Effect of extraction procedures on structural, thermal and antioxidant properties of ulvan from Ulva lactuca collected in Monastir coast

Yaich, Héla; Amira, Amal Ben; Abbes, F.; Bouaziz, Mohamed; Besbes, Souhail; Richel, Aurore; Blecker, Christophe; Attia, Hamadi; Garna, Haikel

doi:10.1016/j.ijbiomac.2017.07.141

Cited by 115 publications

(85 citation statements)

References 37 publications

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“…Rhamnose is the main sugar of ulvan fraction (Korzen et al, 2015), and it is necessary the addition of water solutions with low pH at 80-90°C for its extraction (Yaich et al, 2017). Cellulase could improve ulvan extraction, but followed by hot water extraction and using a high load of enzyme (700 U/g) (Yaich et al, 2017). Thus, in the present study, the hydrolysis of rhamnose was low because the insufficient load of enzyme or performance of a suitable pre-treatment.…”

Section: Enzymatic Hydrolysis and Ssf Followed By Sequential Enzymatimentioning

confidence: 73%

“…A synergistic effect of crude extracts mixture with commercial enzymes was also observed in the hydrolysis of poplar biomass, where the release of sugars was 20% more efficient than when using only commercial extracts (Celluclast 1.5L and Novozyme 188) (Jagtap et al, 2014). Rhamnose is the main sugar of ulvan fraction (Korzen et al, 2015), and it is necessary the addition of water solutions with low pH at 80-90°C for its extraction (Yaich et al, 2017). Cellulase could improve ulvan extraction, but followed by hot water extraction and using a high load of enzyme (700 U/g) (Yaich et al, 2017).…”

Section: Enzymatic Hydrolysis and Ssf Followed By Sequential Enzymatimentioning

confidence: 87%

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Sequential bioprocessing of Ulva rigida to produce lignocellulolytic enzymes and to improve its nutritional value as aquaculture feed

Fernandes

Salgado

Martins

et al. 2019

Bioresource Technology

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A B S T R A C TThe macroalgae aquaculture industry has grown up in the last years, and new applications for macroalgae should be considered. In this work, sequential biological treatments as solid-state fermentation (SSF) by Aspergillus ibericus and enzymatic hydrolysis (EH) were applied to washed and unwashed Ulva rigida. SSF of unwashed macroalgae showed higher xylanase (359.8 U/g), cellulase (73.07 U/g) and β-glucosidase (14.9 U/g) activities per dry mass of macroalgae. After SSF, two strategies to carry out EH were assayed. The best process was SSF followed by EH by simply adding a buffer. The non-starch polysaccharides content was reduced by 93.2%, achieving a glucan conversion of 98%. In addition, the antioxidant activity was improved 2.8-fold and the protein concentration of macroalgae extracts increased from 16.9% to 29.8% (w/w). These biological treatments allowed to increase macroalgae value as feedstuff with potential for use in aquafeeds. 2015). Even thought, macroalgae are usually dried to be preserved, SSF

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Section: Enzymatic Hydrolysis and Ssf Followed By Sequential Enzymatimentioning

confidence: 73%

Section: Enzymatic Hydrolysis and Ssf Followed By Sequential Enzymatimentioning

confidence: 87%

Sequential bioprocessing of Ulva rigida to produce lignocellulolytic enzymes and to improve its nutritional value as aquaculture feed

Fernandes

Salgado

Martins

et al. 2019

Bioresource Technology

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show abstract

“…In agreement with this difference, a valuable polyphenol content (53.5 ± 5.0 mg GAE g −1 lyophilized alga) was measured in F. spiralis samples employed in the current study, while U. lactuca showed a markedly lower polyphenol content (0.7 ± 0.6 mg GAE g −1 lyophilized alga). However, previous research has reported on the antioxidant behaviour of U. lactuca , this activity being explained by the presence of preservative molecules such as tocopherols, carotenoids, phenolic compounds, and sulfates …”

Section: Resultsmentioning

confidence: 96%

Preservative Effect of Algae Extracts on Lipid Composition and Rancidity Development in Brine‐Canned Atlantic Chub Mackerel (Scomber colias)

Barbosa¹,

Trigo²,

Campos

et al. 2019

Euro J Lipid Sci & Tech

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This research focuses on the lipid fraction and the rancidity stability of commercial canned Atlantic Chub mackerel (Scomber colias). For it, two different concentrations of aqueous extracts of two abundant algae (Fucus spiralis and Ulva lactuca) are included in the brine‐packing (aq. 2% NaCl) medium during mackerel canning. Quality analyses are carried out after a 3‐month canned storage (20 °C). Phospholipids, sterols, and α‐tocopherol contents show a marked loss as a result of canning, this loss being mostly inhibited when considering the canned fish packed in the presence of the most concentrated algae extracts. Breakdown of free fatty acids and peroxides produced during the thermal treatment is inhibited by the presence of the algae extracts, a higher retention of such molecules being observed by increasing the algae extract concentration. Analysis of fluorescent compounds formation (tertiary lipid oxidation) shows a marked increase after canning, this increase being partly inhibited by the presence of antioxidant compounds present in the algae extracts; interestingly, oxidation inhibition is found more important in canned fish corresponding to F. spiralis batches than U. lactuca. A preservative effect on lipid constituents and rancidity development is concluded by the presence of algae extracts in the packing medium. Practical Applications: The extensive heat treatment involved during fish canning has been reported to produce breakdown of constituents, lipid damage (oxidation and hydrolysis) development showing a marked effect on nutritional and sensory properties; furthermore, this effect has shown to be greater when a brine medium is applied as packing system. Marine algae have been described as being a relevant source of chemical constituents including an antioxidant and antibacterial behavior. In the current work, employment of a commercial brine‐packing including aqueous algae extracts shows a preservative effect on the lipid fraction (composition and rancidity stability) during the canning process of Atlantic Chub mackerel. The proposed strategy may open the way to the development of a natural biopreservation for commercial canned fish due to the simple methodology employed and the abundancy of the two algae chosen for the study. Further research should envisage optimization of the preservative compounds extraction by advanced technologies. Aqueous extracts of algae Fucus spiralis and Ulva lactuca are included in the packing medium during Atlantic Chub mackerel (Scomber colias) canning. As a result, an inhibitory effect on lipid composition changes and rancidity development is obtained. Better results are observed by employing alga F. spiralis.

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“…Ulvans are water-soluble sulfated heteropolysaccharides, mainly constituted by disaccharide repeated units formed by D-glucuronic or L-iduronic acid linked to L-rhamnose-3-sulfate [47]. These polymers exhibit a broad range of biological activities, a notable example being the antioxidant one [47][48][49].…”

Section: Anti-pollution Ingredients From Algaementioning

confidence: 99%

“…These polymers exhibit a broad range of biological activities, a notable example being the antioxidant one [47][48][49]. The antioxidant properties of ulvans are influenced by the extraction procedures and depend on the carbohydrate composition and the sulfate content, since ulvans with higher sulfate content show a significantly higher antioxidant activity [47,49].…”

Section: Anti-pollution Ingredients From Algaementioning

confidence: 99%

Cosmetic Functional Ingredients from Botanical Sources for Anti-Pollution Skincare Products

Juliano

Magrini

2018

Cosmetics

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Air pollution is a rising problem in many metropolitan areas around the world. Airborne contaminants are predominantly derived from anthropogenic activities, and include carbon monoxide, sulfur dioxide, nitrogen oxides, volatile organic compounds, ozone and particulate matter (PM; a mixture of solid and liquid particles of variable size and composition, able to absorb and delivery a large number of pollutants). The exposure to these air pollutants is associated to detrimental effects on human skin, such as premature aging, pigment spot formation, skin rashes and eczema, and can worsen some skin conditions, such as atopic dermatitis. A cosmetic approach to this problem involves the topical application of skincare products containing functional ingredients able to counteract pollution-induced skin damage. Considering that the demand for natural actives is growing in all segments of global cosmetic market, the aim of this review is to describe some commercial cosmetic ingredients obtained from botanical sources able to reduce the impact of air pollutants on human skin with different mechanisms, providing a scientific rationale for their use.

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Effect of extraction procedures on structural, thermal and antioxidant properties of ulvan from Ulva lactuca collected in Monastir coast

Cited by 115 publications

References 37 publications

Sequential bioprocessing of Ulva rigida to produce lignocellulolytic enzymes and to improve its nutritional value as aquaculture feed

Sequential bioprocessing of Ulva rigida to produce lignocellulolytic enzymes and to improve its nutritional value as aquaculture feed

Preservative Effect of Algae Extracts on Lipid Composition and Rancidity Development in Brine‐Canned Atlantic Chub Mackerel (Scomber colias)

Cosmetic Functional Ingredients from Botanical Sources for Anti-Pollution Skincare Products

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