Biological properties of water-soluble polysaccharides and hemicelluloses from almond gum

Bouaziz, Fatma; Koubàa, Mohamed; Ghorbel, Raoudha; Châabouni, Semia Ellouz

doi:10.1016/j.ijbiomac.2016.11.104

Cited by 30 publications

(13 citation statements)

References 55 publications

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“…Besides polyphenols, polysaccharides from almond tree gum, mostly containing galactose, arabinose, xylose, mannose, rhamnose, and glucuronic acid as monosaccharide residuals, were explored in the basis of antimicrobial activity, being effective bacteriostatic compounds toward S. aureus, P. aeruginosa, S. Typhimurium, E. faecalis, and E. coli [71]. Moreover, hemicelluloses from the same almond gum have been seen to promote a higher antibacterial activity than polysaccharides in the case of both Gram-positive species, such as Bacillus subtilis, Actinomyces sp., and S. aureus, and Gram-negative species, such as Klebsiella pneumoniae and Salmonella typhi [72]. Such results provide insight about the consideration of almond by-products for their revalorization, not only associated with almond fruits, but also the products obtained from almond trees.…”

Section: Antimicrobial Activitymentioning

confidence: 67%

Almond By-Products: Valorization for Sustainability and Competitiveness of the Industry

Barral-Martinez

Fraga-Corral

García-Pérez

et al. 2021

Foods

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The search for waste minimization and the valorization of by-products are key practices for good management and improved sustainability in the food industry. The production of almonds generates a large amount of waste, most of which is not used. Until now, almonds have been used for their high nutritional value as food, especially almond meat. The other remaining parts (skin, shell, hulls, etc.) are still little explored, even though they have been used as fuel by burning or as livestock feed. However, interest in these by-products has been increasing as they possess beneficial properties (caused mainly by polyphenols and unsaturated fatty acids) and can be used as new ingredients for the food, cosmetic, and pharmaceutical industries. Therefore, it is important to explore almond’s valorization of by-products for the development of new added-value products that would contribute to the reduction of environmental impact and an improvement in the sustainability and competitiveness of the almond industry.

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Section: Antimicrobial Activitymentioning

confidence: 67%

Almond By-Products: Valorization for Sustainability and Competitiveness of the Industry

Barral-Martinez

Fraga-Corral

García-Pérez

et al. 2021

Foods

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“…On the other hand, water-soluble extracts from potato peels with high polysaccharide content (similar to the E2 extracts) showed quite lower bleaching inhibitory capacity (between 30 and 40% when tested at a concentration of 10–50 mg/mL) [48]. Lower inhibition values were also reported for aqueous extracts from almond gum (30–80% when tested at a concentration of 5 mg/mL) [49] and Arundo donax (61–93% when tested at a concentration of 5 mg/mL) [5], again confirming the excellent antioxidant potential of P. oceanica extracts.…”

Section: Resultsmentioning

confidence: 99%

In-Depth Characterization of Bioactive Extracts from Posidonia oceanica Waste Biomass

et al. 2019

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Posidonia oceanica waste biomass has been valorised to produce extracts by means of different methodologies and their bioactive properties have been evaluated. Water-based extracts were produced using ultrasound-assisted and hot water methods and classified according to their ethanol-affinity (E1: ethanol soluble; E2: non-soluble). Moreover, a conventional protocol with organic solvents was applied, yielding E3 extracts. Compositional and structural characterization confirmed that while E1 and E3 extracts were mainly composed of minerals and lipids, respectively, E2 extracts were a mixture of minerals, proteins and carbohydrates. All the extracts showed remarkably high antioxidant capacity, which was not only related to phenolic compounds but also to the presence of proteins and polysaccharides. All E2 and E3 extracts inhibited the growth of several foodborne fungi, while only E3 extracts decreased substantially the infectivity of feline calicivirus and murine norovirus. These results show the potential of P. oceanica waste biomass for the production of bioactive extracts.

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“…These compounds rely on water for movement and bioavailability in biological interactions. The bioactive water-soluble components of seed exudates can exert either beneficial or antagonistic actions resulting in strategies for plant protection [26, 27] and the notion of disease suppressiveness in soils [28–30]. Weedy plant species, many with high fecundity and seed production, collectively contribute to large annual deposits of seeds, resulting in the so-called seed bank that can persist for years in some species [31–33].…”

Section: Introductionmentioning

confidence: 99%

Water-soluble exudates from seeds of Kochia scoparia exhibit antifungal activity against Colletotrichum graminicola

2019

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Plant seed exudates are composed of complex mixtures of chemicals with potential for bioactive compounds with antimicrobial properties. This study focused on kochia ( Kochia scoparia ), one of many weedy plant species considered invasive in many agricultural systems. Extraction of compounds in water yielded an exudate mass equivalent to 7% of the original seed mass used. Water-soluble exudates were tested against 16 known plant pathogens in disk diffusion assays and kochia exudates were found to inhibit Colletotrichum graminicola , the fungal causative agent of anthracnose and stalk rot in maize. The narrow range of fungi found as targets suggested the mechanism of inhibition may be specific rather than broadly antifungal. A decline in viability of cells over four orders of magnitude occurred within six hours of exposure to exudate. The minimum inhibitory concentration was 3.125 mg L -1 . Hyphae formation in C . graminicola appeared inhibited following exposure to the exudate. Small molecular weight compounds as determined by GC/MS analysis showed high relative amounts of the sugars fructose, galactopyranose, glucose, and sorbitol, along with moderate proportions of organic acids and amino acids. Protein content averaged 0.7% in the standard concentration (100 mg mL -1 ) used for inhibition assays. Size fractionation of the exudate and subsequent disk diffusion assays revealed bioactive fractions with compounds in the MW range <5 kDa. To the best of our knowledge, this study is the first to show promising bioactivity against C . graminicola that was associated with water-extractable compounds from a common weed species. The results suggest that seeds of persistent plant species with long-lived seed banks like kochia may have potential for use in the discovery of compounds active in inhibiting fungal pathogens.

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Biological properties of water-soluble polysaccharides and hemicelluloses from almond gum

Cited by 30 publications

References 55 publications

Almond By-Products: Valorization for Sustainability and Competitiveness of the Industry

Almond By-Products: Valorization for Sustainability and Competitiveness of the Industry

In-Depth Characterization of Bioactive Extracts from Posidonia oceanica Waste Biomass

Water-soluble exudates from seeds of Kochia scoparia exhibit antifungal activity against Colletotrichum graminicola

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