Utilization in situ of biodegradable films produced with chitosan, and functionalized with ε-poly-l-lysine: an effective approach for super antibacterial application

2022 ◽  
Author(s):  
Zahra Mousavi ◽  
Sedigheh Babaei ◽  
Mahmood Naseri ◽  
Seyed Mohammad Hashem Hosseini ◽  
Seyed Shahram Shekarforoush
Keyword(s):  
Biodegradable Films

scholarly journals Hydrophobic Starch-Based Films Using Potato Washing Slurries and Spent Frying Oil

Foods ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 2897
Author(s):  
Sílvia Petronilho ◽  
André Oliveira ◽  
M. Rosário Domingues ◽  
Fernando M. Nunes ◽  
Manuel A. Coimbra ◽  
...  
Keyword(s):  
Potato Starch ◽  
Contact Angles ◽  
Single Step ◽  
Frying Oil ◽  
Biodegradable Films ◽  
Water Contact ◽  
Alkaline Catalyst ◽  
Application Range ◽  
Structural Differences

Starch is a promising candidate for preparing biodegradable films with useful gas barriers and thermoplastic capabilities. However, these materials are hydrophilic and brittle, thus limiting their application range. To overcome these drawbacks, it has been hypothesized that starch can be hydrophobized and plasticized during the starch-based film production using a single-step approach and following transesterification principles. In this work, KOH powder and spent frying oil (SFO) were used as an alkaline catalyst and a source for triacylglycerides, respectively, to promote the modification of starch. Different ratios of SFO (w/w related to the dried starch weight) were tested. When compared to the neat films (without a catalyst and SFO), the incorporation of at least 15% SFO/KOH gave rise to transparent, hydrophobic (water contact angles of ca. 90°), stretchable (ca. 20×), elastic (ca. 5×), and water tolerant starch-based films, contrary to the films produced without the catalyst. ATR-FTIR and 1H NMR revealed structural differences among the produced films, suggesting that starch was modified with the SFO-derived fatty acids. Therefore, adding KOH during the potato starch/spent frying oil-based film’s production was determined to be a promising in situ strategy to develop starch-based materials with improved hydrophobicity and flexibility, while valorizing the potato chip industry’s byproducts.

scholarly journals In Situ Grafting of Silica Nanoparticle Precursors with Covalently Attached Bioactive Agents to Form PVA-Based Materials for Sustainable Active Packaging

Polymers ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2889
Author(s):  
Miri Klein ◽  
Anat Molad Filossof ◽  
Idan Ashur ◽  
Sefi Vernick ◽  
Michal Natan-Warhaftig ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Silica Nanoparticle ◽  
Listeria Innocua ◽  
Packaging Materials ◽  
Biodegradable Films ◽  
Log Reduction ◽  
High Antioxidant Activity ◽  
Bioactive Agents ◽  
Antibacterial And Antioxidant Activity

Sustainable antibacterial–antioxidant films were prepared using in situ graftings of silica nanoparticle (SNP) precursors with covalently attached bioactive agents benzoic acid (ba) or curcumin (cur) on polyvinyl alcohol (PVA). The modified PVA-SNP, PVA-SNP-ba and PVA-SNP-cur films were characterized using spectroscopic, physicochemical and microscopic methods. The prepared films showed excellent antibacterial and antioxidant activity, and increased hydrophobicity providing protection from undesired moisture. The PVA-SNP-ba films completely prevented the growth of the foodborne human pathogen Listeria innocua, whereas PVA-SNP-cur resulted in a 2.5 log reduction of this bacteria. The PVA-SNP-cur and PVA-SNP-ba films showed high antioxidant activity of 15.9 and 14.7 Mm/g TEAC, respectively. The described approach can serve as a generic platform for the formation of PVA-based packaging materials with tailor-made activity tuned by active substituents on silica precursors. Application of such biodegradable films bearing safe bioactive agents can be particularly valuable for advanced sustainable packaging materials in food and medicine.

Application in situ of biodegradable films produced with starch, citric pectin and functionalized with feijoa (Acca sellowiana (Berg) Burret) extracts: An effective proposal for food conservation

2021 ◽  
Author(s):  
William Gustavo Sganzerla ◽  
Cleonice Gonçalves da Rosa ◽  
Aline Priscilla Gomes da Silva ◽  
Jocleita Peruzzo Ferrareze ◽  
Mônia Stremel Azevedo ◽  
...  
Keyword(s):  
Biodegradable Films ◽  
Acca Sellowiana

Silica in situ enhanced PVA/chitosan biodegradable films for food packages

2018 ◽  
Vol 184 ◽  
pp. 214-220 ◽  
Author(s):  
Zhen Yu ◽  
Baoqiang Li ◽  
Jiayu Chu ◽  
Peifeng Zhang
Keyword(s):  
Biodegradable Films ◽  
Food Packages

In situ generated silica reinforced polyvinyl alcohol/liquefied chitin biodegradable films for food packaging

2020 ◽  
Vol 238 ◽  
pp. 116182 ◽  
Author(s):  
Jie Zhang ◽  
Wen-Rong Xu ◽  
Yu-Cang Zhang ◽  
Xu-Dong Han ◽  
Chen Chen ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Food Packaging ◽  
Biodegradable Films

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

Sign in / Sign up

Export Citation Format

Share Document