Various properties of PP/EVOH blends applying itaconic acid based compatibilizer according to ethylene content in the EVOH

2021 ◽  
pp. 1-9
Author(s):  
Jung Soo Kim ◽  
Dong Hyun Kim ◽  
Youn Suk Lee
Keyword(s):  
Itaconic Acid ◽  
Ethylene Content

Innovative Adhesive Systems for Dental Giomer Restorations

2018 ◽  
Vol 69 (10) ◽  
Author(s):  
Ioana Hodisan ◽  
Cristina Prejmerean ◽  
Tinca Buruiana ◽  
Doina Prodan ◽  
Loredana Colceriu ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Itaconic Acid ◽  
Adhesive System ◽  
Adhesive Systems ◽  
Substantial Agreement ◽  
Dye Penetration ◽  
Strong Adhesion ◽  
Innovative Materials ◽  
Dental Applications

The aim of this work was to reduce microleakage in giomer restorations by using innovative materials in both adhesive systems and light-cured dental giomer. Two adhesive systems with different primers were investigated. The innovative compounds in the primers were acrylic acid (AA)/itaconic acid (IA) copolymer modified with methacrylic groups and AA/IA/N-acryloyl-L-leucine copolymer grafted with methacrylic groups. In addition, the investigated new giomer G contains a pre-reacted glass based on the latter copolymer. The commercial Beautifil II giomer and the FL-Bond II adhesive system were used for comparison. Microleakage was evaluated by determining the scores and percentages of dye penetration lengths after thermocycling of a series of light-cured dental giomer restorations performed on 42 premolars extracted for orthodontic reasons. A lower microleakage value was recorded for the adhesive system containing the AA/IA/N-acryloyl-L-leucine copolymer grafted with methacrylic groups than for the commercial adhesive, which was in substantial agreement with SEM and AFM investigations. In this case, remarkable dentin sealing and a strong adhesion at the giomer restoration�tooth interface was observed, and the innovative adhesive was proven to be promising for dental applications.

Optimization Strategies for Microbial Itaconic Acid Biosynthesis

2017 ◽  
Vol 6 (3) ◽  
Author(s):  
Laura van der Straat ◽  
Leo H. de Graaff
Keyword(s):  
Itaconic Acid ◽  
Acid Biosynthesis

scholarly journals Tracking Hydroplasticization by DSC: Movement of Water Domains Bound to Poly(Meth)Acrylates during Latex Film Formation

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2500
Author(s):  
Sebastian M. Dron ◽  
Maria Paulis
Keyword(s):  
Itaconic Acid ◽  
Water Resistance ◽  
Film Formation ◽  
Latex Film ◽  
Water Molecules ◽  
Acrylate Copolymer ◽  
Volatile Organic ◽  
Minimum Film Formation Temperature ◽  
Latex Film Formation ◽  
Formation Step

The film formation step of latexes constitutes one of the challenges of these environmentally friendly waterborne polymers, as the high glass transition (TG) polymers needed to produce hard films to be used as coatings will not produce coherent films at low temperature. This issue has been dealt by the use of temporary plasticizers added with the objective to reduce the TG of the polymers during film formation, while being released to the atmosphere afterwards. The main problem of these temporary plasticizers is their volatile organic nature, which is not recommended for the environment. Therefore, different strategies have been proposed to overcome their massive use. One of them is the use of hydroplasticization, as water, abundant in latexes, can effectively act as plasticizer for certain types of polymers. In this work, the effect of three different grafted hydroplasticizers has been checked in a (meth)acrylate copolymer, concluding that itaconic acid showed the best performance as seen by its low minimum film-formation temperature, just slightly modified water resistance and better mechanical properties of the films containing itaconic acid. Furthermore, film formation monitoring has been carried out by Differential Scanning Calorimety (DSC), showing that itaconic acid is able to retain more strongly the water molecules during the water losing process, improving its hydroplasticization capacity.

scholarly journals Incorporation of Poly(Itaconic Acid) with Quaternized Thiazole Groups on Gelatin-Based Films for Antimicrobial-Active Food Packaging

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 200
Author(s):  
Celeste Cottet ◽  
Andrés G. Salvay ◽  
Mercedes A. Peltzer ◽  
Marta Fernández-García
Keyword(s):  
Antimicrobial Activity ◽  
Itaconic Acid ◽  
Food Packaging ◽  
Crosslinking Agent ◽  
Radical Scavenging ◽  
Proton Nuclear Magnetic Resonance ◽  
Esterification Reaction ◽  
Alkylation Reaction ◽  
Vapor Permeability ◽  
Active Food Packaging

Poly(itaconic acid) (PIA) was synthesized via conventional radical polymerization. Then, functionalization of PIA was carried out by an esterification reaction with the heterocyclic groups of 1,3-thiazole and posterior quaternization by N-alkylation reaction with iodomethane. The modifications were confirmed by Fourier transform infrared (FTIR) and proton nuclear magnetic resonance (1H-NMR), as well as ζ-potential measurements. Their antimicrobial activity was tested against different Gram-negative and Gram-positive bacteria. After characterization, the resulting polymers were incorporated into gelatin with oxidized starch and glycerol as film adjuvants, and dopamine as crosslinking agent, to develop antimicrobial-active films. The addition of quaternized polymers not only improved the mechanical properties of gelatin formulations, but also decreased the solution absorption capacity during the swelling process. However, the incorporation of synthesized polymers increased the deformation at break values and the water vapor permeability of films. The antioxidant capacity of films was confirmed by radical scavenging ability and, additionally, those films exhibited antimicrobial activity. Therefore, these films can be considered as good candidates for active packaging, ensuring a constant concentration of the active compound on the surface of the food, increasing products’ shelf-life and reducing the environmental impact generated by plastics of petrochemical origin.

scholarly journals Stablization of ACOs by NatB mediated N-terminal acetylation is required for ethylene homeostasis

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Hai-qing Liu ◽  
Ya-jie Zou ◽  
Xiao-feng Li ◽  
Lei Wu ◽  
Guang-qin Guo
Keyword(s):  
Protein Modification ◽  
Normal Growth ◽  
Ethylene Biosynthesis ◽  
Regulation Mechanism ◽  
Biological Functions ◽  
Loss Of Function ◽  
Auxiliary Subunit ◽  
Ethylene Content ◽  
Endogenous Ethylene ◽  
Exogenous Ethylene

AbstractN-terminal acetylation (NTA) is a highly abundant protein modification catalyzed by N-terminal acetyltransferases (NATs) in eukaryotes. However, the plant NATs and their biological functions have been poorly explored. Here we reveal that loss of function of CKRC3 and NBC-1, the auxiliary subunit (Naa25) and catalytic subunit (Naa20) of Arabidopsis NatB, respectively, led to defects in skotomorphogenesis and triple responses of ethylene. Proteome profiling and WB test revealed that the 1-amincyclopropane-1-carboxylate oxidase (ACO, catalyzing the last step of ethylene biosynthesis pathway) activity was significantly down-regulated in natb mutants, leading to reduced endogenous ethylene content. The defective phenotypes could be fully rescued by application of exogenous ethylene, but less by its precursor ACC. The present results reveal a previously unknown regulation mechanism at the co-translational protein level for ethylene homeostasis, in which the NatB-mediated NTA of ACOs render them an intracellular stability to maintain ethylene homeostasis for normal growth and responses.

scholarly journals BIOSYNTHESIS OF ITACONIC ACID IN ASPERGILLUS TERREUS

1957 ◽  
Vol 226 (2) ◽  
pp. 689-701
Author(s):  
Ronald Bentley ◽  
Clara P. Thiessen
Keyword(s):  
Itaconic Acid ◽  
Aspergillus Terreus
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