Morphological, thermal and mechanical properties of polyamide and ethylene vinyl alcohol multilayer flexible packaging after high-pressure processing

Publication date: July 2020Source: Journal of Food Engineering, Volume 276Author(s): Luís Marangoni Júnior, Léa Mariza de Oliveira, Paula Fernanda Janetti Bócoli, Marcelo Cristianini, Marisa Padula, Carlos Alberto Rodrigues AnjosAbstractThe effect of high-pressure processing on the morphological surface, thermal and mechanical properties of three PA and EVOH based multilayer flexible packaging materials were evaluated. LDPE/PA/LDPE, LDPE/EVOH/LDPE and PET/LDPE/PA/EVOH/PA/LDPE packaging samples were processed under three different conditions (600 MPa/25 °C/10 min, 600 MPa/90 °C/10 min and 0.1 MPa/90 °C/10 min) and an unprocessed sample was used as control. The LDPE/PA/LDPE and LDPE/EVOH/LDPE samples showed good thermal stability and no surface defects after processing, because of the greater thickness of the external material, the film withstood the compression and decompression of the processing, consequently resulting in the protection of the other layers. The PET/LDPE/PA/EVOH/PA/LDPE sample showed a significant increase in the Tm of PET, LDPE and PA after processing at 600 MPa/90 °C/10 min. Regarding the mechanical properties, reductions in the tensile strength of the PET/LDPE/PA/EVOH/PA/LDPE sample were observed after processing at 600 MPa/90 °C/10 min. In addition, a significant reduction in heat seal strength was observed in the three materials after processing at 600 M...
Source: Journal of Food Engineering - Category: Food Science Source Type: research

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Conclusion: The present investigations have exposed that the myrtle berries:cloves, myrtle berries: cinnamon:cloves extracts could be used in traditional medicine as natural antimicrobial agents in treatment the bacterial infections.
Source: Current Nutrition and Food Science - Category: Nutrition Source Type: research
ConclusionHandrubbing with sprayed ABHR was non-inferior to rubbing with ABHR poured onto a hand palm to reduce bacterial counts on hands under experimental conditions. Rubbing with sprayed ABHR may be an acceptable alternative hand hygiene method pending assessment in other settings and for other pathogens.
Source: Journal of Hospital Infection - Category: Infectious Diseases Source Type: research
Conclusion: The ability of E. senticosus root and bark extracts to promote polarization of human macrophages towards anti-inflammatory M2a and M2b phenotypes, respectively, might underlay the immunoregulatory activities and point to potential wound healing promoting effects of this medicinal plant.Graphical abstract
Source: Phytomedicine - Category: Drugs & Pharmacology Source Type: research
Abstract 1-Cyanocyclohexaneacetic acid (1-CHAA) is a critical intermediate for the synthesis of the antiepileptic agent gabapentin. Previously, our group has established a novel manufacturing route for 1-CHAA through bioconversion catalyzed by an Escherichia coli (E. coli) nitrilase whole cell catalyst. However, the nitrilase expressed in E. coli has several drawbacks such as a low level of reusability, which hampered its industrial application. Herein, we investigated the potential of using the methylotrophic yeast Pichia pastoris (P. pastoris) for producing the nitrilase whole cell catalyst. To achieve strains w...
Source: Applied Microbiology and Biotechnology - Category: Microbiology Authors: Tags: Appl Microbiol Biotechnol Source Type: research
Abstract Benzyl alcohol is a naturally occurring aromatic alcohol and has been widely used in the cosmetics and flavor/fragrance industries. The whole-cell biotransformation for synthesis of benzyl alcohol directly from bio-based L-phenylalanine (L-Phe) was herein explored using an artificial enzyme cascade in Escherichia coli. Benzaldehyde was first produced from L-Phe via four heterologous enzymatic steps that comprises L-amino acid deaminase (LAAD), hydroxymandelate synthase (HmaS), (S)-mandelate dehydrogenase (SMDH) and benzoylformate decarboxylase (BFD). The subsequent reduction of benzaldehyde to benzyl...
Source: Chemistry, an Asian Journal - Category: Chemistry Authors: Tags: Chem Asian J Source Type: research
Conclusions: This study demonstrated the possibility of using ethanol as the carbon source by engineered E. coli strains. It can serve as the basis for the construction of more robust strains in the future though the catabolic capacity of ethanol should be further improved. PMID: 31993378 [PubMed]
Source: Cell Research - Category: Cytology Authors: Tags: J Biol Res (Thessalon) Source Type: research
Publication date: 2020Source: Toxicology Reports, Volume 7Author(s): Afaf M. Weli, Hanady S. Al-Saadi, Rouqaya S. Al-Fudhaili, Amzad Hossain, Zabida Binti Putit, Mahmood K. JasimAbstractMedicinal plant as herbal medicine is widely used to cure infectious diseases. Rubus fruticosus L (R. fruticosus) has been studied for its antimicrobial and cytotoxic activities. Different polarity leave extracts were prepared by using hexane, chloroform, ethyl acetate and hydro alcoholic solvents. Agar diffusion method has been used to assess the antibacterial activity against two gram-positive Enterococcus faecalis and Staphylococcus aure...
Source: Toxicology Reports - Category: Toxicology Source Type: research
iérrez A, Martínez AT Abstract Unspecific peroxygenases (UPOs) constitute a new family of fungal heme-thiolate enzymes with high biotechnological interest. Although several thousand genes encoding hypothetical UPO-type proteins have been identified in sequenced fungal genomes and other databases, only a handful of UPO enzymes have been experimentally characterized to date. Therefore, gene screening and heterologous expression from genetic databases is a priority in the search for ad-hoc UPOs for oxyfunctionalization reactions of interest. Very recently, Escherichia coli production (as a soluble and a...
Source: Applied and Environmental Microbiology - Category: Microbiology Authors: Tags: Appl Environ Microbiol Source Type: research
Publication date: Available online 22 January 2020Source: Biochimica et Biophysica Acta (BBA) - Proteins and ProteomicsAuthor(s): Esther S. Taxon, Lila P. Halbers, Stanley M. ParsonsAbstractTwo groups of metabolically related enzymes, the Group III family of Fe2+-dependent alcohol dehydrogenases (ADHs) and the separate subfamily of nucleoside diphosphates linked to x (nudix) hydrolases that activate Group III ADHs are under-characterized. Here we report the steady-state initial-velocity forward direction (alcohol → aldehyde) reaction of a Group III ADH, namely gamma-hydroxybutyrate dehydrogenase (GHBDH, UniProt: Q5910...
Source: Biochimica et Biophysica Acta (BBA) Proteins and Proteomics - Category: Biochemistry Source Type: research
Abstract Amatoxin poisoning is the main cause of death from accidental ingestion of poisonous mushrooms and a mortality rate of 27.3% has been reported in Thailand. Symptoms of mushroom ingestion are often confused with food poisoning; thus, gastroenteritis is not recognised as the first phase of poisoning. Our study assessed the efficacy of N-acetylcysteine (NAC) as a treatment for amatoxin poisoning. We retrospectively analysed 74 medical records over 12 years. The majority (70/74) were treated successfully with NAC; death in the remaining 4 (5.4%) patients was attributed to late presentation in three and advanc...
Source: Tropical Doctor - Category: Tropical Medicine Authors: Tags: Trop Doct Source Type: research
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