Improving properties of thermoplastic starch films by incorporating active extracts and cellulose fibres isolated from rice or coffee husk

Publication date: December 2019Source: Food Packaging and Shelf Life, Volume 22Author(s): Sofía Collazo-Bigliardi, Rodrigo Ortega-Toro, Amparo ChiraltAbstractHydrothermal (60 min, 180 °C) extracts and cellulose fibres from coffee and rice husks were obtained to be incorporated into corn starch films, in order to improve the film functional properties as food packaging material and confer them active properties. Extracts exhibited antioxidant properties (EC50: 5.37–5.29 mg extract solids/mg DPPH) and antibacterial activity against Listeria innocua and Escheriquia coli (MIC values: 35–45 and 34–35 mg extract solids/mL, respectively). The active extracts improved tensile properties of the starch films; elastic modulus increased by about 350% and films become less stretchable. The cellulosic fibres from both residues were more effective as reinforcing agents in films containing extract solids than in net starch films. Extracts also provoked 30% reduction in the WVP of starch films and 50–85 % reduction in the oxygen permeability, depending on their amount in the films, but no effect of cellulose fibres was observed on barrier properties.
Source: Food Packaging and Shelf Life - Category: Food Science Source Type: research

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Publication date: December 2019Source: Food Packaging and Shelf Life, Volume 22Author(s): Yeong-Ju Bang, Shiv Shankar, Jong-Whan RhimAbstractSilver nanoparticles (AgNP) were synthesized in situ by reducing AgNO3 using resorcinol and gelatin to prepare functional gelatin/resorcinol/AgNP nanocomposite films (Gel/Res/AgNP). The nanocomposite film exhibited a characteristic light absorption peak of AgNP at 420 nm and improved UV-light barrier property. X-ray diffraction (XRD) results also showed a characteristic reflection peak of crystalline AgNP around 2θ = 38° corresponding to the (111) diffraction plane of ...
Source: Food Packaging and Shelf Life - Category: Food Science Source Type: research
Updated Date: Fri, 13 Sep 2019 00:00:00 EDT
Source: DailyMed Drug Label Updates - Category: Drugs & Pharmacology Source Type: alerts
This study reports ten years of epidemiological surveillance ofL. monocytogenes in Chile. PMID: 31500706 [PubMed - in process]
Source: Food Microbiology - Category: Food Science Authors: Tags: Food Microbiol Source Type: research
We performed a study to (i) investigate efficacy of an Escherichia coli/Salmonella spp./Listeria monocytogenes-targeting bacteriophage cocktail (tentatively named F.O.P.) to reduce a human pathogenic E. coli strain O157:H7 in experimentally infected mice, and (ii) determine how bacteriophages impact the normal gut microbiota when compared with antibiotic therapy. A total of 85 mice were inoculated with E. coli O157:H7 strain Ec231 [nalidixic acid resistant (NalAcR)] via oral gavage, and were randomized into six groups separated into three categories: 1st category received PBS or No phage/No PBS (control), 2nd category rece...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
In this study, the antimicrobial effects of cumin essential oil (CEO) and its mechanism of action through scanning electron microscopy (SEM) against Escherichia coli and Listeria innocua were investigated. The SEM images were taken at 0, 12 and 24 h at the minimum inhibitory concentration (MIC). The chemical composition of CEO was identified through gas chromatography/mass spectrometry (GC-MS). The antimicrobial effects of CEO were evaluated by the methods of Kirby-Bauer, well diffusion agar, microdilution broth and minimum bactericidal/fungicidal concentration (MBC/MFC). Antioxidant activity was examined by the method...
Source: Microbial Pathogenesis - Category: Infectious Diseases Source Type: research
This study provides reference data for the design of clinically effective antibacterial peptides.
Source: Microbial Pathogenesis - Category: Infectious Diseases Source Type: research
Publication date: December 2019Source: LWT, Volume 116Author(s): Saerom Lee, Misook KimAbstractHere, the multi-functional properties of Leuconostoc mesenteroides MKSR (MKSR), newly isolated from the Korean fermented vegetable product, kimchi, were evaluated. The survival rate of MKSR was 98% in 0.1% pepsin solution (pH 2.0) after 3 h, and 93% in 0.1% bile salt solution after 4 h. MKSR possessed strong antibacterial activity against Staphylococcus aureus, Shigella flexneri, Bacillus cereus and Listeria innocua, and antibiotic susceptibility to chloramphenicol. The organism lacked β-glucuronidase catalytic activity ...
Source: LWT Food Science and Technology - Category: Food Science Source Type: research
A putative open reading frame encoding GTP cyclohydrolase I from Listeria monocytogenes was expressed in a recombinant Escherichia coli strain. The recombinant protein was purified and was confirmed to convert GTP to dihydroneopterin triphosphate (Km = 53   µ M; vmax = 180   nmol   mg − 1   min − 1). The   protein was crystallized from 1.3   M sodium citrate pH 7.3 and the crystal structure was solved at a resolution of 2.4   Å (Rfree = 0.226) by molecular replacement using human GTP cyclohydrolase I as a template. The protein is a D5-symmetric decamer with ten topologically equival...
Source: Acta Crystallographica Section F - Category: Biochemistry Authors: Tags: GTP cyclohydrolase I Listeria monocytogenes crystal structure high-throughput screening tetrahydrofolate biosynthesis listeriosis research communications Source Type: research
Publication date: Available online 27 August 2019Source: Sensors and Actuators B: ChemicalAuthor(s): Sumaira Sharif, Yixian Wang, Zunzhong Ye, Zhen Wang, Qimin Qiu, Shengna Ying, Yibin YingAbstractA novel impedimetric sensor was developed for the detection of loop mediated isothermal amplification (LAMP) amplicons of various foodborne pathogens through combining with a microfluidic system and magnetic separation procedure. The amplified nucleic acid products (amplicons) of the LAMP reaction can adsorb on magnetic beads surface via electrostatic adsorption process. The obtained nucleic acid-magnetic bead composites were re-...
Source: Sensors and Actuators B: Chemical - Category: Chemistry Source Type: research
Publication date: Available online 22 August 2019Source: LWTAuthor(s): Shunmugavel Uma Maheshwari, Sundarajan Amutha, Rangasamy Anandham, Ganapathyswamy Hemalatha, Natesan Senthil, Soon Woo Kwon, Natesan SivakumarAbstract:Panchamirtham is a fermented fruit mix made from natural fermentation of fruits (banana, brown sugar, seedless dates, sugar candy, honey, cardamom and ghee), which offers multiple health benefits to human. Research on fermented foods for probiotic microorganisms remains scarce compared to other dairy products. Hence, this present study was aimed to characterise the cultivable bacteria associated with panc...
Source: LWT Food Science and Technology - Category: Food Science Source Type: research
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