Effects of chitosan treatment on avocado postharvest diseases and expression of phenylalanine ammonia-lyase, chitinase and lipoxygenase genes

Obianom, Chinelo; Romanazzi, Gianfranco; Sivakumar, Dharini

doi:10.1016/j.postharvbio.2018.10.004

Cited by 80 publications

(49 citation statements)

References 27 publications

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“…Generally, in the food industry neat chitosan has appeared increasingly studied due to its antimicrobial properties, especially as a coating on fruit. Obianom et al demonstrated that 1.5 wt.% solution of chitosan could reduce the incidence of stem-end rot and anthracnose in inoculated and naturally infected avocados, hence significantly influenced the postharvest decay control of avocado [207]. Silva at al.…”

Section: Chitosanmentioning

confidence: 99%

Prospect of Polysaccharide-Based Materials as Advanced Food Packaging

Nešić

Cabrera‐Barjas

Dimitrijević-Branković

et al. 2019

Molecules

228

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The use of polysaccharide-based materials presents an eco-friendly technological solution, by reducing dependence on fossil resources while reducing a product's carbon footprint, when compared to conventional plastic packaging materials. This review discusses the potential of polysaccharides as a raw material to produce multifunctional materials for food packaging applications. The covered areas include the recent innovations and properties of the polysaccharide-based materials. Emphasis is given to hemicelluloses, marine polysaccharides, and bacterial exopolysaccharides and their potential application in the latest trends of food packaging materials, including edible coatings, intelligent films, and thermo-insulated aerogel packaging.

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Section: Chitosanmentioning

confidence: 99%

Prospect of Polysaccharide-Based Materials as Advanced Food Packaging

Nešić

Cabrera‐Barjas

Dimitrijević-Branković

et al. 2019

Molecules

228

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“…Phenylalanine also is part of the glycolytic and liposynthetic pathways. [40,41]. It has been reported that phenylalanine de ciency can severely affect protein metabolism in the breast and compromise the health of the organ.…”

Section: Discussionmentioning

confidence: 99%

Matrine-chitosan hydrogels for treating subclinical bovine mastitis by intramammary infusion—effect on milk microbiome and metabolites

Wu¹,

Zhang²,

Niu³

et al. 2020

Preprint

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BackgroundThe metabolic processes of cows undergo significant changes during subclinical mastitis, but their molecular mechanisms have not been clearly elucidated. This study investigated the changes in milk metabolites after intramammary infusion of matrine, a plant alkaloid with anticancer properties, in the form of a chitosan hydrogel into bovine mammary glands with subclinical mastitis. Infusions were continued for seven days, and milk samples were collected on day 1 and day 7 for analysis of the microbiome by 16S rRNA gene sequencing and metabolites by liquid chromatography-mass spectrometry.ResultsMatrine-chitosan hydrogels (MCHs) significantly decreased the somatic cell count on day 7 and the Simpson index indicated that microbial diversity was significantly lower on day 7 than on day 1. On day 7, the numbers of Aerococcus, Corynebacterium_1 and Staphylococcus were significantly lower, while the abundance of Firmicutes was very significantly decreased. The numbers of Probacteria increased, however. In milk samples, we identified 74 differentially expressed metabolites and the MCH infusion group had the most significantly upregulated metabolites including sphingolipids, glycerophospholipids, flavonoids and fatty acyls. Principal component analysis and the orthogonal partial least squares discriminant test confirmed good separation of the milk metabolites. The identification of active milk metabolic pathways after MCH treatment supported the known antimicrobial and anti-inflammatory properties of matrine that are associated with glycerophospholipid metabolism and the sphingolipid metabolic signaling pathways.ConciusionsThese insights into the mechanisms and the corresponding biological responses to matrine demonstrate its potential immunoregulatory activity and emphasize the need for continued investigation.

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“…Chitosan activates differential expressions of genes and metabolic changes that ensue as an effect of precise recognition of progression between the host and pathogen [61]. The gene expression for treated fruit can be comparably different to uncoated infected [64,65]. Studies indicate that chitosan application triggers persin biosynthesis, and this in turn protects of avocado fruits against C. gloeosporioides [65].…”

Section: Chitosanmentioning

confidence: 99%

“…Studies indicate that chitosan application triggers persin biosynthesis, and this in turn protects of avocado fruits against C. gloeosporioides [65]. Chitosan at 1.5% considerably reduced the incidence of stem-end rot and anthracnose in both inoculated and naturally infected avocados [64]. The chitosan coating induced the defence-related genes through the up-regulation of PAL and down-regulation of LOX genes, which moderately allowed higher epicatechin contents in the exocarp, which could have contributed to improved anthracnose control [66].…”

Section: Chitosanmentioning

confidence: 99%

“…Latent tissue that typically begins to activate when tissue resistance declines. In conclusion, chitosan has shown great potential as a natural substance, biodegradable, biocompatible without toxicity or side effects with antifungal activities with a direct effect on the growth and development of the fungus at the level of conidium and mycelium [64]. The information generated by transcriptome studies in chitosan-pathogen interaction systems indicates the effect of chitosan on metabolic pathways important for the defence of the fruit against the attack of the pathogen and in the fungus, resulting in morphological and biochemical alterations that inhibit the growth and germination of the pathogen.…”

Section: Chitosanmentioning

confidence: 99%

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Extension of Avocado Fruit Postharvest Quality Using Non-Chemical Treatments

2020

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Developing postharvest management techniques using environmentally friendly and non-chemical approaches is key to extending the shelf life of avocados in a safer and health conscious manner. Avocados are prone to postharvest deterioration caused by mechanical damage, chilling injury, soft landing, uneven ripening and decay. Among the different cultivars of avocados commercially grown worldwide, the ‘Hass’ variety continues to be the most predominant due to its nutty flavour and functional properties. Most of the literature on postharvest decay and disorders affecting avocado fruit quality during storage and marketing is dedicated to the Hass avocado. Some of these postharvest problems are unique to the ‘Hass’ avocado can possibly be controlled by simply investing more research into other cultivars. These postharvest losses can be significantly controlled using eco-friendly technologies, such as modified atmosphere, physical heat treatments and most importantly investing in natural biodegradable products with naturally inherent antimicrobial properties. Thus, this review includes the recent research-based information on the use of non-chemical treatments on the improvement of fruit health and quality.

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Effects of chitosan treatment on avocado postharvest diseases and expression of phenylalanine ammonia-lyase, chitinase and lipoxygenase genes

Cited by 80 publications

References 27 publications

Prospect of Polysaccharide-Based Materials as Advanced Food Packaging

Prospect of Polysaccharide-Based Materials as Advanced Food Packaging

Matrine-chitosan hydrogels for treating subclinical bovine mastitis by intramammary infusion—effect on milk microbiome and metabolites

Extension of Avocado Fruit Postharvest Quality Using Non-Chemical Treatments

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