Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 114, Issue -, Pages 942-949Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2018.03.179
Keywords
Quaternized chitosan; Aminopyridine; Antifungal
Funding
- National Natural Science Foundation of China [41306071]
- Scientific and Technological Innovation Project - Qingdao National Laboratory for Marine Science and Technology [2015ASKJ02]
- Science and Technology Program - Qingdao [17-3-3-60-nsh]
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A novel type of water soluble chitosan derivatives (TQCSPX) were synthesized including 3-aminopyridine (TQCSPI) and 3-Amino-4-methylpyridine (TQCSP2). The theoretical structures of TQCSPX were calculated by Gaussian 09 and confirmed by FT-IR, H-1 NMR, C-13 NMR, elemental analysis and XRD. The antifungal properties of TQCSPX against Phytophthora capsici (P. capsici), Rhizoctonia solani (R. solani), Fusarium oxysporum (F. oxysporum) and Fusarium solani (F. solani) were evaluated at concentrations ranging from 0.2 mg/mL to 0.8 mg/mL Antifungal results indicated that the derivatives have significantly enhanced antifungal activity after quaternized compared with the original chitosan (CS). Moreover, TQCSPI inhibited the growth of P. capsici with inhibitory indices of 91.94% at 0.8 mg/mL The experimental results demonstrated that the increasing number of the positive charge would improve the antifungal efficiency of chitosan, which may provide a novel direction for the development of fungicides. (C) 2018 Elsevier B.V. All rights reserved.
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