Optimization of water absorbing exopolysaccharide production on local cheap substrates by Bacillus strain CMG1403 using one variable at a time approach

Muhammadi, .; Afzal, Muhammad Sohail

doi:10.1007/s12275-014-2622-6

Cited by 14 publications

(4 citation statements)

References 26 publications

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“…It would allow reducing production costs at the same time of giving added value to non-valuable wastes or sub-products with scarce commercial value, what entails a revalorization of these alternative substrates. Additionally, their conversion into high-added-value bio products (EPS) would also contribute to the mitigation of the environmental impact generated by their eventual disposal in nature (Fernandes Silva et al, 2009; Taskin et al, 2011; Abdul Razack et al, 2013; Muhammadi and Afzal, 2014). …”

Section: Reviewing the Knowledge And Advances On Scleroglucan Productionmentioning

confidence: 99%

Microbial production of scleroglucan and downstream processing

2015

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Synthetic petroleum-based polymers and natural plant polymers have the disadvantage of restricted sources, in addition to the non-biodegradability of the former ones. In contrast, eco-sustainable microbial polysaccharides, of low-cost and standardized production, represent an alternative to address this situation. With a strong global market, they attracted worldwide attention because of their novel and unique physico-chemical properties as well as varied industrial applications, and many of them are promptly becoming economically competitive. Scleroglucan, a β-1,3-β-1,6-glucan secreted by Sclerotium fungi, exhibits high potential for commercialization and may show different branching frequency, side-chain length, and/or molecular weight depending on the producing strain or culture conditions. Water-solubility, viscosifying ability and wide stability over temperature, pH and salinity make scleroglucan useful for different biotechnological (enhanced oil recovery, food additives, drug delivery, cosmetic and pharmaceutical products, biocompatible materials, etc.), and biomedical (immunoceutical, antitumor, etc.) applications. It can be copiously produced at bioreactor scale under standardized conditions, where a high exopolysaccharide concentration normally governs the process optimization. Operative and nutritional conditions, as well as the incidence of scleroglucan downstream processing will be discussed in this chapter. The relevance of using standardized inocula from selected strains and experiences concerning the intricate scleroglucan scaling-up will be also herein outlined.

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Section: Reviewing the Knowledge And Advances On Scleroglucan Productionmentioning

confidence: 99%

Microbial production of scleroglucan and downstream processing

2015

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“…Molasses contains mostly sugars like sucrose, glucose, and fructose comprising up to 50% [5]. It was investigated as a carbon source for polyhydroxyalkanoates [6], polyhydroxybutyrate (PHB) [7], cellulose [8], and xanthan [9] production and biopolymers having different sugar contents reported [10][11][12][13]. On the other hand, alginate production from molasses was comparably rare.…”

Section: Introductionmentioning

confidence: 99%

Alginate Production from Alternative Carbon Sources and Use of Polymer Based Adsorbent in Heavy Metal Removal

Moral

Yıldız

2016

International Journal of Polymer Science

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Alginate is a biopolymer composed of mannuronic and guluronic acids. It is harvested from marine brown algae; however, alginate can also be synthesized by some bacterial species, namely,AzotobacterandPseudomonas. Use of pure carbohydrate sources for bacterial alginate production increases its cost and limits the chance of the polymer in the industrial market. In order to reduce the cost of bacterial alginate production, molasses, maltose, and starch were utilized as alternative low cost carbon sources in this study. Results were promising in the case of molasses with the maximum 4.67 g/L of alginate production. Alginates were rich in mannuronic acid during early fermentation independent of the carbon sources while the highest guluronic acid content was obtained as 68% in the case of maltose. The polymer was then combined with clinoptilolite, which is a natural zeolite, to remove copper from a synthetic wastewater. Alginate-clinoptilolite beads were efficiently adsorbed copper up to 131.6 mg Cu2+/g adsorbent at pH 4.5 according to the Langmuir isotherm model.

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“…could be used for water and wastewater treatment due to their bioflocculant activity. Bacterial bioflocculants are able to remove easily pollutants organic or inorganic, turbidity, colour, even pathogens [9,23,25,26].…”

Section: Discussionmentioning

confidence: 99%

Isolation and Identification of Bioflocculant-Producing Bacteria From Cassava Cultivated Soil of Viet Nam

Hong

Cường

2021

Vietnam J. Sci. Technol.

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Microorganisms are found everywhere in the environment and play a leading role in countless natural processes, and amongst them, soil microorganisms play important roles in plant performance by improving mineral nutrition. Soil bacteria possess different biological activities; for example, producing bioactive compounds such as bioflocculant which makes soil smoother and more breathable, as plant growth stimulants or compounds with antibiotic activity. Beside this, the same soil bacteria could also be able to fix atmospheric nitrogen, converting it into the form that plants can use. In order to make a microbial formula from local bacteria capable of producing bioflocculant as well as IAA and fixing nitrogen towards microbial organic fertilizer production for application in cassava cultivation, the bacteria were isolated from cassava cultivated soils and screened for above mention activities. From 37 cassava root and cassava cultivated soil samples collected at different provinces in the North, Central and South regions of Vietnam, 80 strains of bacteria with bioflocculant activity over 50% were screened. In which 3 strains (ĐQT1 Po6, ĐTAN6 Po2 and ĐSBV Po1) possess not only high bioflocculant and IAA producing capacities, but also the ability to fix atmospheric nitrogen. The flocculant rate of these strains was 80÷90% and can produce 6÷11 µg/mL IAA. The selective strains were identified by having an analysis of 16S rRNA gene sequence. The obtained results showed that the 16S rRNA sequence of ĐQT1 Po6 was 100% identifiable to corresponding sequence of Bacillus aryabhattai FORT 21 (Ass.No MG561348.1); and the 16S rRNA sequences of ĐTAN6 Po2 and ĐSBV Po1 had 100% homology with those of Enterobacter sp. (Ass.No KJ184880.1) and Bacillus subtilis SAN1.5 (Ass.No KX098457.1), respectively. These strains are potential candidates as perfect inoculant for biofertilizer.

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Optimization of water absorbing exopolysaccharide production on local cheap substrates by Bacillus strain CMG1403 using one variable at a time approach

Cited by 14 publications

References 26 publications

Microbial production of scleroglucan and downstream processing

Microbial production of scleroglucan and downstream processing

Alginate Production from Alternative Carbon Sources and Use of Polymer Based Adsorbent in Heavy Metal Removal

Isolation and Identification of Bioflocculant-Producing Bacteria From Cassava Cultivated Soil of Viet Nam

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