Synergistic degradation to prepare oligochitosan by γ-irradiation of chitosan solution in the presence of hydrogen peroxide

Preparation and Foliar Application of Oligochitosan - Nanosilica on the Enhancement of Soybean Seed Yield

“…It can be also observed in Fig. 1 that radiation degradation of chitosan in solution containing H2O2 is more effective in comparison with that of noncontaining H2O2 due to synergistic effect, and the same results were also reported by the other studies [17,22]. This process has been put into large-scale production of oligochitosan (OC) with capacity of 500 L day 1 for field application as biotic plant elicitor and plant growth promoter for rice, sugarcane, ect.…”

“…Oligochitosan was prepared by gamma Co-60 ray irradiation degradation method as described in our previous paper [17] with some modifications. Briefly, chitosan (4 g) was dissolved in 80 ml of 2% (w/v) lactic acid solution, then 1.5 ml of hydrogen peroxide (30% H2O2) and 18.5 ml water were added to prepare 4% chitosan (w/v) solution containing 0.5% H2O2 (w/v).…”

“…The standards for calibration of the columns were pullulan. The eluent was aqueous solution 0.25 M CH3COOH/0.25 M CH3COONa with the flow rate of 1 ml min 1 and temperature at 30 o C [17]. IR spectra were taken on an FT-IR 8400S spectrometer (Shimadzu, Japan) using KBr pellets.…”

Influence of Poly (Ethylene Glycol) on the Characteristics of γ Radiation-Crosslinked Poly (Vinyl Pyrrolidone)-Low Molecular Weight Chitosan Network Hydrogels

“…Effect of PEG on the gel fraction of hydrogel L after being irradiated at 7kGy Figure 4 demonstrates the diffractograms of LMC, PVP, PEG and siries of hydrogel L. The LMC has 2 broad peaks at 2θ = 10º and 20º with the same pattern, where at 2θ = 20º has sharper and more intense peak. This indicates degradation of chitosan by gamma ray does not change the crystallographic orientation of chitosan as semicrystalline polysaccharide (Duy et al 2011). Meanwhile, PVP has double broad diffractions at 2θ = 10° and 22° which indicate the amorphous nature of PVP (Sivaiah et al 2011).…”

Preparation and anatomical distribution study of 67Ga-alginic acid nanoparticles for SPECT purposes in rainbow trout (Oncorhynchus mykiss)

“…Gamma irradiation of natural polysaccharides, such as chitosan, carrageenan and sodium alginate, offers a clean method for the formation of low-molecular weight oligomers. These oligomers have valid applications as antibiotic, antioxidant and plant-growth promoting substances [5,6]. There are a lot of studies on the application of these degraded polysaccharides in different fi elds, such as agriculture [5,7].…”