Radiation synthesis and characterization of xanthan gum hydrogels

Hayrabolulu, Hande; Demeter, Mária; Cutrubinis, Mihalis; Şen, Murat

doi:10.1016/j.radphyschem.2021.109613

Cited by 7 publications

(4 citation statements)

References 34 publications

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“…Xanthan of higher average molecular weight was produced when cultivation of applied strains was performed for 240 h. Despite the fact that increase in cultivation time does not lead to increase in xanthan concentration, as shown in Fig. 2 (b), it can be assumed that increasing of the average molecular weight of produced biopolymer is the result of the formation of double or triple helices [29].…”

Section: Effect Of Xanthomonas Strains and Cultivation Time On Xantha...mentioning

confidence: 97%

“…4 (a), it can be concluded that both quantity and quality of xanthan produced by X. campestris strains isolated from crucifers increase over time. The length of macromolecules depends mainly on biosynthesis pathways and genetic variability of the producing strains [20], but the formation of double or triple helices occurs over time and increases molecular weight of biopolymer [29].…”

Section: Effect Of Xanthomonas Strains and Cultivation Time On Xantha...mentioning

confidence: 99%

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Screening of Local Wild Xanthomonas Species for Xanthan Production on Crude Glycerol-based Medium

Zahović

Dodić²,

Grahovac³

et al. 2022

Period. Polytech. Chem. Eng.

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In this study, the effect of cultivation time on xanthan biosynthesis by different Xanthomonas campestris and Xanthomonas euvesicatoria strains, isolated from crucifers and pepper leaves, respectively, was examined. Xanthan was produced by submerged cultivation on crude glycerol-based medium at a laboratory level under aerobic conditions at 30 °C and 150 rpm for 168 h and 240 h. Bioprocess efficacy was estimated based on the xanthan concentration in media at the end of bioprocess and its average molecular weight. According to the obtained results, Xanthomonas strains have statistically significant effect on xanthan concentration in cultivation media when biosynthesis is performed by X. euvesicatoria strains, and cultivation time has significant effect on this parameter only when bioprocess is performed by X.campestris strains. The combination of Xanthomonas strains and cultivation time has a statistically significant effect on xanthan concentration in medium for both groups of isolates. The obtained results show that all applied Xanthomonas strains and cultivation time as well as their combination have statistically significant effect on average molecular weight of xanthan produced in applied experimental conditions. It is found that X. euvesicatoria strains produce higher amount of xanthan in a shorter period of time (168 h) when compared to the X.campestris strains. Xanthan of higher average molecular weight was produced when cultivation of both groups of isolates was performed for 240 h in applied experimental conditions. Results obtained in this research suggest that X. euvesicatoria strains have the greatest potential for application in biotechnological production of xanthan on crude glycerol-based medium.

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Section: Effect Of Xanthomonas Strains and Cultivation Time On Xantha...mentioning

confidence: 97%

Section: Effect Of Xanthomonas Strains and Cultivation Time On Xantha...mentioning

confidence: 99%

Screening of Local Wild Xanthomonas Species for Xanthan Production on Crude Glycerol-based Medium

Zahović

Dodić²,

Grahovac³

et al. 2022

Period. Polytech. Chem. Eng.

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“…For further calculation of hydrogel crosslinking density, the rubber elasticity theory was used [ 33 ]. First, linear region according to the elastic deformation theory force proportional to the deformation was found.…”

Section: Methodsmentioning

confidence: 99%

The Influence of Oxidant on Gelatin–Tannin Hydrogel Properties and Structure for Potential Biomedical Application

2021

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Nowadays, there is a widespread usage of sodium periodate as an oxidant for synthesizing gelatin–tannin hydrogels. The impact of iodine compounds could have a harmful effect on human health. The study focuses on the proposal of alternative oxidizing systems for tannin oxidation. Gelatin–tannin hydrogels were obtained based on the usage of H2O2/DMSO/KMnO4/KIO4 oxidants and characterized with sorption, thermal (TGA, DTG, DSC), mechanical, FTIR and other methods. The sorption experiments were carried out in a phosphate buffer (pH = 5.8/7.4/9) and distilled water and were investigated with Fick’s law and pseudosecond order equation. The pH dependence of materials in acid media indicates the possibility of further usage as stimuli-responsive systems for drug delivery. Thermal transitions demonstrate the variation of structure with melting (306 ÷ 319 °C) and glass transition temperatures (261 ÷ 301 °C). The activation energy of water evaporation was calculated by isoconversional methods (Kissinger–Akahira–Sunose, Flynn–Wall–Ozawa) ranging from 4 ÷ 18 to 14 ÷ 38 kJ/mole and model-fitting (Coats–Redfern, Kennedy–Clark) methods at 24.7 ÷ 45.3 kJ/mole, indicating the smooth growth of values with extent of conversion. The network parameters of the hydrogels were established by modified Flory–Rehner and rubber elasticity theories, which demonstrated differences in values (5.96 ÷ 21.27·10−3 mol/cm3), suggesting the limitations of theories. The sorption capacity, tensile strength and permeability for water/oxygen indicate that these materials may find their application in field of biomaterials.

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“…Comprehensives studies on the γ-radiation of XG in solid and aqueous states were performed by Șen and Hayrabolulu et al They showed that the effect of γ-radiation in air for XG is chain scission, which is effective when the dose rate is decreased due to the enhanced oxidative degradations during irradiation [ 16 , 17 ]. The same research group developed superabsorbent hydrogels based on XG using γ-radiation crosslinking synthesis at very low absorbed dose, such as 1–2 kGy [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Development of Novel Superabsorbent Hybrid Hydrogels by E-Beam Crosslinking

Călina

Demeter

Scărișoreanu

et al. 2021

Gels

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In this study, several superabsorbent hybrid hydrogel compositions prepared from xanthan gum (XG)/sodium carboxymethylcellulose (CMC)/graphene oxide (GO) were synthesized by e-beam radiation crosslinking. We studied and evaluated the effects of GO content from the chemical structure of the hydrogels according to: sol-gel analysis, swelling degree, diffusion of water, ATR-FTIR spectroscopy, network structure, and dynamic mechanical analysis. The gel fraction and swelling properties of the prepared hydrogels depended on the polymer compositions and the absorbed dose. The hybrid XGCMCGO hydrogels showed superabsorbent capacity and reached equilibrium in less than 6 h. In particular, the XGCMCGO (70:30) hydrogel reached the highest swelling degree of about 6000%, at an irradiation dose of 15 kGy. The magnitude of the elastic (G′) and viscous (G″) moduli were strongly dependent on the absorbed dose. When the degree of crosslinking was higher, the G′ parameter was found to exceed 1000 Pa. In the case of the XGCMCGO (80:20) hydrogel compositions, the Mc and ξ parameters decreased with the absorbed dose, while crosslinking density increased, which demonstrated that we obtained a superabsorbent hydrogel with a permanent structure.

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Radiation synthesis and characterization of xanthan gum hydrogels

Cited by 7 publications

References 34 publications

Screening of Local Wild Xanthomonas Species for Xanthan Production on Crude Glycerol-based Medium

Screening of Local Wild Xanthomonas Species for Xanthan Production on Crude Glycerol-based Medium

The Influence of Oxidant on Gelatin–Tannin Hydrogel Properties and Structure for Potential Biomedical Application

Development of Novel Superabsorbent Hybrid Hydrogels by E-Beam Crosslinking

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