, the CA presence in Ch films has a beneficial effect on the thermal resistance and durability and no negative effect on the transparency and optical properties.

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New insights into the mechanism of photodegradation of chitosan

Cited by 18 publications

References 46 publications

The Physicochemical and Antibacterial Properties of Chitosan-Based Materials Modified with Phenolic Acids Irradiated by UVC Light

The Physicochemical and Antibacterial Properties of Chitosan-Based Materials Modified with Phenolic Acids Irradiated by UVC Light

Fluorescent Chitosan Modified with Heterocyclic Aromatic Dyes

Effect of different processing techniques and presence of antioxidant on the chitosan film performance

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