Recent insights into polysaccharide-based hydrogels and their potential applications in food sector: a review
Fig. 3. Properties determining the quality of food packaging materials. Adapted from Ali and Ahmed [132] . Fig. 4
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Fig. 3. Properties determining the quality of food packaging materials.
Adapted from Ali and Ahmed [132] . Fig. 4. Schematic representation of thermosensitive mechanism of hydrogels. A. Manzoor et al. International Journal of Biological Macromolecules 213 (2022) 987–1006 997 glucomannan. The reaction is used in the medical field due to its anti- bacterial activity and providing long-lasting wound dressings that can offer better wound protection. This injectable hydrogel resulted in in- hibition rates of 98 % and 96 % respectively against E. coli and S. aureus respectively [146] . In the medical field, hydrogel-based bioadhesives such as composite hydrogels synthesized from gelatin methacryloyl (GelMA) and methacryloyl-substituted recombinant human tropoelastin (MeTro) using visible-light-induced for cross-linking with antimicrobial activity (both gram-positive and negative bacteria), have surpassed the structureless wound closure in wound healing [147] . Hydrogels syn- thesized from iota-carrageenan and gelatin used to incorporate drugs such as ciprofloxacin resulted in the widening of the zone of inhibition from 8.5 to 20.7 mm against nosocomial strains of Bacillus spp., Vibrio spp., Pseudomonas spp. and E. coli as compared to the marketed Ciplox ointment [148] . 3.3. Gas/water barrier properties Another important attribute to consider is the barrier (gas or water) property, which could be important in the case of hydrogels and hydrogel films ( Table 4 ). Furthermore, barrier properties of hydrogel films synthesized from different components like κ-carrageenan, agar, konjac glucomannan powder, and nanoclay (Cloisite® 30B) have been reported by Rhim and Wang [149] . The study showed that the ternary blend films have the water barrier properties determined by the techniques like water vapor permeability (WVP), water uptake ratio (WUR), water vapor uptake ratio (WVUR) that increased by the incor- poration of nanoclay in the synthesis. Moreover, Balasubramanian et al. [150] revealed the composition of components, shape of the hydrogel (transparent k-Carrageenan/Xanthan gum/Gellan gum), thermal, me- chanical, and water barrier properties based on water vapor perme- ability (WVP), water contact angle (WCA) and moisture content. This study reported the hydrogel film property of WVP ranged from 1.8–to 2.4 and moisture content 16.5–21.51. The gas/water barrier property of hydrogels makes them a potential antifogging material for the packing of agricultural products with a high respiration rate [149] . Oxygen is considered a harmful ingredient in foods during storage as it can lead to various deteriorative effects. To combat this deleterious component, Yang et al. [151] prepared hydrogel films from regenerated cellulose with profound and potential oxygen barrier properties. Protein- polysaccharide-based hydrogels with their composite structures, prep- aration mode, and applications in food packaging are given in Table 4 . Download 1.62 Mb. Do'stlaringiz bilan baham: |
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