Effect of G/M ratio on the radiation-induced degradation of sodium alginate

Şen, Murat; Rendevski, Stojan; Kavaklı, Pınar Akkaş; Sepehrianazar, Amir

doi:10.1016/j.radphyschem.2009.08.028

Cited by 25 publications

(4 citation statements)

References 13 publications

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“…The origin and type of polysaccharide are also relevant. For instance, it has been reported that alginates depolymerize even under lower doses of gamma irradiation (0.5-10 kGy) [60][61][62][63]. It is possible that the presence of carboxyl groups in alginate residues increases the production of radical species, leading to further depolymerization [64].…”

Section: Structural Analysis Of Dextrin and Odexmentioning

confidence: 99%

“…It is possible that the presence of carboxyl groups in alginate residues increases the production of radical species, leading to further depolymerization [64]. Moreover it has been demonstrated that guluronic acid/mannuronic acid ratio is an important factor for controlling the degradation rate of sodium alginate [62,63]. Concerning to dextrin, only one report was found [52].…”

Section: Structural Analysis Of Dextrin and Odexmentioning

confidence: 99%

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Effects of gamma irradiation and periodate oxidation on the structure of dextrin assessed by mass spectrometry

Pereira

Simões

Evtuguin

et al. 2018

European Polymer Journal

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A B S T R A C TSterilization of biomaterials by gamma irradiation should not change its structure, since this may affect also its bioactivity. In this work, dextrin and periodate-oxidized dextrin (ODEX), both irradiated and non-irradiated, were hydrolysed by α-amylase and the obtained oligosaccharides were fractionated by ligand-exchange/size exclusion chromatography and analyzed by matrix-assisted laser desorption/ionization (MALDI-MS) and electrospray ionization (ESI-MS n ) mass spectrometry. This allowed the identification of structures formed during partial periodate oxidation, which displayed aldehyde groups in different positions of dextrin backbone, according to the type of residue which was oxidized. Importantly, gamma irradiation did not structurally change either dextrin or ODEX, showing that it can be used as suitable terminal sterilization method of these materials for biomedical applications. To our best knowledge, this is the first report using MS-based techniques to evaluate the effects of partial periodate oxidation and of gamma irradiation on polysaccharides and, in particular, on dextrin and its oxidized form.to the formation of two aldehyde groups [11]. Initially, this method was routinely used in the characterization and elucidation of the polysaccharide structure through complete oxidation [11]. In later years, low and mild periodate oxidations have been used to functionalize (J. Simões), dmitrye@ua.pt (D.V. Evtyugin), sophie.rouif@ionisos.fr (S. Rouif), mac@ua.pt (M.A. Coimbra), mrd@ua.pt (M.R.M. Domingues), fmgama@deb.uminho.pt (M. Gama).

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Section: Structural Analysis Of Dextrin and Odexmentioning

confidence: 99%

Section: Structural Analysis Of Dextrin and Odexmentioning

confidence: 99%

Effects of gamma irradiation and periodate oxidation on the structure of dextrin assessed by mass spectrometry

Pereira

Simões

Evtuguin

et al. 2018

European Polymer Journal

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“…The effect of configuration of NaAlg was considered by the authors. Radiation induced degradation of sodium alginate (NaAlg) having different G/M ratios was investigated for the first time Şen et al [14].…”

Section: Effect Of Mannose-to-galactose Ratio (M/g) On the Radiation mentioning

confidence: 99%

“…The modified Jellinek equation [30] was used by Şen et al [14] in the determination of degradation rate. Degradation rate constants for NaAlgs were determined by using the curves (1/ )-(1/ ) versus dose.…”

Section: Effect Of Guluronic Acid/mannuronic Acid Ratio (G/m) On the mentioning

confidence: 99%

Effects of polysaccharide structural parameters on radiation-induced degradation

Şen¹,

Taşkın²,

Güven³

2014

HJBC

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Ö zellikle son on yılda kappa karragenan, sodyum aljinat [1-4] ve kitosan'ın [5-10] düşük molekül ağırlıklı fraksiyonlarının ya da oligosakkaritlerinin katı halde ve farklı çözelti derişimlerinde radyasyonla hızlandırılmış bozunma ile hazırlanması, modifikasyonu ve hazırlanan bu fraksiyonların bitki büyütme hızlandırıcısı, bitki koruyucusu olarak ve doku mühendisliği uygulamalarında kullanılmasına yönelik yoğun bir ilgi vardır. Ancak ne polisakkaritlerin radyasyonla uyarılmış bozunma çalışmalarında ne de sodyum aljinat, kitosan, galaktomannan oligosakkaritlerinin bitki büyütme hızlandırıcısı ve bitki koruyucusu olarak hazırlanması konusunda [10-12] yapılan diğer çalışmalarda polisakkarit'in yapısal parametrelerinin etkisi konusu bugüne kadar yazarlar tarafından dikkate alınmamıştır. Şen ve arkadaşları tarafından yapılan son çalışmalarda [13-15] literatürdeki bu boşluk kapatılmış ve polisakkaritlerin radyasyonla uyarılmış bozunmasına yapısal parametrelerin etkisi ayrıntılarıyla açıklanmıştır. Yakın zamanda yapılan tüm bu çalışmalar bu derlemede özetlenmiştir.

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pHstimuli‐responsive poly(acrylamide‐co‐sodium alginate) hydrogels prepared by γ‐radiation for improved compressive strength of concrete

Ghobashy¹,

Bassioni

2017

Adv Polym Technol

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Cross-linking of superabsorbent hydrogels based on poly(acrylamideco-sodium alginate) is carried out using 60 Co γ-radiation. Hydrogels of PAM/NaAlg with 1.5:0.5 and 1.0:1.0 w/v concentrations showed good gel contents of 87 and 66 (%) and swelling degrees in water of 3.7 and 5 (g/g) after 40 min, respectively. The chemical structure of the hydrogel is confirmed by FTIR, XRD, and ESR. The morphology of the hydrogel is observed using scanning electron microscopy. Intramolecular H-bonding in the hydrogel network is confirmed by TGA and DSC. The pH-responsive swelling behavior of (PAMco-NaAlg) hydrogels is tested in different pH ranges showing higher swelling capacities in basic than in acidic media. This property proposes the use of (PAMco-NaAlg) hydrogel as internal curing agent for concrete.The hydrogel is examined with cement weight ratios of (0.1-0.5) wt%. The study shows that cement with (PAMco-NaAlg) hydrogel improves the compressive strength of cement at 0.1 and 0.2 wt%. K E Y W O R D Sγ-radiation, cement, hydrogel, internal curing, smart polymer, sodium alginate How to cite this article: Ghobashy MM, Bassioni G. pH stimuli-responsive poly(acrylamideco-sodium alginate) hydrogels prepared by γ-radiation for improved compressive strength of concrete. Adv Polym

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Effect of G/M ratio on the radiation-induced degradation of sodium alginate

Cited by 25 publications

References 13 publications

Effects of gamma irradiation and periodate oxidation on the structure of dextrin assessed by mass spectrometry

Effects of gamma irradiation and periodate oxidation on the structure of dextrin assessed by mass spectrometry

Effects of polysaccharide structural parameters on radiation-induced degradation

pHstimuli‐responsive poly(acrylamide‐co‐sodium alginate) hydrogels prepared by γ‐radiation for improved compressive strength of concrete

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