Polymeric materials with antimicrobial activity

Cheese whey management: a review.

Recent years have witnessed great developments in biobased polymer packaging films for the serious environmental problems caused by the petroleum-based nonbiodegradable packaging materials. Chitosan is one of the most abundant biopolymers after cellulose. Chitosan-based materials have been widely applied in various fields for their biological and physical properties of biocompatibility, biodegradability, antimicrobial ability, and easy film forming ability. Different chitosan-based films have been fabricated and applied in the field of food packaging. Most of the review papers related to chitosan-based films are focusing on antibacterial food packaging films. Along with the advances in the nanotechnology and polymer science, numerous strategies, for instance direct casting, coating, dipping, layer-by-layer assembly, and extrusion, have been employed to prepare chitosan-based films with multiple functionalities. The emerging food packaging applications of chitosan-based films as antibacterial films, barrie...

Emerging Chitosan-Based Films for Food Packaging Applications

Pharmaceutical applications of chitosan

Background: Demand for healthy and safe food with minimal use of synthetic inputs (including synthetic preservatives) is increasing rapidly. Plastic polymers being hazardous to the environment, sig ...

Chitosan based nanocomposite films and coatings: Emerging antimicrobial food packaging alternatives

Preparation of chitosan-TiO2 composite film with efficient antimicrobial activities under visible light for food packaging applications.

Using the polyurethane (PU) resin modified by anion surfactant, the hydrophilic polyurethane/titanium dioxide (TiO 2 ) complex film (HPTF) was prepared. The characteristics of the HPTF were described by Fourier-transform infrared spectrometry (FT-IR), ultraviolet–visible spectroscopy (UV–vis) and standard measurements of mechanical properties. Simultaneously, the antimicrobial activities of the HPTF were also studied. The results indicated that, after 8 h, nearly all of the Escherichia coli ( E. coli ) and Candida albicans ( C. albicans ) could be killed under visible light irradiation; the antimicrobial activity was evidently better than pristine polyurethane film. The antimicrobial ratio of the latter was less than 40% under the same conditions. The optimal TiO 2 amount in the HPTF preparation was 0.25 g (TiO 2 )/100 mL (emulsion). The antimicrobial activity of the HPTF under visible light was in accordance with the UV–vis absorption spectra, in which strong absorption extended over the visible light spectra region. The combination of the dodecyl sulfonate group and titanium dioxide with polyurethane was found via FT-IR.

Antimicrobial activities of hydrophilic polyurethane/titanium dioxide complex film under visible light irradiation

A novel chitosan/nano-TiO2 composite emulsion (CTCE) was prepared by inverse suspension technol- ogy, and its multi-function properties were studied. As can be seen from the results, the gauze treated with chitosan/ nano-TiO2 composite emulsion showed excellent antibacterial activities against Escherichia coli, Aspergillus niger and Candida albicans that the bactericidal ratios could reach 99.96%, 100% and 78.3% after 24 h, respectively. At the same time, the chitosan/nano-TiO2 composite emulsion could really kill the bacteria, not just inhibit its growth, and the bac- tericidal ratio for E. coli could reach 70.3% after 1 h. The bactericidal ratio for E. coli reached 98.8% at 27 o C com- pared with 58.7% at 18 o C after 8 h due to the activity of bacteria being weakened at low temperature. Furthermore, the antibacterial ability of antibacterial gauze was hardly influenced with the increase of storage time, which could be reused for up to 8 times without loss of antibacterial ability.

https://cheric.org/PDF/KJChE/KC25/KC25-6-1434.pdf

Antibacterial and anti-mildew behavior of chitosan/nano-TiO2 composite emulsion

The behavior of active bactericidal and antifungal coating under visible light irradiation

The invention relates to a preparation method of an antifogging self-cleaning antibacterial mildewproof spraying agent. Under the stirring condition, nanometer titanium dioxide is added and dispersed uniformly. Then, hydrophilic medium is added for the surface modification of the nanometer titanium dioxide. Resin latex is added slowly. Then, accessory ingredient and silane coupling agent are added for the suspension mixing. The antifogging self-cleaning antibacterial mildewproof spraying agent is obtained. The hydrophilic medium is added for the surface modification of the nanometer titanium dioxide and the proper resin latex is selected to be matched with the mildewproof agent. Thus, the spraying agent prepared through the invention is provided with good antifogging self-cleaning performance and antibacterial mildewproof performance, can be widely applied to object surfaces of internal and external walls, glass, emtal material, ceramics, sanitations, furniture, and the like, and has the advantages of broad spectrum antibacterial performance, simple and easy preparation method and lower production cost than similar products.

Xiaodong Zhang

Papers

Preparation of chitosan-TiO2 composite film with efficient antimicrobial activities under visible light for food packaging applications.

Antimicrobial activities of hydrophilic polyurethane/titanium dioxide complex film under visible light irradiation

Antibacterial and anti-mildew behavior of chitosan/nano-TiO2 composite emulsion

The behavior of active bactericidal and antifungal coating under visible light irradiation

Method for preparing antifogging self-cleaning antimicrobial mildew-proof spraying agent