ESR study on carboxymethyl chitosan radicals in an aqueous solution

Saiki, Seiichi; Nagasawa, Naotsugu; Hiroki, Akihiro; Morishita, Norio; Tamada, Masao; Muroya, Yusa; Kudo, Hiroyuki; Katsumura, Yosuke

doi:10.1016/j.radphyschem.2009.08.043

Cited by 15 publications

(6 citation statements)

References 13 publications

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“…Irradiation with CMC that has a high degree of substitution yielded the high gel fraction at the same dose [11,12]. Saiki et al have reported that CMC polymer radicals produced by the irradiation were mainly in a methyl of the carboxymethyl group, where the crosslinking structure was formed [13]. The CMC and CMS used in the present study had degrees of substitution of 1.34 and 0.12, respectively.…”

Section: Biodegradabilitymentioning

confidence: 60%

Biodegradability of Blend Hydrogels Based on Carboxymethyl Cellulose and Carboxymethyl Starch

Hiroki

Hong²,

Nagasawa

et al. 2011

Trans. Mat. Res. Soc. Japan

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Biodegradable blend hydrogels based on carboxymethyl cellulose (CMC) and carboxymethyl starch (CMS) were prepared by the radiation-induced crosslinking. Properties of the crosslinked CMC/CMS blend hydrogels such as gel fraction, degree of swelling (Sw), gel strength, and biodegradability were investigated. The Sw of the CMC/CMS blend hydrogels were in the range of 10 to 800, which depended on the dose as well as on the CMC/CMS ratio. The gel fraction and the Sw of the CMC/CMS blend hydrogels obtained at the same dose decreased and increased, respectively, with increasing CMS content. The biodegradability of the CMC/CMS blend hydrogels was controlled by adjusting the CMC/CMS ratio, resulting in the biodegradation ratio in the range of 5% to 20% after 30 days in controlled compost.

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Section: Biodegradabilitymentioning

confidence: 60%

Biodegradability of Blend Hydrogels Based on Carboxymethyl Cellulose and Carboxymethyl Starch

Hiroki

Hong²,

Nagasawa

et al. 2011

Trans. Mat. Res. Soc. Japan

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“…However, the diversity and complexity of the chitosan conjugate structure also put forward higher requirements for its structural characterization. In addition to conventional NMR, IR, and other methods, electron paramagnetic resonance (EPR) has also been demonstrated to play a key role in studying the mechanism of free radical grafting reaction of chitosan [59][60][61][62]. This is because EPR spectroscopy is useful for elucidating the species of free radicals present in a reaction and distinguishing carbon, nitrogen or oxygen-based free radicals.…”

Section: Free Radical-induced Conjugationmentioning

confidence: 99%

Antimicrobial Chitosan Conjugates: Current Synthetic Strategies and Potential Applications

Qin

2020

IJMS

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As a natural polysaccharide, chitosan possesses good biocompatibility, biodegradability and biosafety. Its hydroxyl and amino groups make it an ideal carrier material in the construction of polymer-drug conjugates. In recent years, various synthetic strategies have been used to couple chitosan with active substances to obtain conjugates with diverse structures and unique functions. In particular, chitosan conjugates with antimicrobial activity have shown great application prospects in the fields of medicine, food, and agriculture in recent years. Hence, we will place substantial emphasis on the synthetic approaches for preparing chitosan conjugates and their antimicrobial applications, which are not well summarized. Meanwhile, the challenges, limitations, and prospects of antimicrobial chitosan conjugates are described and discussed.

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“…33 Both marine-derived polysaccharides demonstrated to have unique physicochemical properties and a vast potential for a wide variety of areas, including in pharmaceutical and biomedical fields. 34,35 The focus of this review is on the marine-derived polysaccharide chitosan, addressing the structure and properties, as well as the synthetic approaches for its preparation and chemical modification to obtain derivatives and conjugates. A recent update of the biological activities and applications in different research fields is presented highlighting current trends.…”

Section: Introductionmentioning

confidence: 99%

“…Over the last years, this class of compounds has attracted great attention due to their wide variety of biological activities, such as antitumor, antioxidant, anti‐inflammatory, and anticoagulant 5–8 . The biological activities are greatly affected by the average molecular weight, monosaccharide composition, and type of glycosidic and sulfate contents of the compounds and may end up influencing the pharmaceutical and medicinal applications 9–11 …”

Section: Introductionmentioning

confidence: 99%

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Molecular modifications, biological activities, and applications of chitosan and derivatives: A recent update

2022

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Polysaccharides arouse great interest due to their structure and unique properties, such as biocompatibility, biodegradability, and absence of toxicity. Polysaccharides from marine sources are particularly useful due to the wide variety of applications and biological activities. Chitosan, a deacetylated derivative of chitin, is an example of an interesting bioactive marine-derived polysaccharide. Moreover, a wide variety of chemical modifications and conjugation of chitosan with other bioactive molecules are responsible for improvements in physicochemical properties and biological activities, expanding the range of applications. An overview of the synthetic approaches for preparing chitosan, chitosan derivatives, and conjugates is described and discussed. A recent update of the biological activities and applications in different research fields, mainly focused on the last 5 years, is presented, highlighting current trends.

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ESR study on carboxymethyl chitosan radicals in an aqueous solution

Cited by 15 publications

References 13 publications

Biodegradability of Blend Hydrogels Based on Carboxymethyl Cellulose and Carboxymethyl Starch

Biodegradability of Blend Hydrogels Based on Carboxymethyl Cellulose and Carboxymethyl Starch

Antimicrobial Chitosan Conjugates: Current Synthetic Strategies and Potential Applications

Molecular modifications, biological activities, and applications of chitosan and derivatives: A recent update

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