Results 261 to 270 of about 71,523 (300)

The preparation and antioxidant activity of the sulfanilamide derivatives of chitosan and chitosan sulfates

Bioorganic & Medicinal Chemistry, 2007
Chitosan (CS) and chitosan sulfates (CSS) with different molecular weight (Mw) were reacted with 4-acetamidobenzene sulfonyl chloride to obtain sulfanilamide derivatives of chitosan and chitosan sulfates (LSACS, HSACS, LSACSS, HSACSS). The preparation conditions such as different reaction time, temperature, solvent, and the molar ratio of reaction ...
Zhimei, Zhong, Xia, Ji, Ronge, Xing, Song, Liu, Zhanyong, Guo, Xiaolin, Chen, Pengcheng, Li   +6 more
openaire   +2 more sources

Antimicrobial Chitosan and Chitosan Derivatives: A Review of the Structure–Activity Relationship

Biomacromolecules, 2017
This review gives an updated overview of the current state-of-the-art for antimicrobial chitosan and chitosan derivatives and the effects of structural modifications on activity and toxicity. The various synthetic routes introduced for chemical modification of chitosan are discussed, and the most common functional groups are highlighted.
Priyanka Sahariah, Már Másson
openaire   +2 more sources

Mercury sorption on a thiocarbamoyl derivative of chitosan

Journal of Hazardous Materials, 2009
The grafting of thiourea on chitosan backbone allows synthesizing a thiocarbamoyl derivative that was very efficient for mercury sorption in acidic solutions. Though the sorption capacity is not increased compared to raw chitosan in near neutral solutions, this modification allowed maintaining high sorption capacity (close to 2.3 mmol Hg g(-1)) at pH 2.
K Campos, Gavilan, A V, Pestov, H Maldonado, Garcia, Y, Yatluk, Jean, Roussy, E, Guibal   +5 more
openaire   +2 more sources

Anticancer Effects of Chitin and Chitosan Derivatives

2014
Despite considerable progress in medical research, cancer is still one of the high-ranking causes of death in the world. It is the second most common cause of death due to disease after heart disease, and according to World Health Organization it will be the cause of death for more than 10 million people in 2020; therefore, one of the main research ...
Mustafa Zafer, Karagozlu, Se-Kwon, Kim
openaire   +2 more sources

Chitosan Derivatives as Biosorbents for Basic Dyes

Langmuir, 2007
The scope of this study was to prepare and evaluate chitosan derivatives as biosorbents for basic dyes. This was achieved by grafting poly (acrylic acid) and poly (acrylamide) through persulfate induced free radical initiated polymerization processes and covalent cross-linking of the prepared materials.
Nikolaos K, Lazaridis, George Z, Kyzas, Alexandros A, Vassiliou, Dimitrios N, Bikiaris   +3 more
openaire   +2 more sources

Chitosan and its derivatives for gene delivery

International Journal of Biological Macromolecules, 2011
Gene delivery can particularly be used for the treatment of diseases by the insertion of genetic materials (DNA and RNA) into mammalian cells either to express new proteins or to prevent the expression of existing proteins. Chitosan, a natural polymer is nontoxic, biocompatible, and biodegradable and it is used as a support material for gene delivery ...
N, Saranya, A, Moorthi, S, Saravanan, M Pandima, Devi, N, Selvamurugan   +4 more
openaire   +2 more sources

Reactions of chitosan: 4. Preparation of organosoluble derivatives of chitosan

International Journal of Biological Macromolecules, 1982
Abstract Fully subtituted di- O -acetyl- N -acetylchitosan (chitin diacetate) has been prepared by a route in which the hydroxyl groups are acetylated prior to N -acetylation. This overcomes the previously reported intramolecular steric hindrance to esterification caused by the N -acetamido group.
Graham K. Moore, George A.F. Roberts
openaire   +1 more source

Antioxidant Effects of Chitin, Chitosan, and Their Derivatives

2014
Chitin, chitosan, and their derivatives are considered to promote diverse activities, including antioxidant, antihypertensive, anti-inflammatory, anticoagulant, antitumor and anticancer, antimicrobial, hypocholesterolemic, and antidiabetic effects, one of the most crucial of which is the antioxidant effect.
Dai-Hung, Ngo, Se-Kwon, Kim
openaire   +2 more sources

Derivatives of Chitin and Chitosan

1992
Compared with the extensive research that has been carried out on both the production and the properties of cellulose nitrate,1 because of its commercial importance as an explosive and as a plastic, very little research has been carried out on the nitration of chitin and chitosan.
openaire   +1 more source

Chitosan derivatives

2022
Saviour A. Umoren, Moses M. Solomon, Viswanathan S. Saji   +2 more
openaire   +1 more source