scholarly journals Facile and Green Preparation of Pectin/Cellulose Composite Films with Enhanced Antibacterial and Antioxidant Behaviors

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 57 ◽  
Author(s):  
Shan Ye ◽  
Zhongjie Zhu ◽  
Yanyi Wen ◽  
Chen Su ◽  
Lei Jiang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Food Packaging ◽  
Composite Films ◽  
Radical Scavenging ◽  
Antibacterial Activities ◽  
Tea Polyphenols ◽  
Dpph Radical ◽  
Tea Polyphenol ◽  
And Staphylococcus Aureus ◽  
Cellulose Composite

Novel bioactive films based on pectin and cellulose (PC) with different loadings of tea polyphenols and cinnamaldehyde were successfully prepared. A thermal stability was tested, and the results showed that the thermal stability decreased slightly after loading with cinnamaldehyde and tea polyphenols, compared to PC films. The antimicrobial and antioxidant capacities were also investigated. Results showed that PC composite films had good DPPH radical and hydroxyl radical scavenging activities and excellent antibacterial activities against Escherichia coli, Candida albicans and Staphylococcus aureus. Based on the results, the great antioxidant and antibacterial activities of the tea polyphenol and cinnamaldehyde loaded PC films make them suitable for food packaging and preservation.

scholarly journals Synthesis of antioxidative anthraquinones as potential anticancer agents

BIBECHANA ◽  
2021 ◽  
Vol 18 (2) ◽  
pp. 143-153
Author(s):  
Richa K. Gupta ◽  
Ganesh M. S. Thakuri ◽  
Gan B Bajracharya ◽  
Ram Narayan Jha
Keyword(s):  
Antibacterial Activity ◽  
Bacillus Subtilis ◽  
Anticancer Agents ◽  
Radical Scavenging ◽  
Antibacterial Activities ◽  
Dpph Radical ◽  
Radical Scavenging Capacity ◽  
Scavenging Capacity ◽  
Dpph Radical Scavenging

Antioxidant and antibacterial activities of natural anthraquinones namely chrysophanol (1) and emodin (2), and synthesized anthraquinones viz. 2-methylanthraquinone (3), anthraquinone (4), 2-bromoanthraquinone (5), rubiadin (6), chrysophanol diacetate (7), rubiadin diacetate (8) and 1,8-dimethoxy-3-methylanthraquinone (9) were investigated. Anthraquinones 9, 3, 6, 5 and 2 exhibited a high DPPH• radical scavenging capacity (IC50 = <500 μg/mL) showing their therapeutic potentiality for the treatment of cancers. These anthraquinones 1-9 have also displayed a weak to moderate antibacterial activity against Bacillus subtilis. Chrysophanol diacetate (7) including emodin (2) have been appeared as the valuable antibacterials. BIBECHANA 18 (2) (2021) 143-153

Mechanical and antibacterial properties of ZnO/chitosan bio-composite films

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ayse Kalemtas ◽  
Hasan B. Kocer ◽  
Ahmet Aydin ◽  
Pinar Terzioglu ◽  
Gulsum Aydin
Keyword(s):  
Particle Size ◽  
Food Packaging ◽  
Mechanical Test ◽  
Composite Films ◽  
Antibacterial Properties ◽  
Chitosan Film ◽  
Antibacterial Activities ◽  
Diffusion Method ◽  
Zno Powders ◽  
Solution Casting Method

Abstract In the current study, ZnO/chitosan bio-composite films were produced via solution-casting method. Two different ZnO powders, micrometer (d50 ≅ 1.5 μm) and nanometer sized (d50 ≅ 100 nm), were used to investigate the effect of ZnO particle size and concentration (0, 2, and 8% w/w of chitosan) on the mechanical and antibacterial properties of the ZnO/chitosan bio-composite films. The incorporation of the ZnO powders into the chitosan film resulted in an increase in the tensile strength (TS) and a decrease in the elongation at break (EB) values. Mechanical test results revealed that TS and EB properties were considerably affected (p < 0.05) by the concentration and particle size of the ZnO reinforcement. Disc diffusion method demonstrated good antibacterial activities of bio-composite films containing high amount of ZnO (8% w/w of chitosan) against Escherichia coli, Staphylococcus aureus, Klebsiella pneumoniae, and Bacillus subtilis. The growth-limiting effect of the films was more pronounced for S. aureus and K. pneumoniae. Due to enhanced TS and imparted antibacterial activity of the produced ZnO/chitosan bio-composite films, these materials are promising candidates for applications such as food packaging, wound dressing, and antibacterial coatings for various surfaces.

scholarly journals Antioxidant and Antimicrobial Effects of the Mangrove Tree Heritiera fomes

2009 ◽  
Vol 4 (3) ◽  
pp. 1934578X0900400 ◽  
Author(s):  
Helle Wangensteen ◽  
Huong Cam Thi Dang ◽  
Shaikh Jamal Uddin ◽  
Mahiuddin Alamgir ◽  
Karl Egil Malterud
Keyword(s):  
Radical Scavenging ◽  
Stem Bark ◽  
Antibacterial Activities ◽  
Degree Of Polymerization ◽  
Dpph Radical ◽  
Etoh Extract ◽  
Mangrove Tree ◽  
Heritiera Fomes ◽  
Dpph Radical Scavenging ◽  
Sundarbans Mangrove

Heritiera fomes is a mangrove tree which is widely distributed in the Sundarbans mangrove forest, Bangladesh. In this study, the EtOH extract of stem bark from H. fomes was shown to be rich in procyanidins. Trimeric, pentameric and hexameric procyanidins were identified in addition to highly polymeric material (average degree of polymerization 18-24). Bioactivity studies showed high DPPH radical scavenging and 15-lipoxygenase (15-LO) inhibiting activities of the bark extracts (EC50 = 19.4 ± 1.7 and IC50 = 22 ± 1 μg/mL, respectively) which could be ascribed to its high content of procyanidins. The procyanidins were also assayed as DPPH scavengers and 15-LO inhibitors, with EC50 and IC50 values in the range of 8-15 and 10-15 μg/mL, respectively. The bark extracts showed antibacterial activities against K. rhizophilia, S. aureus, B. subtilis and P. aeruginosa, as well. No toxicity was observed in the brine shrimp assay.

scholarly journals Hybrid Biocomposites Based on Poly(Lactic Acid) and Silica Aerogel for Food Packaging Applications

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4910 ◽  
Author(s):  
Alejandro Aragón-Gutierrez ◽  
Marina P. Arrieta ◽  
Mar López-González ◽  
Marta Fernández-García ◽  
Daniel López
Keyword(s):  
Thermal Stability ◽  
Lactic Acid ◽  
Silica Aerogel ◽  
Food Packaging ◽  
Mechanical Performance ◽  
Composite Films ◽  
Barrier Properties ◽  
Extrusion Process ◽  
Poly Lactic Acid ◽  
Barrier Performance

Bionanocomposites based on poly (lactic acid) (PLA) and silica aerogel (SiA) were developed by means of melt extrusion process. PLA-SiA composite films were plasticized with 15 wt.% of acetyl (tributyl citrate) (ATBC) to facilitate the PLA processability as well as to attain flexible polymeric formulations for films for food packaging purposes. Meanwhile, SiA was added in four different proportions (0.5, 1, 3 and 5 wt.%) to evaluate the ability of SiA to improve the thermal, mechanical, and barrier performance of the bionanocomposites. The mechanical performance, thermal stability as well as the barrier properties against different gases (carbon dioxide, nitrogen, and oxygen) of the bionanocomposites were evaluated. It was observed that the addition of 3 wt.% of SiA to the plasticized PLA-ATBC matrix showed simultaneously an improvement on the thermal stability as well as the mechanical and barrier performance of films. Finally, PLA-SiA film formulations were disintegrated in compost at the lab-scale level. The combination of ATBC and SiA sped up the disintegration of PLA matrix. Thus, the bionanocomposites produced here show great potential as sustainable polymeric formulations with interest in the food packaging sector.

scholarly journals Characterization of Carboxymethyl Cellulose Films Incorporated with Chinese Fir Essential Oil and Their Application to Quality Improvement of Shine Muscat Grape

Coatings ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 97
Author(s):  
Luyu Mei ◽  
Liuxin Shi ◽  
Xiuli Song ◽  
Su Liu ◽  
Qiang Cheng ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Essential Oil ◽  
Carboxymethyl Cellulose ◽  
Food Packaging ◽  
Water Solubility ◽  
Composite Films ◽  
Antimicrobial Properties ◽  
Chinese Fir ◽  
Volatile Components ◽  
Scanning Calorimetry

In this study, carboxymethyl cellulose (CMC) films containing 1%, 2%, and 3% Chinese fir essential oil (CFEO) were prepared. The mechanical, optical, physical, microstructural, thermal stability and antimicrobial properties of the films were studied. A traditional steam distillation method was applied for CFEO extraction, in which 35 volatile components were identified. The research results showed that the CMC film mixed with 1% CFEO had the highest tensile strength (TS) and elongation at break (EB), whereas the flexibility was decreased under higher concentrations of CFEO. However, the film’s degree of transparency under controlled humidity did not decrease with an increase in CFEO concentration; thus, the sensory evaluation was not adversely effect. Furthermore, the thickness and the water solubility (WS) of film increased after the addition of CFEO. The thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) results indicated that the thermal stability of the CMC-CFEO films improved. Moreover, the composite films showed excellent inhibitory effects toward Gram-positive bacterias and Penicillium citrinum. The treatments of grapes with CMC + 1% CFEO resulted in the best properties during storage. CMC-CFEO film can be a candidate for food packaging due to its excellent performances.

scholarly journals PHYTOCHEMICAL SCREENING, ANTIOXIDANT AND ANTIBACTERIAL ACTIVITIES OF MILLINGTONIA HORTENSIS (L)

2017 ◽  
pp. 162-167
Author(s):  
Janaki A. ◽  
Kaleena P. K. ◽  
Elumalai D. ◽  
Hemalatha P. ◽  
Babu M. ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Antibacterial Activities ◽  
Phytochemical Screening ◽  
Dpph Radical ◽  
Dpph Radical Scavenging Activity ◽  
Leaf Extracts ◽  
Micro Organisms ◽  
Dpph Radical Scavenging

Objective: Millingtonia hortensis Linn (Bignoniaceae) is commonly known as cork tree and Akash neem. Aim of studies to determine the antioxidant activity and antibacterial activity.Methods: The antioxidant activity of different solvent extracts were measured by chemical analyses involving the assay of 1,1-diphenyl-2-picryhydrazyl (DPPH) radical scavenging activity and super oxide radical scavenging activity.Results: Phytochemicals (secondary metabolites) screening of methanol, chloroform, ethanol, petroleum ether, aqueous leaf extracts revealed the presence of carbohydrates, tannins, saponins, flavonoids, alkaloids, betacyanins, phenols and coumarins.Conclusion: The presence of these phytochemicals and antioxidant capacity support the use of this plant as an antibacterial agent against the group of micro organisms tested. 

scholarly journals Biodegradable Rice Starch/Carboxymethyl Chitosan Films with Added Propolis Extract for Potential Use as Active Food Packaging

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 954 ◽  
Author(s):  
Rungsiri Suriyatem ◽  
Rafael Auras ◽  
Chitsiri Rachtanapun ◽  
Pornchai Rachtanapun
Keyword(s):  
Thermal Stability ◽  
Food Packaging ◽  
Radical Scavenging ◽  
Antimicrobial Properties ◽  
Carboxymethyl Chitosan ◽  
Rice Starch ◽  
Propolis Extract ◽  
Gram Positive Bacteria ◽  
Active Food Packaging ◽  
Potential Use

Active films from rice starch/carboxymethyl chitosan (RS/CMCh) incorporated with propolis extract (ppl) were developed and characterized. The effect of the ppl content (0–10% w/w based on RS/CMCh) on the developed films’ properties were determined by measuring the optical, mechanical, thermal, swelling, barrier, antimicrobial, and antioxidant attributes. The thermal stability and biodegradability of the films were also investigated. As the ppl content increased, free radical scavenging and a* and b* color values increased, whereas luminosity (L*) and swellability of the films decreased. The active films with 5–10% ppl possessed antimicrobial ability against Gram-positive bacteria (Staphylococcus aureus and Bacillus cereus). The active film with 10% ppl displayed increased flexibility and thermal stability, without a change in oxygen permeability. The results indicated that incorporation of ppl into RS/CMCh film could enhance the films’ antioxidant and antimicrobial properties.

scholarly journals Physicochemical, Antioxidant and Antimicrobial Properties of Electrospun Poly(ε-caprolactone) Films Containing a Solid Dispersion of Sage (Salvia officinalis L.) Extract

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 270 ◽  
Author(s):  
Ana Salević ◽  
Cristina Prieto ◽  
Luis Cabedo ◽  
Viktor Nedović ◽  
Jose Lagaron
Keyword(s):  
Thermal Stability ◽  
Water Vapor ◽  
Tensile Properties ◽  
Solid Dispersion ◽  
Food Packaging ◽  
Radical Scavenging ◽  
Electrospinning Technique ◽  
Water Contact ◽  
Strong Activity ◽  
Active Food Packaging

In this study, novel active films made of poly(ε-caprolactone) (PCL) containing a solid dispersion of sage extract (SE) were developed by means of the electrospinning technique and subsequent annealing treatment. Initially, the antioxidant and antimicrobial potential of SE was confirmed. Thereafter, the effect of SE incorporation at different loading contents (5%, 10%, and 20%) on the physicochemical and functional properties of the films was evaluated. The films were characterized in terms of morphology, transparency, water contact angle, thermal stability, tensile properties, water vapor, and aroma barrier performances, as well as antioxidant and antimicrobial activities. Thin, hydrophobic films with good contact transparency were produced by annealing of the ultrathin electrospun fibers. Interestingly, the effect of SE addition on tensile properties and thermal stability of the films was negligible. In general, the water vapor and aroma permeability of the PCL-based films increased by adding SE to the polymer. Nevertheless, a strong 2,2-diphenyl-1-picrylhydrazyl (DPPH·) free radical scavenging ability, and a strong activity against foodborne pathogens Staphylococcus aureus and Escherichia coli were achieved by SE incorporation into PCL matrix. Overall, the obtained results suggest great potential of the here-developed PCL-based films containing SE in active food packaging applications with the role of preventing oxidation processes and microbial growth.

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