N-carboxymethylchitosan inhibition of aflatoxin production: Role of zinc

Cuero, R. G.; Osuji, Godson O.; Washington, A.

doi:10.1007/bf01030998

Cited by 203 publications

(101 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The larger number of positive charges may have imparted a net positive charge to the surfaces to keep them in suspension as in microorganisms. Chitosan also acts as a chelating agent that selectively binds trace metals and thereby inhibits the production of toxins and microbial growth (Cuero et al 1991). It also activates several defence processes in the host tissue (El Ghaouth et al 1992), acts as a water-binding agent and inhibits various enzymes.…”

Section: Discussionmentioning

confidence: 99%

Nematicidal activity of a biopolymer chitosan at different molecular weights against root-knot nematode, Meloidogyne incognita

Khalil¹,

Badawy²

2012

Plant Prot. Sci.

View full text Add to dashboard Cite

Khalil M.S., Badawy M.E.I. (2012): Nematicidal activity of a biopolymer chitosan at different molecular weights against root-knot nematode, Meloidogyne incognita. Plant Protect. Sci., 48: 170-178.The nematicidal activity of four molecular weights (2.27 × 10 5 , 3.60 × 10 5 , 5.97 × 10 5 , and 9.47 × 10 5 g/mol) of a biopolymer chitosan was assayed against the root-knot nematode, Meloidogyne incognita, in vitro and in pot experiments. In laboratory assays, the nematode mortality was significantly influenced by exposure times and chitosan molecular weight. Low molecular weight chitosan (2.27 × 10 5 g/mol) was the most effective in killing the nematode with EC 50 of 283.47 and 124.90 mg/l after 24 and 48 h of treatment, respectively. In a greenhouse bioassay, all the compounds mixed in soil at one-and five-fold concentrations of the LC 50 value significantly reduced population, egg mass, and root galling of tomato seedlings compared with the untreated control. In general, the nematicidal activity of these compounds was increased dramatically with a decrease in the molecular weight. The results suggest that the chitosan at low molecular weight may serve as a natural nematicide.

show abstract

Section: Discussionmentioning

confidence: 99%

Nematicidal activity of a biopolymer chitosan at different molecular weights against root-knot nematode, Meloidogyne incognita

Khalil¹,

Badawy²

2012

Plant Prot. Sci.

View full text Add to dashboard Cite

show abstract

“…The prevailing contention is that chitosan acts essentially as an outer membrane disruptor rather than as a penetrating material [16,34] . The third mechanism is the chelation of metals, suppression of spore elements and binding to essential nutrients to microbial growth [37,38] . It is well known that chitosan has excellent metal-binding capacities where the amine groups in the chitosan molecules are responsible for the uptake of metal cations by chelation [23] .…”

Section: Influence Of the Degree Of Acetylation And Molecular Weightmentioning

confidence: 99%

A review of the antimicrobial activity of chitosan

2009

View full text Add to dashboard Cite

Chitosan, a versatile hydrophilic polysaccharide derived from chitin, has a broad antimicrobial spectrum to which gram-negative, gram-positive bacteria and fungi are highly susceptible. In the current review, three possible and accepted antimicrobial mechanisms for chitosan are presented and briefly discussed. The activity dependence on polymeric molecular weight (MW) and degree of acetylation (DA) are described. The chitosan minimum inhibitory concentrations (MIC) are summarized according to recent data found in the literature. The potential to improve inhibitory growth of bacteria by using water soluble chitosan derivatives is also discussed. The data indicate that the effectiveness of chitosan varies and is dependent on species of target microorganisms.

show abstract

“…[48][49][50] Besides, chitosan can be a chelating agent to bind metals to inhibit the microbial growth and toxin production. 51 Its antibacterial activity is relevant to the concentration and MW. It has been proposed that the antimicrobial model of chitosan is to attach on the surface of bacteria.…”

Section: Bacteriostatic Testmentioning

confidence: 99%

Preparation and characterization of a novel bacterial cellulose/chitosan bio-hydrogel

Jia

Wang

Huo³

et al. 2017

Nanomaterials and Nanotechnology

View full text Add to dashboard Cite

Composites of chitosan chloride and bacterial cellulose were successfully prepared by in situ method. Composites of bacterial cellulose/chitosan and pristine bacterial cellulose were investigated by means of scanning electron microscope, atomic force microscope, Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray diffraction, and bacteriostatic test. The crystallization of bacterial cellulose was interfered and weakened by the chitosan chloride included in the growth media, resulting in lower crystallinity index and thermal stability. And interaction between two polymers is verified by the thermal gravimetric analysis. The ultrafine nanofibril network structure of bacterial cellulose was retained by the composites, while the diameters were larger and the aperture inside were smaller than those of pristine bacterial cellulose, as shown through scanning electron microscope and atomic force microscope figures. The antimicrobial effects were enhanced by the increasing concentration of chitosan in composites. All the characteristics of the composites provide evidence for the miscibility of chitosan and cellulose. Their biocompatibility is proved through our published data. It is strongly indicated that bacterial cellulose-chitosan nanocomposites have great potential in tissue engineering or pharmaceutical applications in the near future.

show abstract

N-carboxymethylchitosan inhibition of aflatoxin production: Role of zinc

Cited by 203 publications

References 8 publications

Nematicidal activity of a biopolymer chitosan at different molecular weights against root-knot nematode, Meloidogyne incognita

Nematicidal activity of a biopolymer chitosan at different molecular weights against root-knot nematode, Meloidogyne incognita

A review of the antimicrobial activity of chitosan

Preparation and characterization of a novel bacterial cellulose/chitosan bio-hydrogel

Contact Info

Product

Resources

About