Properties and antimicrobial activities of starch-sodium alginate composite films incorporated with sodium dehydroacetate or rosemary extract

Neem leaves extract was incorporated into the matrix of seaweed biopolymer, and the seaweed-neem biocomposite films were irradiated with various doses of gamma irradiation (0.5, 1.5, 2.5, 3.5, and 4.5 kGy). The physical, barrier, antimicrobial, and mechanical properties of the films were studied. The incorporation of 5% w/w neem leaves extract into a seaweed-based film, and gamma irradiation dose of 2.5 kGy was most effective for improved properties of the film. The results showed that the interfacial interaction of the seaweed-neem improved with physical changes in colour and opacity. The water solubility, moisture content, and water vapour permeability and biodegradability rate of the film reduced. The contact angle values increased, which was interpreted as improved hydrophobicity. The tensile strength and modulus of the films increased, while the elongation of the composite films decreased compared to the control film. The film’s antimicrobial activities against bacteria were improved. Thus, neem leaves extract in combination with the application of gamma irradiation enhanced the performance properties of the film that has potential as packaging material.

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Fluorescent and Mechanical Properties of Silicon Quantum Dots Modified Sodium Alginate-Carboxymethylcellulose Sodium Nanocomposite Bio-Polymer Films

Polymers ◽

10.3390/polym11091476 ◽

2019 ◽

Vol 11 (9) ◽

pp. 1476 ◽

Cited By ~ 1

Author(s):

Ji ◽

Zhang ◽

Quan ◽

Huang ◽

...

Keyword(s):

Quantum Dots ◽

Sodium Alginate ◽

Polymer Films ◽

Composite Films ◽

Excitation Wavelength ◽

Hydrothermal Route ◽

Silicon Quantum Dots ◽

One Pot ◽

Bright Blue Fluorescence ◽

Bright Blue

Highly luminescent silicon quantum dots (SiQDs) were prepared via one-pot hydrothermal route. Furthermore, the optimal synthetic conditions, dependence of the emission spectrum on the excitation wavelength and fluorescent stability of SiQDs were investigated by fluorescence spectroscopy. SiQDs exhibited bright blue fluorescence, and photoluminescence (PL) lifetime is 10.8 ns when excited at 325 nm. The small-sized SiQDs (~3.3 nm) possessed uniform particle size, crystal lattice spacing of 0.31 nm and silicon (111), (220) crystal planes. Luminescent SiQDs/sodium alginate (SA)-carboxymethylcellulose sodium (CMC) nanocomposite bio-polymer films were successfully fabricated by incorporating SiQDs into the SA-CMC matrix. Meanwhile, SiQDs not only impart strong fluorescence to the polymer, but also make the composite films have favorable toughness.

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Development of silver sulfadiazine loaded bacterial cellulose/sodium alginate composite films with enhanced antibacterial property

Carbohydrate Polymers ◽

10.1016/j.carbpol.2015.06.057 ◽

2015 ◽

Vol 132 ◽

pp. 351-358 ◽

Cited By ~ 69

Author(s):

Wei Shao ◽

Hui Liu ◽

Xiufeng Liu ◽

Shuxia Wang ◽

Jimin Wu ◽

...

Keyword(s):

Bacterial Cellulose ◽

Sodium Alginate ◽

Antibacterial Property ◽

Composite Films ◽

Silver Sulfadiazine

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Effect of Sodium Alginate on the Properties of Composite Protein Films

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.541-542.49 ◽

2014 ◽

Vol 541-542 ◽

pp. 49-56 ◽

Cited By ~ 3

Author(s):

Qiao Lei ◽

Zhi Ying Huang ◽

Jia Zhen Pan ◽

Jian Qiang Bao ◽

Qian Nan Xun

Keyword(s):

Sodium Alginate ◽

Water Solubility ◽

Uniform Design ◽

Composite Films ◽

Barrier Properties ◽

Protein Films ◽

Film Forming ◽

Mean Diameter ◽

Electron Microscope Analysis ◽

Design Experiments

Effects of sodium alginate on properties of WPI-NaCas composite films optimized by previous uniform design experiments were investigated. Films were prepared with different concentrations (1%, 2%, 3%) and ratios (1:0, 5:1, 3:1, 1:1, 1:3, 1:5, 0:1, ratio of composite protein solution to sodium alginate solution) of sodium alginate additions. Results suggested increases in water solubility of films and middle diameter, volume-length mean diameter and area-length mean diameter of film-forming solutions. Addition of sodium alginate decreased the gas and water vapor barrier properties of composite films, however, their mechanical properties could be improved by proper usage. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope analysis indicated that protein and sodium alginate presented well interaction and compatibility.

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