scholarly journals Chitosan and Cystatin/Lysozyme Preparation as Protective Edible Films Components

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Anna Zimoch-Korzycka ◽  
Antoine Rouilly ◽  
Łukasz Bobak ◽  
Andrzej Jarmoluk ◽  
Michał Korzycki
Keyword(s):  
Hydroxypropyl Methylcellulose ◽  
Chemical Properties ◽  
Inhibition Zone ◽  
Mechanical Analysis ◽  
Edible Films ◽  
Vapour Permeability ◽  
Candida Famata ◽  
Higher Temperature ◽  
Physical And Chemical ◽  
And Storage

This work characterizes biological, physical, and chemical properties of films formed from an aqueous solution of hydroxypropyl methylcellulose (HPMC), with different concentrations of chitosan (CH) and bioactive cystatin/lysozyme preparation (C/L). The properties of biocomposites were examined by Dynamic Mechanical Analysis (DMA), Fourier’s transfer infrared spectroscopy (FTIR), water vapour permeability (WVP), and tensile testing. Antimicrobial activity againstMicrococcus flavus,Bacillus cereus,Escherichia coli,Pseudomonas fluorescens, andCandida famatawas conducted. Films glass transition and storage modulus were dependent on the C/L and CH concentration. Modulus values decreased during the temperature scan and with higher reagents levels. An increase of CH and C/L concentrations in the films resulted in a decrease in tensile strength from 2.62 to 1.08 MPa. It suggests the hydrolyzing influence of C/L, also observed in smaller peak size ofαrelaxation. C/L addition caused shiftingTgto higher temperature. DMA and FTIR analysis proved that HPMC and CH are compatible polymers. Water resistance was improved with rising CH concentration from1.08E-09to7.71E−10 g/m∗s∗Pa. The highest inhibition zone inM. flavusandC. famatawas recorded at the highest concentration of CH and C/L.

scholarly journals Modification Effect of Cellulase on the Physicochemical Characteristic of Polysaccharides Edible Films

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Anna Zimoch-Korzycka ◽  
Jagoda Ambrozik-Haba ◽  
Dominika Kulig ◽  
Andrzej Jarmoluk
Keyword(s):  
Contact Angle ◽  
Hydroxypropyl Methylcellulose ◽  
Physicochemical Characteristic ◽  
Edible Films ◽  
Enzyme Treatment ◽  
Infrared Spectrometry ◽  
Vapour Permeability ◽  
Physicochemical Stability ◽  
Higher Temperature ◽  
Thermal Stability Of

This study was conducted to assess hydrolytic influence of cellulase (C) on the physicochemical stability of chitosan (CH)/hydroxypropyl methylcellulose (HPMC) films in time of storage (T). Initially, nine films were physically characterized by contact angle, water vapour permeability (WVP), water activity(aw), tensile test, dynamic mechanical thermal analysis (DMTA), and thermogravimetric analysis (TGA) and chemically by Fourier Transform Infrared Spectrometry (FTIR). The contact angle results varied from 53.67° to 78.33°. The presence of the enzyme and passing time reduced the WVP from8.46E-09to7.41E-09 g/s·m·Pa. The enzyme treatment improved elasticity but decreased tensile strength of films. After adding cellulaseTgwas shifted to a higher temperature. Thermal stability of the films decreased with addition of cellulase and after prolonging storage time. FTIR analysis proved that chemical changes in polysaccharides structure were caused by cellulase incorporation in films composition, which may be observed in appearance of 1656 cm−1band. Theawvalues did not change.

scholarly journals The Effect of Coating as Antifungi of Harumanis Mango's Post Harvest Losses

2020 ◽  
Vol 1 (2) ◽  
pp. 7-16
Author(s):  
Winda Amilia ◽  
Andrew Setiawan Rusdianto ◽  
Arma Dwi Novemi
Keyword(s):  
Corn Starch ◽  
Chemical Properties ◽  
Inhibition Zone ◽  
Post Harvest ◽  
Physical Chemical ◽  
Chemical Content ◽  
Total Dissolved Solid ◽  
Tobacco Extract ◽  
Physical And Chemical

The amount of mango production in Indonesia is quite high, but the quality of postharvest mangoes is still quite low. The quality of the fruit will decline due to contamination; one of the contaminants is fungi. The way to reduce the damage of postharvest products is by coating applications. The purpose of this study was to study the physical, chemical and antifungal activities of harumanis mangoes’s quality which had been given coating during storage that could cause postharvest losses of harumanis mangoes. There are 3 treatments, each of them are respectively the provision of corn based coating  6% tobacco extract, 8% tobacco extract and 10% tobacco extract. The physical and chemical properties of the antifungal coating of tobacco extract made from corn coating for post-harvest damage on harumanis mangoes were obtained by weight loss, texture, colour, respiration rate, vitamin C and total dissolved solid. Preventing coating can prevent damage after harvest and protect the harumanis mango; therefore the quality of the mangoes can be maintained. The best results from the priority with the largest diameter inhibition zone were given corn starch 10% tobacco extract. Then the higher the concentration of extract used, the greater the diameter of the inhibition zone obtained. Based on all the tests performed (physical, chemical, and antifungal) the best treatment from the treatment was obtained that consisted of mangoes with antifungal layers of corn starch 10% tobacco extract. Because the P3 obtained the best results in maintaining physical, chemical content and fungi for 15 days.

Air

2020 ◽  
pp. 139-177
Author(s):  
John Evans
Keyword(s):  
Carbon Capture ◽  
High Performance ◽  
Internal Combustion Engines ◽  
Atmospheric Oxygen ◽  
Carbon Capture And Storage ◽  
Chemical Properties ◽  
Energy Capture ◽  
Physical And Chemical ◽  
And Storage

The chemical properties of the volatile elements in groups 15 to 18 are outlined, showing how the the periodicicty of the properties of the elements shapes their chemistry. The manufacture of hydrogen and chlorine is described, showing how mercury-free methods have been developed for the latter. The effect of the formation of atmospheric CO2 on atmospheric oxygen content is explained in terms of dissolution in the oceans. Remediation of the exhaust gases from internal combustion engines by catalysts to remove CO2, NOx and carbonaceous particulates is explained. Options for carbon capture and storage by physical and chemical processes are evaluated, and examples provided of these processes in operation. Exploitation of the atmosphere for energy capture using wind turbines has been aided by the development of high performance magnets. The basis of these magnets and the role of rare earth elements is explained.

scholarly journals Green Synthesis of Mn + Cu Bimetallic Nanoparticles Using Vinca rosea Extract and Their Antioxidant, Antibacterial, and Catalytic Activities

Crystals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 72
Author(s):  
Mohamad M. Ahmad ◽  
Hicham Mahfoz Kotb ◽  
Shehla Mushtaq ◽  
Mir Waheed-Ur-Rehman ◽  
Christopher M. Maghanga ◽  
...  
Keyword(s):  
Bimetallic Nanoparticles ◽  
Dye Degradation ◽  
Antibacterial Properties ◽  
Chemical Properties ◽  
Inhibition Zone ◽  
Vinca Rosea ◽  
Ft Ir ◽  
Average Size ◽  
Phytochemical Components ◽  
Physical And Chemical

This article outlines the preparation of manganese-doped copper nanoparticles (Mn + Cu NPs) using Vinca rosea (L.) leaf extract as a convenient and environmentally friendly substance. UV–vis, FT–IR, XRD, SEM–EDAX, and DLS instrumental techniques were employed to describe the physical and chemical properties of synthesized V. rosea extract-mediated Vr-Mn + Cu NPs. The synthesized Vr-Mn + Cu NPs were observed to be monodispersed and spherical, with an average size of 412 nm. The plant extract includes a variety of phytochemical components. The Vr-Mn + Cu NPs also have potential antioxidant and antibacterial properties against selected pathogens. The green synthesized Vr-Mn + Cu NPs showed a maximum inhibition zone of 16.33 ± 0.57 mm against E. coli. For dye degradation, MR, EBT, and MO showed the highest degradation percentage capabilities with Vr-Mn + Cu NP-based adsorbents, which were determined to be 78.54 ± 0.16, 87.67 ± 0.06, and 69.79 ± 0.36. The results clearly show that biosynthesized Vr-Mn + Cu NPs may be employed as an antioxidant, antibacterial, photocatalytic dye degradation, and catalytic agent, as well as being ecologically benign.

scholarly journals Combination Gel Formulation Extracts of Moringa Leaf and Red Betel Leaf as an Inhibitor of Acne-Causing Bacteria (Propionibacterium acne and Staphylococcus aureus)

2021 ◽  
Vol 8 (3) ◽  
pp. 18-23
Author(s):  
Eko Sri Wahyuningsih ◽  
Wahono Sumaryono ◽  
Chaidir Chaidir
Keyword(s):  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Inhibition Zone ◽  
Diffusion Method ◽  
Chemical Parameters ◽  
Physical And Chemical Parameters ◽  
Gel Preparation ◽  
Physical And Chemical ◽  
And Storage ◽  
And Staphylococcus Aureus

The most common skin disorder is acne (Acne vulgaris) which is a chronic inflammatory disease that occurs in the pilosebaceous unit. Infection can be caused by Propionibacterium acnes and Staphylococcus aureus. Moringa leaves are known to inhibit acne growth. Piper crocatum leaves are also thought to have antibacterial activity. The study aims to determine the effect of the combination of the two extracts in inhibiting the growth of acne-causing bacteria, also tested the gel formula to meet physical and chemical parameters as well as stability to temperature and storage, also to test the acute dermal irritation against rabbit. Each extract with a concentration of 0.3%; 0.6%; 1.25%; 2.5%; 5%; 10%; 20%, incubated then measured the inhibition zone, then determined the minimum inhibition zone concentration of the two extracts to determine the lowest levels of the extracts which still gave antibacterial activity against the tested bacteria by the well diffusion method. The extract combination was formulated in a gel preparation with the excipients Carbopol 940, PG, Phenoxyethanol, TEA, CMC, and Aquadest. Antibacterial activity test for gel preparations used the well method with positive control Medi-Klin® gel. Then the formula evaluation includes physical, chemical, and microbiological evaluations. The results showed that the combination gel form had activity against P. acne and S. aureus at concentrations of 2.5% : 2.5%. The combination gel preparation of the two extracts also has synergistic effect in inhibiting acne bacteria. The formula can meet physical and chemical parameters and is stable to temperature and storage.

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