scholarly journals Epipyrone A, a Broad-Spectrum Antifungal Compound Produced by Epicoccum nigrum ICMP 19927

Molecules ◽  
2020 ◽  
Vol 25 (24) ◽  
pp. 5997
Author(s):  
Alex J. Lee ◽  
Melissa M. Cadelis ◽  
Sang H. Kim ◽  
Simon Swift ◽  
Brent R. Copp ◽  
...  
Keyword(s):  
Antifungal Activity ◽  
Fungal Spores ◽  
Chemical Characterization ◽  
Water Soluble ◽  
Antifungal Compound ◽  
Alkaline Ph ◽  
Epicoccum Nigrum ◽  
Different Temperatures ◽  
Excellent Stability

We have isolated a filamentous fungus that actively secretes a pigmented exudate when growing on agar plates. The fungus was identified as being a strain of Epicoccum nigrum. The fungal exudate presented strong antifungal activity against both yeasts and filamentous fungi, and inhibited the germination of fungal spores. The chemical characterization of the exudate showed that the pigmented molecule presenting antifungal activity is the disalt of epipyrone A—a water-soluble polyene metabolite with a molecular mass of 612.29 and maximal UV–Vis absorbance at 428 nm. This antifungal compound showed excellent stability to different temperatures and neutral to alkaline pH.

scholarly journals Influence of Drying in Hyptis pectinata Essential Oil

2018 ◽  
Vol 10 (4) ◽  
pp. 96
Author(s):  
Núbia Angélica de Ávila Branquinho ◽  
Fabiano Guimarães Silva ◽  
Osvaldo Resende ◽  
Luiz Cláudio Almeida Barbosa ◽  
Daniel Emanuel Cabral de Oliveira ◽  
...  
Keyword(s):  
Essential Oil ◽  
Anhydrous Sodium Sulfate ◽  
Fixed Bed ◽  
Chemical Characterization ◽  
Automated System ◽  
Caryophyllene Oxide ◽  
System A ◽  
Different Temperatures ◽  
Drying Conditions

The present study assessed the effects of drying at different temperatures (35, 45 and 55 °C) and air velocities (1 and 2 m s-1) on the content and chemical characteristics of Hyptis pectinata essential oil. Drying was conducted in a fixed-bed dryer, and the temperatures and air velocities were controlled and recorded by an automated system. A 350±0.12 g quantity of fresh leaves was used for each of the four repetitions in each dryer. From the material obtained after drying, 60 g of each repetition was used to extract essential oil by the hydrodistillation method. Dichloromethane was used as the solvent, and anhydrous sodium sulfate was used as the desiccating agent. Gas chromatography in the forms of GC-MS and GC-FID were used for the chemical characterization of the essential oil compounds. Decreasing drying times and decreasing concentrations of essential oils were observed with increasing temperatures. A GC-MS analysis of the essential oil from H. pectinata leaves led to the identification of 19 compounds. A sesquiterpene called caryophyllene oxide was the most abundant compound under all drying conditions, with the highest concentration at a temperature of 55 °C, ranging from approximately 42 to 53%.

The Role of Temperature on Hydration of Binary System of Metakaolin/Portland Cement

2016 ◽  
Vol 851 ◽  
pp. 51-56 ◽  
Author(s):  
Martin Boháč ◽  
Radoslav Novotný ◽  
Jakub Tkacz ◽  
Miroslava Hajdúchová ◽  
Martin Palou ◽  
...  
Keyword(s):  
Binary System ◽  
Portland Cement ◽  
Isothermal Calorimetry ◽  
Chemical Characterization ◽  
Exothermic Peak ◽  
Early Hydration ◽  
Different Temperatures ◽  
C 50

The role of temperature of metakaolin/Portland cement binary system was studied by isothermal calorimetry. Sample with 50 % of metakaolin replacement were monitored at 30 °C, 40 °C, 50 °C and 60 °C. Structural and chemical characterization of hardened pastes was obtained by scanning electron and Raman microscopy. Paper deals with kinetics of main exothermal reactions during early hydration of the system. Activation energies were calculated for processes related to each exothermic peak. The nature of hydration products at different temperatures was revealed by microstructural studies.

Chemical characterization of milk concentrated by ultrafiltration

1984 ◽  
Vol 51 (2) ◽  
pp. 267-278 ◽  
Author(s):  
Margaret L. Green ◽  
K. John Scott ◽  
Malcolm Anderson ◽  
Mary C. A. Griffin ◽  
Frank A. Griffin
Keyword(s):  
Chemical Characterization ◽  
Water Soluble ◽  
Casein Micelles ◽  
Total N ◽  
Globule Size ◽  
Whole Milk ◽  
Differential Retention ◽  
Fat Globule ◽  
Process Damage

SummaryWhole milks concentrated 1·5–4-fold and acidified and citrated milks concentrated 2·8-fold by ultrafiltration at 50 °C were analysed for chemical changes relevant to further processing, storage or nutrition. Fat and protein were entirely retained in the concentrate. The retention of water-soluble vitamins, Ca, Mg, phosphate and trace minerals depended on the proportion bound to the protein. Ascorbic acid was rapidly destroyed during concentration. Because of the differential retention of nitrogenous components, protein comprised a progressively higher proportion of the total N as the milk became more concentrated. No denaturation of whey protein or disruption of casein micelles was detected during concentration of whole milk, but some solubilization of the casein occurred after citration. Reduction of fat globule size occurred early in the concentration process, damage to the fat globule membrane was indicated and the milk became more susceptible to lipolysis. Apart from a tendency for preacidified or precitrated concentrates to gel, no change in the susceptibility of the milks to heat damage was detected.

Chemical characterization of fine aerosols in respect to water-soluble ions at the eastern Middle Adriatic coast

2020 ◽  
Vol 27 (10) ◽  
pp. 10249-10264 ◽  
Author(s):  
Ana Cvitešić Kušan ◽  
Ana Kroflič ◽  
Irena Grgić ◽  
Irena Ciglenečki ◽  
Sanja Frka
Keyword(s):  
Chemical Characterization ◽  
Water Soluble ◽  
Soluble Ions ◽  
Water Soluble Ions ◽  
Adriatic Coast

scholarly journals Preparation and Pharmaco-Mechanical Characterization of Ketoprofen- Polyvinyl Alcohol Cryogel for Medical Applications

2019 ◽  
Vol 70 (3) ◽  
pp. 848-852
Author(s):  
Monica Iliuta Stamate ◽  
Lacramioara Ochiuz ◽  
Daniel Timofte ◽  
Bogdan Ciuntu ◽  
Cristina Ghiciuc ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Mechanical Characterization ◽  
Water Soluble ◽  
Mechanical Resistance ◽  
Medical Applications ◽  
Water Soluble Polymer ◽  
Different Temperatures ◽  
Polymeric Solutions ◽  
Equilibrium Swelling Ratio

Polyvinyl alcohol is a biocompatible polymer used very commonly both in pharmaceutical and medical fields. Being a water-soluble polymer, it is suitable for the manufacture of hydrogels as well as cryogels used for various medical applications. The present work describes the preparation, structural and physico-mechanical characterization of polyvinyl alcohol cryogels loaded with ketoprofen. By cryogenic technique the polymeric solutions are transformed under certain conditions into porous, elastic and very compressible structures. They are able to absorb a large amount of liquids that they give off by gentle compression. The prepared cryogels were evaluated for different physical, chemical and structural properties, as following: internal morphology, equilibrium swelling ratio and mechanical testing. The cryogel structures show good elasticity and optimal swelling at different temperatures. Due to these properties the studied cryogels are suitable for use in various medical applications involving liquid absorption, mechanical resistance and anti-inflammatory effect.

scholarly journals Chemical Characterization of Volatile Compounds of Lantana camara L. and L. radula Sw. and Their Antifungal Activity

Molecules ◽  
2012 ◽  
Vol 17 (10) ◽  
pp. 11447-11455 ◽  
Author(s):  
Juliana Lanna Passos ◽  
Luiz Claudio Almeida Barbosa ◽  
Antonio Jacinto Demuner ◽  
Elson Santiago Alvarenga ◽  
Cleiton Moreira da Silva ◽  
...  
Keyword(s):  
Antifungal Activity ◽  
Volatile Compounds ◽  
Chemical Characterization ◽  
Lantana Camara

Chemical characterization of water-soluble pectin in papaya fruit

1991 ◽  
Vol 15 (1) ◽  
pp. 67-78 ◽  
Author(s):  
E. Westerlund ◽  
P. Åman ◽  
R. Andersson ◽  
R.E. Andersson ◽  
S.M.M. Rahman
Keyword(s):  
Chemical Characterization ◽  
Water Soluble
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