Chemical and rheological properties of exopolysaccharides produced by four isolates of rhizobia

Moretto, Cristiane; Castellane, Tereza Cristina Luque; Lopes, Érica Mendes; Omori, Wellington Pine; Sacco, Laís Postai; Lemos, Eliana Gertrudes de Macedo

doi:10.1016/j.ijbiomac.2015.07.056

Cited by 27 publications

(12 citation statements)

References 34 publications

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“…On the other hand, Wu et al [26] observed that sphingan Ss, produced by Sphingomonas sanxanigenens NX02, promoted formation of 100% emulsified layers stably with diesel when its concentration exceeded 1000 mg L -1 (0.1%, w/v) at room temperature. Aiming to achieve optimal results, changes in pH, made in our study, were valuable, observing the best result for diesel oil at a pH of 11, which was similar to results found by Moretto et al [8].…”

Section: Discussionsupporting

confidence: 87%

“…Nevertheless, the EPS from Salipiger mucosus A3, used as bioemulsifier for the same hydrocarbon by Llamas et al [23], showed a lower emulsifying index than the one we found; even though the authors obtained an E 24 = 70%; it was not stable after 24 h. Good results could be found for hexane, for two tested concentrations, similar to results found by Freitas et al [9]. Differently, comparing our results with the bioemulsifiers studied by Moretto et al [8] at 1 g L -1 of EPS, we can note that their emulsifying indexes (E 24 ) ranged around 20%.…”

Section: Discussionsupporting

confidence: 78%

“…Even though we reached emulsifying indexes above 50% with 2 mg EPS per mL of diesel oil, other authors such as [8,24,25] had difficulties to emulsify the same hydrocarbon. On the other hand, Wu et al [26] observed that sphingan Ss, produced by Sphingomonas sanxanigenens NX02, promoted formation of 100% emulsified layers stably with diesel when its concentration exceeded 1000 mg L -1 (0.1%, w/v) at room temperature.…”

Section: Discussioncontrasting

confidence: 58%

“…These water-soluble carbohydrate polymers have a wide range of functional properties. They are able to modify aqueous solution properties by thickening, being also used as chelating, emulsifier, or stabilizer agents [7,8]. In recent years, many microbial polymers have been used as bioemulsifiers due to their ability to stabilize emulsions between water and hydrophobic compounds [9].…”

Section: Introductionmentioning

confidence: 99%

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Production, Characterization and Bioemulsifying Activity of an Exopolysaccharide Produced by Sphingomonas sp. Isolated from Freshwater

et al. 2016

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This study aimed to evaluate the emulsion stability of solutions containing exopolysaccharide and culture medium of a Sphingomonas sp. strain with various hydrophobic compounds. The exopolysaccharide characterized belongs to a sphingan group, however, not being a gellan gum as produced by certain Sphingomonas strains. In general, the emulsifying indexes found in this study were above 70% for gasoline, hexane, kerosene and used frying oil. Nonetheless, the best results were achieved in kerosene solutions, which showed an index of 80% after 24 h, remaining stable for more than 168 h in combinations with various EPS concentrations. Interestingly, diesel oil best results were singly achieved in solution pH of 11, showing an index of around 65%. Furthermore, hexane obtained an index of 100% after 24 h when culture medium was used. Thus, these findings highlight the use of EPS as a potential bioemulsifier agent to enhance hydrocarbon degradation and emulsification effects in environmental biotechnology.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionsupporting

confidence: 78%

Section: Discussioncontrasting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

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Production, Characterization and Bioemulsifying Activity of an Exopolysaccharide Produced by Sphingomonas sp. Isolated from Freshwater

et al. 2016

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“…Some fungi have been reported to be able to produce EPS, which are potential as food additives such as Sporobolomyces salmonicolor AL1 as thickener or gelatinizer (Pavlova et al 2004) and Rizobium tropici LBMP-C01 as emulsifier (Moretto et al 2015). However, the EPS yield of those fungi were varied without any clear relationship between the yield and the type of fungal strain (Mahapatra and Banerjee 2012).…”

Section: Introductionmentioning

confidence: 99%

Phenotypic and genotypic characteristics of exopolysaccharide-producing fungi as a source of food additives

et al. 2019

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Abstract. Akroman R, Nurhayati N, Suwasono S, Jayus J. 2019. Phenotypic and genotypic characteristics of exopolysaccharide-producing fungi as a source of food additives. Biodiversitas 20: 2468-2474. As the demand for materials suitable for edible film in food processing is increasing, the exploration of exopolysaccharide (EPS) producing fungi is important. Some fungi had been reported to produce extracellular polysaccharide having rheological properties potential as thickener and or plasticizer useful for edible film raw material. Therefore, this study was focused on isolation and identification of EPS-producing fungi from the plantation area surrounding the University of Jember, Indonesia. The fungal isolate obtained was morphologically identified based on mycelia and spore type, while its genotype was determined using ITS1 and ITS4 primers. The optimum initial culture pH for EPS production was measured using shake flask culture fermentation. The rheological properties of the EPS were determined using Brookfield viscometer, and surface structure of EPS was observed using a scanning electron microscope (SEM). The result showed that the mycelium of the isolate was reddish-brown and septated, its spores were formed as conidiospores. Internal Transcribed Spacer (ITS) sequence of the fungus showed that the isolate is a new species. Therefore, it was designated as C. lunata isolate RJ01. Optimum initial pH for EPS production was pH 6.0, achieved after 5 days fermentation yielded 2.6 g L-1 of EPS. The EPS from C. lunata isolate RJ01 have no cytotoxic activity on vero cell. The rheological behaviour of C. lunata EPS was viscous, and its surface structure of EPS was compact indicating its potency as thickening agent and plasticizer, a material required for edible film formation in food industries.

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Introduction to Emerging Natural Hydrocolloids

Razavi

2019

Emerging Natural Hydrocolloids

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Chemical and rheological properties of exopolysaccharides produced by four isolates of rhizobia

Cited by 27 publications

References 34 publications

Production, Characterization and Bioemulsifying Activity of an Exopolysaccharide Produced by Sphingomonas sp. Isolated from Freshwater

Production, Characterization and Bioemulsifying Activity of an Exopolysaccharide Produced by Sphingomonas sp. Isolated from Freshwater

Phenotypic and genotypic characteristics of exopolysaccharide-producing fungi as a source of food additives

Introduction to Emerging Natural Hydrocolloids

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