Fluorescent starch/chitosan composites as safe and photoprotective coverings for perishable food products

IF 6.3 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability Pub Date : 2025-03-08 DOI:10.1016/j.polymdegradstab.2025.111317

Dagmara Bajer

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引用次数: 0

Abstract

Perishable product quality and shelf life (e.g., fresh fruit and vegetables) may be partially controlled process by employing intelligent packaging. Protecting food from light, which quickly initiates food spoilage, prompting its chemical, enzymatic, and physical modification, plays a crucial role in packaging functions. In the present research, environmentally safe starch-chitosan films enriched with dialdehyde starch and fluorescent dyes (fluorescein/Rose Bengal) exhibiting UV radiation absorption properties were designed. Such networks formed of biopolymers and fluorescein/Rose Bengal may limit direct ¹O₂ attacks. The starch changes its crystallinity degree (X_c) from 17.4 % in starch film, to 19.6 % for starch-chitosan (SCh) film and 26,4 % for starch-chitosan-dialdehyde starch (SChDS) mixture. When modified with dyes its maximal drop was 13.9 % (Starch/chitosan/dialdehyde starch/Rose Bengal film; RSChDS), and the increase to 24 % for starch/chitosan/dialdehyde starch/fluorescein film (FSChDS) was observed. Mixtures with fluorescein were more resistant to bending than those with Rose Bengal. SEM images demonstrate good structural integrity of the samples (with the exception of starch/chitosan/ Rose Bengal film, RSCh). Spectroscopic studies (UV–Vis, FTIR-ATR, Raman, XRD, NMR) confirmed the interaction between blend components (covalent, ionic, and hydrogen bonding). Competitive oxidation reactions, chromophore formation, dye photolysis, and conformational changes of starch were observed after prolonged UV-light irradiation. The type of dye and irradiation insignificantly modify the thermal resistance of the samples. UV-light influenced increased surface roughness of the FS and FSChDS samples, and the opposite effect (smoothing the surface) for RS and RSChDS blends. Dialdehyde starch (DS) promoted cross-linking between the mixture components. It improved the flexibility of the films (most in the case of samples with fluorescein) but also limited the susceptibility to UV radiation. Coatings of starch/chitosan/dialdehyde starch/fluorescein (FSChDS) appear to be good blockers for sunlight, protecting food products against accelerated spoilage. Such coatings may be applied to the broadly understood packaging industry for light-sensitive and perishable food, cosmetics, and medicine products, such as lipids and vitamins, to protect against UV radiation and the influence of microorganisms.

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来源期刊

Polymer Degradation and Stability 化学-高分子科学

CiteScore

10.10

自引率

10.20%

发文量

325

审稿时长

23 days

期刊介绍： Polymer Degradation and Stability deals with the degradation reactions and their control which are a major preoccupation of practitioners of the many and diverse aspects of modern polymer technology. Deteriorative reactions occur during processing, when polymers are subjected to heat, oxygen and mechanical stress, and during the useful life of the materials when oxygen and sunlight are the most important degradative agencies. In more specialised applications, degradation may be induced by high energy radiation, ozone, atmospheric pollutants, mechanical stress, biological action, hydrolysis and many other influences. The mechanisms of these reactions and stabilisation processes must be understood if the technology and application of polymers are to continue to advance. The reporting of investigations of this kind is therefore a major function of this journal. However there are also new developments in polymer technology in which degradation processes find positive applications. For example, photodegradable plastics are now available, the recycling of polymeric products will become increasingly important, degradation and combustion studies are involved in the definition of the fire hazards which are associated with polymeric materials and the microelectronics industry is vitally dependent upon polymer degradation in the manufacture of its circuitry. Polymer properties may also be improved by processes like curing and grafting, the chemistry of which can be closely related to that which causes physical deterioration in other circumstances.