Perspectives on Utilization of Edible Coatings and Nano-laminate Coatings for Extension of Postharvest Storage of Fruits and Vegetables

Flores-López, María L.; Cerqueira, Miguel A.; Rodríguez, Diana Jasso de

doi:10.1007/s12393-015-9135-x

Cited by 160 publications

(101 citation statements)

References 112 publications

(104 reference statements)

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“…Concerning the effectiveness as wood protecting agents of the composites, it was lower than that of the chitosan-only treatments (especially in comparison with MMWC), in contrast with the results from the in vitro assays. This unexpected result may be explained by their low viscosity and poor adhesion properties [63], which may be enhanced by adding thickening agents to chitosan oligomers, such as natural gums, starches, pectins, alginate and carrageenan [64]; by preparing CO-clay based composite materials [65]; or by using other impregnation procedures (involving vacuum and pressure).…”

Section: Weight Lossmentioning

confidence: 99%

Chitosan-Based Coatings to Prevent the Decay of Populus spp. Wood Caused by Trametes Versicolor

et al. 2018

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Chitosan and chitosan oligomers are receiving increasing attention due to their antimicrobial properties. In the present study, they were assayed as a preventive treatment against white-rot decay of Populus wood (very important in economic and environmental terms), caused by Trametes versicolor fungus. Their capacity to incorporate different chemical species into the polymer structure with a view to improving their anti-fungal activity was also assessed by mixing oligo-chitosan with propolis and silver nanoparticles. The minimum inhibitory concentration of medium-molecular weight chitosan (MMWC), chitosan oligomers (CO), propolis (P), nanosilver (nAg), and their binary and ternary composites against T. versicolor was determined in vitro. Although all products exhibited anti-fungal properties, composites showed an enhanced effect as compared to the individual products: 100% mycelial growth inhibition was attained for concentrations of 2.0 and 0.2 mg·mL −1 for the CO-P binary mixture, respectively; and 2 µg·mL −1 for nAg in the ternary mixture. Subsequently, MMWC, CO, CO-P and CO-P-nAg composites were tested on poplar wood blocks as surface protectors. Wood decay caused by the fungus was monitored by microscopy and vibrational spectroscopy, evidencing the limitations of the CO-based coatings in comparison with MMWC, which has a higher viscosity and better adhesion properties. The usage of MMWC holds promise for poplar wood protection, with potential industrial applications. Coatings 2018, 8, 415 2 of 15its main characteristics, such as its bioactivity, non-toxicity or biodegradability, its antimicrobial effect is especially relevant [4][5][6]. Its activity against different fungi, gram positive and gram negative bacteria, is ascribed to the positive charge of amino group (NH 3 + ), which interacts electrostatically with the surface of the cellular membrane, destabilizing it. As a consequence, the presence of chitosan inside the cell can lead to intracellular responses such as inactivation or blocking of enzymes activities, and of DNA transcription and translation [7,8].The antifungal activity of chitosan not only depends on the fungus species, but also on its molecular weight (MW), polymerization degree (PD) or deacetylation degree (DD). For instance, chito-oligosaccharides with low MW, PD and DD have been reported to be more effective on phytopathogenic fungi than chitosan with higher MW, PD or DD [9][10][11].Another known advantage from chitosan and its oligomers is associated with their sorption and chelating properties. The cationic nature of the polymer allows it to bind to different chemicals species, ranging from organic macromolecules to metal nanoparticles [12][13][14]. Natural oils or extracts of natural products can be incorporated into the chitosan matrix, for example, by cross-linking, producing solutions, films or beads [15][16][17]. In the particular case of propolis, its polyphenols have been reported to form hydrogen bonds and covalent bonds with the functional groups in chitosan [18]. This results...

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Section: Weight Lossmentioning

confidence: 99%

Chitosan-Based Coatings to Prevent the Decay of Populus spp. Wood Caused by Trametes Versicolor

et al. 2018

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“…In order to improve the efficiency and stability of edible coatings/films it is essential to find adequate materials. Coatings/ films can be produced using a wide variety of products, such as polysaccharides, proteins, lipids or resins, alone or, more often, in combination (Flores-López et al, 2015). Chitosan (1,4-linked 2amino-2-deoxy-b-D-glucan) is one of the most widely used natural compounds in the edible coating production.…”

Section: Introductionmentioning

confidence: 99%

Effect of chitosan– Aloe vera coating on postharvest quality of blueberry ( Vaccinium corymbosum ) fruit

Vieira

Flores-López

Rodríguez

et al. 2016

Postharvest Biology and Technology

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263

138

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A B S T R A C TThe present study was carried out to evaluate the effect of chitosan-based edible coatings with Aloe vera extract on the postharvest blueberry fruit quality during storage at 5 C. Firstly, A. vera fractions (pulp and liquid) were extracted from leaves and evaluated in terms of antifungal and antioxidant capacities. The choice of the most adequate chitosan and A. vera fraction concentrations to be incorporated in coating formulation was made based on the wettability of the corresponding coating solutions. Coatings with 0.5% (w/v) chitosan + 0.5% (w/v) glycerol + 0.1% (w/v) Tween 80 + 0.5% (v/v) A. vera liquid fraction presented the best characteristics to uniformly coat blueberry surface. Physico-chemical (i.e., titratable acidity, pH, weight loss) and microbiological analyses of coated blueberries (non-inoculated or artificially inoculated with Botrytis cinerea) were performed during 25 d. Microbiological growth and water loss levels were approximately reduced by 50% and 42%, respectively, in coated blueberries after 25 d compared to uncoated blueberries. After 15 d, weight loss values were 6.2% and 3.7% for uncoated and chitosan-A. vera coated blueberries, respectively. Uncoated fruits presented mold contamination after 2 d of storage (2.0 AE 0.32 log CFU g À1 ), whilst fruits with chitosan-based coatings with A. vera presented mold contamination only after 9 d of storage (1.3 AE 0.35 log CFU g À1 ). Overall, coatings developed in this study extend blueberries' shelf-life for about 5 d, demonstrating for the first time that the combination of chitosan and A. vera liquid fraction as edible coating materials has great potential in expanding the shelflife of fruits.

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“…It is important to find suitable materials in order to improve the efficiency and stability of packaging films produced from natural sources. Packaging films may be produced using different types of compounds, such as polysaccharides, proteins and lipids, alone or combined in blends or layers (Flores-López, Cerqueira, Jasso de Rodríguez, & Vicente, 2015). Chitosan (1,4-linked 2-amino-2-deoxy-β-D-glucan) is one of the most widely used natural compounds due to its characteristics such as high antimicrobial activity, biocompatibility, biodegradability and non-toxic profile.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of a chitosan film with grape seed extract-carvacrol microcapsules and its effect on the shelf-life of refrigerated Salmon (Salmo salar)

Alves

Rico

Cruz

et al. 2018

LWT

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120

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A B S T R A C TChitosan films with grape seed extract and carvacrol microcapsules (CMF) were prepared and their physicochemical properties and effect on physico-chemical and microbiological parameters in refrigerated salmon were tested. CMF showed higher values of thickness (0.41 ± 0.04 mm), moisture content (13 ± 1 g water/100 g film), a (11 ± 3), b (12 ± 3), opacity (20 ± 1%), water vapor permeability (WVP) (4.4 ± 0.4) × 10 −10 gPa −1 s −1 m −1 , oxygen permeability (O 2 P) (1.3 ± 0.3) × 10 −12 gPa −1 s −1 m −1 and carbon dioxide permeability (CO 2 P) (1.3 ± 0.3) × 10 −12 gPa −1 s −1 m −1 as compared to those of the chitosan control film (CCF). CMF showed lower values of L (66 ± 5) and water solubility (17 ± 1%).The salmon packed into CMF presented on the 7th day of storage a lower value of TVB-N (37 ± 4 mg N/ 100 g fish) as compared to the CCF (42 ± 3 mg N/100 g fish) and control samples (CS; 66 ± 7 mg N/100 g fish). The CMF showed lower values of pH and lightness after 7 days of storage as compared to CS and CCF. The CMF showed also lower values of mesophilic and psychrophilic bacteria and Pseudomonas spp, reaching the maximum limit allowed for the first two only on the 7th day of storage.CMF increases the shelf-life of refrigerated salmon to 4-7 days of storage due to the antimicrobial effect of the natural agents.

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Perspectives on Utilization of Edible Coatings and Nano-laminate Coatings for Extension of Postharvest Storage of Fruits and Vegetables

Cited by 160 publications

References 112 publications

Chitosan-Based Coatings to Prevent the Decay of Populus spp. Wood Caused by Trametes Versicolor

Chitosan-Based Coatings to Prevent the Decay of Populus spp. Wood Caused by Trametes Versicolor

Effect of chitosan– Aloe vera coating on postharvest quality of blueberry ( Vaccinium corymbosum ) fruit

Preparation and characterization of a chitosan film with grape seed extract-carvacrol microcapsules and its effect on the shelf-life of refrigerated Salmon (Salmo salar)

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