Synthesis and antimicrobial activity of the Schiff base from chitosan and citral

Jin, Xiaoxiao; Wang, Jiangtao; Bai, Jie

doi:10.1016/j.carres.2009.01.022

Cited by 145 publications

(60 citation statements)

References 18 publications

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“…The IR spectra of Schiff bases of zeinbased films (Fig. 1c, d, e) show a strong absorption band at 1643.2, 1647.1 and 1596.9 cm −1 attributed to C0N vibrations characteristic of imines for CA, BA or DMABA Schiff bases, respectively (Colthup et al 1990;Guinesi and Cavalheiro 2006;Jin et al 2009) which is not observed in pure zein and zein cross-linked with PEG. On the other hand, characteristic bands of the utilized free aldehydes (1678, 1703 and 1694 cm −1 for CA, BA or DMABA, respectively) didn't appeared.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, characterization and antibacterial activity of biodegradable films prepared from Schiff bases of zein

Soliman¹,

Khalil

Deraz

et al. 2012

J Food Sci Technol

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Pure zein is known to be very hydrophobic, but is still inappropriate for coating and film applications because of their brittle nature. In an attempt to improve the flexibility and the antimicrobial activity of these coatings and films, Chemical modification of zein through forming Schiff bases with different phenolic aldhydes was tried. Influence of this modifications on mechanical, topographical, wetting properties and antimicrobial activity of zein films were evaluated. The chemical structure of the Schiff bases films were characterized by ATR-FTIR spectroscopy. The results indicate an improvement in mechanical properties with chemically modification of zein to form Schiff bases leading to a reduction in the elastic modulus. An increase in the elongation at break has been observed, but with slight influence on tensile strength. Plasticized zein films have similar initial contact angle (∼40°). An increase in reaction temperature and time increases film's affinity towards water. As shown by contact angle measurements, a noticeable relation was found between film composition and the hydrophilicity. Surface topography also varied by forming Schiff bases, becoming rougher than zein-based films. The antibacterial activities of zein and Schiff bases of zein-based films were investigated against grampositive bacteria (Listeria innocua, Listeria monocytogenes, Bacillus cereus and Clostridium sporogenes) and gramnegative bacteria (Escherichia coli, Yersinia enterocolitica and Salmonella enterica). It was found that the antibacterial activity of the Schiff bases-based films was more effective than that of zein-based films.

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Section: Resultsmentioning

confidence: 99%

Synthesis, characterization and antibacterial activity of biodegradable films prepared from Schiff bases of zein

Soliman¹,

Khalil

Deraz

et al. 2012

J Food Sci Technol

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“…24,25 For these reasons, chitosan has received great attention in the fields of medicine, food, chemicals, pharmaceuticals, and agriculture. [26][27][28][29] Although several independent studies have shown applications of nanoparticles in various fields, studies describing their impact on counteracting bacterial infections are limited. In this study, chitosan-stabilized AgNPs (CS-AgNPs) were synthesized, characterized by transmission electron microscopy (TEM) and dynamic light scattering, and tested for antibacterial activity against a panel of human pathogens such as Staphylococcus aureus, Pseudomonas aeruginosa, Salmonella typhi, and Mycobacterium smegmatis, representing Gram-positive, Gram-negative, and acid-fast bacteria.…”

Section: Introductionmentioning

confidence: 99%

Toxicity and antibacterial assessment of chitosan-coated silver nanoparticles on human pathogens and macrophage cells

Jena¹,

Mohanty²,

Mallick³

et al. 2012

IJN

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Background: Pathogenic bacteria are able to develop various strategies to counteract the bactericidal action of antibiotics. Silver nanoparticles (AgNPs) have emerged as a potential alternative to conventional antibiotics because of their potent antimicrobial properties. The purpose of this study was to synthesize chitosan-stabilized AgNPs (CS-AgNPs) and test for their cytotoxic, genotoxic, macrophage cell uptake, antibacterial, and antibiofilm activities. Methods: AgNPs were synthesized using chitosan as both a stabilizing and a reducing agent. Antibacterial activity was determined by colony-forming unit assay and scanning electron microscopy. Genotoxic and cytotoxic activity were determined by DNA fragmentation, comet, and MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] assays. Cellular uptake and intracellular antibacterial activity were tested on macrophages. Results: CS-AgNPs exhibited potent antibacterial activity against different human pathogens and also impeded bacterial biofilm formation. Scanning electron microscopy analysis indicated that CS-AgNPs kill bacteria by disrupting the cell membrane. CS-AgNPs showed no significant cytotoxic or DNA damage effect on macrophages at the bactericidal dose. Propidium iodide staining indicated active endocytosis of CS-AgNPs resulting in reduced intracellular bacterial survival in macrophages. Conclusion:The present study concludes that at a specific dose, chitosan-based AgNPs kill bacteria without harming the host cells, thus representing a potential template for the design of antibacterial agents to decrease bacterial colonization and to overcome the problem of drug resistance.

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“…The sonication from ultrasound helped the removal of air bubbles in the bulk of chitosan derivatives and the breakdown of aggregated nanospheres [38]. Satisfactory yields of biaryl product were obtained under both microwave and ultrasound irradiations in the catalysis reaction with 4-bromoacetphnone and phenylboronic acid.…”

Section: Metal Catalystsmentioning

confidence: 99%

Chitosan as a Natural Polymer for Heterogeneous Catalysts Support: A Short Review on Its Applications

2015

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Chitosan, a bio-based polymer which has similar characteristics to those of cellulose, exhibits cationic behavior in acidic solutions and strong affinity for metals ions. Thus, it has received increased attention for the preparation of heterogeneous catalysts. Recent studies demonstrated that chitosan-based catalysts had high sorption capacities, chelating activities, stability and versatility, which could be potentially applied as green reactants in various scientific and engineering applications. This study intends to review the recent development of chitosan-based catalysts, particularly in the aspects of the main mechanisms for preparing the materials and their applications in environmental green chemistry. Studies on the preparation of catalyst nanoparticles/nanospheres supported on chitosan were also reviewed.

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Synthesis and antimicrobial activity of the Schiff base from chitosan and citral

Cited by 145 publications

References 18 publications

Synthesis, characterization and antibacterial activity of biodegradable films prepared from Schiff bases of zein

Synthesis, characterization and antibacterial activity of biodegradable films prepared from Schiff bases of zein

Toxicity and antibacterial assessment of chitosan-coated silver nanoparticles on human pathogens and macrophage cells

Chitosan as a Natural Polymer for Heterogeneous Catalysts Support: A Short Review on Its Applications

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