The Influence of Water Content on the Action of Ionizing Radiation on Starch.

Ehrenberg, L.; Jaarma, Maire; Zimmer, E.C.

doi:10.3891/acta.chem.scand.11-0950

Cited by 41 publications

(4 citation statements)

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“…The determination of average degradation yield was performed by using the slope of (1/M n À 1/M n0 ) plotted against irradiation dose in the range 10-50 kGy. The obtained value of (3.6 AE 0.5) Â 10 À7 mol/J is in the same range as other values previously reported for amylose ((1.4-14) Â 10 À7 mol/J) [22][23][24][25]. However, differences in the degradation yield values are possible due to the moisture content, degree of crystallinity, and environmental conditions during irradiation (presence or absence of oxygen, temperature), solvents and methods used for molecular weight determination [25,26] as well as the initial molecular weight.…”

Section: Quantitative Determination Of the Radiation Degradation Kinesupporting

confidence: 89%

Degradation of amylose by ionizing radiation processing

Nemţanu

Braşoveanu

2016

Starch Stärke

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The current study brings to light new aspects of degradation of polysaccharides by physical methods, namely degradation of amylose exposed in the solid state to the accelerated electron beam, in the presence of oxygen, in the range of 10-50 kGy. Effects of irradiation on amylose were investigated by gel-permeation chromatography, Fourier transform infrared spectroscopy, and scanning electron microscopy. In order to evaluate quantitatively, the radiation degradation of amylose, radiochemical yield of degradation, degradation rate constant, and half value dose of molecular weights were determined. The results indicated the main-chain scission of amylose, which led to the reduction of its molecular weight and molecular weight distribution. Changes of amylose spectral features related to the frequency and intensity of some bands indicated an alteration of the structural integrity induced by the electron beam. The scanning electron micrographs revealed the appearance of smaller fragments by amylose structure disruption as a result of irradiation. Consequently, degradation of amylose in the solid state can effectively be controlled by electron beam irradiation. This novel study may be a useful starting point for preparation or processing of amylose-based matrices by using electron beam treatment.

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Section: Quantitative Determination Of the Radiation Degradation Kinesupporting

confidence: 89%

Degradation of amylose by ionizing radiation processing

Nemţanu

Braşoveanu

2016

Starch Stärke

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“…A protective effect has been observed before for other macromolecules and is often attributed to energy transfer from the macromolecule to the adsorbed water molecules (or in some cases other small molecules adsorbed to the macromolecule) (Ehrenberg et al, 1957). This would apply mainly to excited states originating from the absorption of γ-radiation.…”

Section: Effect Of Irradiation In the Solid Physical Formmentioning

confidence: 86%

The role of water in radiation-induced fragmentation of cellulosic backbone polysaccharides

Muscolino,

Sabatino,

Jonsson

et al. 2023

Cellulose

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Xyloglucan (XG) is a cellulosic backbone polysaccharide commercially used for food applications, but also widely investigated in biomedical applications, for its gelling properties and speci c biological activity. In this study, the possibility of using gamma radiation to cleave XG and generate lower molecular weight variants was explored. The impact of absorbed dose and irradiation conditions on the XG molecular weight distribution was investigated. Two other cellulosic polysaccharides, hydroxypropyl cellulose (HPC) and an oxidized variant of XG (CXG), were also studied for comparison. Before irradiation, the polymers were characterized with thermal gravimetric analysis (TGA) and, after irradiation, with gel ltration chromatography (GFC). The results showed that for XG irradiated in dilute aqueous solution, a dose of 10 Gy is su cient to signi cantly reduce the polymer molecular weight, while HPC is less affected by irradiation under identical conditions. When the polymers were irradiated in the solid form, either dry or humid, the reduction in average molecular weight is much less pronounced. Interestingly, for HPC the cleavage of the chains is more pronounced for the dry than for the humid powder. A similar behavior, but less pronounced, was observed for XG and CXG. Arguably, when water was present in the system as bound water it had a protective effect. This is probably due to energy transfer from the polymer to the bound water preventing chain scission. Indeed, humid HPC has more bound water than XG and CXG. Conversely, when water was present as solvent, water radiolysis products were able to e ciently induce depolymerization.

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“…Effects of ionizing radiation on polymers are a subject of increasing interest in research and development of novel polymeric materials once their chemical and physical properties can be quite affected by induction of crosslinking and/or degradation reactions, crystallinity degree changes, isomerization, etc. (22,23,24). In relation to starch, this polymer undergoes breaking of its glycosidic bonds, that is, degradation (25,26,27), besides having possible modifications of its crystalline structure.…”

Section: Introductionmentioning

confidence: 99%

Influence of Ionizing Radiation on Biodegradable Foam Trays for Food Packaging Obtained from Irradiated Cassava Starch

Brant

Naime

Lugão

et al. 2018

Braz. arch. biol. technol.

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Biodegradable polymers, such as starch, cellulose, and derivatives thereof, are being studied to produce innovative packaging in the most diverse shapes (films, bags, trays, bottles, etc.) to attend this current market trend. The aim of this work was to produce foam trays from cassava starch for food packaging via extrusion followed by thermoforming process. Their formulations were based on unirradiated and γ-irradiated starches at diverse radiation absorbed doses (in kGy) in order to evaluate the influence of the irradiated starches on the physical properties of the trays. Water absorption results showed an irregular increase with the increase of the absorbed dose (for example, 26.32% and 39.84% for the trays based on unirradiated starch 0 kGy and 1:1 (w/w) mixture of starches 0 kGy and 100.0 kGy, respectively). Other physicochemical properties were evaluated from the starches utilized and the trays obtained. Aerobic biodegradation of the foams by mass loss also was checked in soil burial test.

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The Influence of Water Content on the Action of Ionizing Radiation on Starch.

Cited by 41 publications

References 0 publications

Degradation of amylose by ionizing radiation processing

Degradation of amylose by ionizing radiation processing

The role of water in radiation-induced fragmentation of cellulosic backbone polysaccharides

Influence of Ionizing Radiation on Biodegradable Foam Trays for Food Packaging Obtained from Irradiated Cassava Starch

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