scholarly journals Effects of deacetylation of konjac glucomannan on the physico-chemical properties of surimi gels from silver carp (Hypophthalmichthys molitrix)

RSC Advances ◽  
2019 ◽  
Vol 9 (34) ◽  
pp. 19828-19836 ◽  
Author(s):  
Li Yuan ◽  
Jiamei Yu ◽  
Jianlou Mu ◽  
Tong Shi ◽  
Quancai Sun ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Silver Carp ◽  
Chemical Properties ◽  
Konjac Glucomannan ◽  
Hypophthalmichthys Molitrix ◽  
Physico Chemical

This work studied the effects of KGM with different degrees of deacetylation (DDs) on the physicochemical properties of silver carp (Hypophthalmichthys molitrix) surimi gels.

scholarly journals Physico-Chemical Properties of Deep-Lying Oils

2021 ◽  
Vol 134 (3) ◽  
pp. 11-17
Author(s):  
I. G. Yashchenko ◽  
◽  
Y. M. Polishchuk ◽  
Keyword(s):  
Spatial Distribution ◽  
Physicochemical Properties ◽  
Chemical Properties ◽  
Oil Production ◽  
Urgent Problem ◽  
Physico Chemical ◽  
The World ◽  
Oil Gas

The article is devoted to the urgent problem of studying the features of the properties of poorly studied oils at great depths (more than 4,500 m), the need for development of which is caused by the continuing decline in oil production in traditional oil producing provinces. The analysis of the spatial distribution of reserves across the continents and countries of deep-seated oils and changes in their physico-chemical properties and the occurrence conditions, which made it possible to identify their main features. The studies used information on 21067 oil samples from 167 oil-bearing basins of the world, obtained from the database on the physicochemical properties of oils. The features of the physicochemical properties of deep-seated oils have been established, which are manifested in a decrease in the density and viscosity of oils, in a decrease in the content of sulfur and asphalt-resinous substances, and in an increase in the content of light fractions and oil gas in comparison with oils of small and medium depths.

Researches on the Properties of Stearate-Carboxymethyl Konjac Glucomannan Ester Prepared by Microwave Method

2011 ◽  
Vol 295-297 ◽  
pp. 117-125
Author(s):  
Xiao Man Zeng ◽  
Bei Yu Liu ◽  
Jian Wang ◽  
Geng Zhong ◽  
Yu Hong Xia
Keyword(s):  
Ambient Temperature ◽  
Microwave Heating ◽  
Chemical Properties ◽  
Konjac Glucomannan ◽  
Microwave Method ◽  
Physico Chemical ◽  
Substitution Degree ◽  
Oil Water ◽  
Carboxymethyl Konjac Glucomannan ◽  
Thermal Stable

In this study, microwave heating was used for the preparation of stearate-carboxymethyl konjac glucomannan ester (SCMK), which introduced hydrophilic carboxymethyl and hydrophobic stearate groups on konjac glucomannan (KMG) backbone. The physico-chemical properties and structure of SCMK were investigated. Results show that the viscosity of SCMK is much lower than that of KGM, but larger slightly than the carboxymethyl konjac glucomannan (CMK) and the viscosity is still stable after being placed for 48 h at ambient temperature. Its transmittance decreases and the resistance ability of SCMK solution to salt/sugar as well as base have been significantly promoted. Moreover, SCMK with substitution degree (DS) of 0.02 is proved to be a sound oil/water emulsifier which its HLB value is 13.01. In FTIR spectrum, the absorption peak of SCMK decreases at 2161.84 cm-1 and 2360.74 cm-1. Meanwhile, TGA indicates that SCMK is less thermal stable than KGM and CMK, but is still good.

Modeling Physico-chemical Properties of Quinolone Derivatives Using GA-MLR as a Computational Study

2019 ◽  
Vol 15 ◽  
Author(s):  
Meysam Shirmohammadi ◽  
Esmat Mohammadinasab ◽  
Zakiyeh Bayat
Keyword(s):  
Refractive Index ◽  
Physicochemical Properties ◽  
Energy Gap ◽  
Computational Study ◽  
Chemical Properties ◽  
Theoretical Models ◽  
Lumo Energy ◽  
Physico Chemical ◽  
Leave One Out ◽  
Homo Lumo

: In the present study the applicability of various molecular descriptors was tested for the QSPR study on 40 quinolones derivatives. The relationship between some of the molecular indices with physicochemical properties such as refractive index (n), polarizability (α) and HOMO-LUMO energy gap (ΔEH-L) was represented. At first, the chemical structure of quinolones derivatives was optimized by Gaussian 98 program and ab initio method at the #HF/6-31++G**level, and then the physicochemical properties such as refractive index, polarizability and HOMO-LUMO energy gap were calculated. Genetic algorithm using multiple linear regression (GA-MLR) with backward method by SPSS software was used for obtaining properties. The analytical powers of the established theoretical models were discussed using leave-one-out (LOO) cross-validation technique. A multi-parametric equation containing maximum three descriptors with suitable statistical qualities was obtained for predicting the studied properties.

Physico-Chemical Properties of Konjac Glucomannan

2020 ◽  
pp. 189-207
Author(s):  
Patricia Le Bail ◽  
Céline Lafarge ◽  
Nathalie Cayot
Keyword(s):  
Chemical Properties ◽  
Konjac Glucomannan ◽  
Physico Chemical

scholarly journals A bioinformatics study concerning structural and functional properties of human caveolin proteins

2014 ◽  
Vol 79 (2) ◽  
pp. 133-150
Author(s):  
Adriana Isvoran ◽  
Dana Craciun ◽  
Alecu Ciorsac ◽  
Nahuel Perrot ◽  
Veronica Beswick ◽  
...  
Keyword(s):  
Secondary Structure ◽  
Physicochemical Properties ◽  
Functional Properties ◽  
Chemical Properties ◽  
Caveolin 1 ◽  
Physico Chemical ◽  
Structural And Functional Properties ◽  
Bioinformatics Study ◽  
Sequences Alignment ◽  
Good Agreement

We performed a bioinformatics study to predict and compare the structural and functional properties of human caveolins: caveolin-1, -2 and -3. The computed local physico-chemical properties, predictions of their secondary structure elements and interacting partners of caveolin-2 and -3 are compared to experimentally proved structural and functional properties of caveolin-1. These data combined with the sequences alignment of the three caveolins, allowed predicting and characterizing the functional domains of caveolin-2 and -3. The hydrophobic regions of these proteins are highly similar in sequences and physicochemical properties and it is in good agreement with their known membrane locations and functions. The most divergent in sequences and properties are the C-terminal regions of caveolins suggesting that they might be responsible for their distinct predicted interactions, with direct consequences on signalling processes.

scholarly journals Leaching of Herbicides Commonly Applied to Sugarcane in Five Agricultural Soils

2019 ◽  
Vol 37 ◽  
Author(s):  
A.C.D. GUIMARÃES ◽  
K.F. MENDES ◽  
T.F. CAMPION ◽  
P.J. CHRISTOFFOLETI ◽  
V.L. TORNISIELO
Keyword(s):  
Physicochemical Properties ◽  
Weed Management ◽  
Soil Profile ◽  
Agricultural Soils ◽  
Chemical Properties ◽  
Rainfall Simulation ◽  
Mitigation Measures ◽  
Physico Chemical ◽  
Chemical Properties Of Soils ◽  
Potential Contaminant

ABSTRACT: Leaching intensity depends on the physicochemical properties of soils and herbicides. Consequently, a good understanding of this process is essential to determine mitigation measures to reduce or eliminate the risk of water contamination around areas with sugarcane crops. Therefore, the objective of this study was to analyze the leaching of ametryn, diuron, hexazinone, and metribuzin by using columns in five soils with different physicochemical properties cultivated with sugarcane. The radiolabeled herbicides with 14C were evaluated at six soil depths (0-0.05, 0.05-0.10, 0.10-0.15, 0.15-0.20, 0.20-0.25, and 0.25-0.30 m) and in the leachate after 200 mm rainfall simulation for 48 h. Herbicide leaching was mostly affected by soil type. Ametryn and diuron were reported in the highest amount (>87%) on the topsoil (0-0.05 m), which was indicative of the low leaching of these two herbicides in the soil profile. Thus, these herbicides can contaminate surface water by runoff. Leachate percentage was always <0.3% for ametryn, diuron, and metribuzin; this was also the case for hexazinone in two out of the five soils. Hexazinone proved to be a potential contaminant of groundwater and metribuzin presented high leaching in the soil profile. Previous knowledge of the physico-chemical properties of soils cultivated with sugarcane is essential to recommend the use of these herbicides in weed management.

scholarly journals Modified lead dioxide for organic wastewater treatment: Physicochemical properties and electrocatalytic activity

2019 ◽  
Vol 84 (2) ◽  
pp. 187-198 ◽  
Author(s):  
Olesia Shmychkova ◽  
Tatiana Luk’yanenko ◽  
Larisa Dmirtikova ◽  
Alexander Velichenko
Keyword(s):  
Wastewater Treatment ◽  
Physicochemical Properties ◽  
Electrochemical Oxidation ◽  
Oxygen Evolution ◽  
Electrocatalytic Activity ◽  
Lead Dioxide ◽  
Chemical Properties ◽  
Destruction Rate ◽  
Physico Chemical ◽  
Pbo2 Anode

An investigation is reported on lead dioxide electrodeposition from methanesulfonate electrolytes additionally containing Ni2+ ions. It is shown that lead dioxide electrodes micromodified by nickel have different physico-chemical properties vs. nonmodified PbO2-anodes that are formed during the deposition. Electrocatalytical reactivity of electrodes involved in comparison to both the oxygen evolution, as well as to the electrooxidation of 2,4- dichlorophenoxyacetic (2,4-D) acid is investigated. Processes of electrochemical oxidation of 2,4-D on various materials occur qualitatively with the same mechanism and differ only in the rate. It is shown that the Ni-PbO2-anode possesses the highest electrocatalytic activity: the destruction rate of 2,4-D on it increases in 1.5 times in comparison with nonmodified lead dioxide. The COD of a 0.4 mM solution of 2,4-D, determined by the dichromate method, is 90.0 mg dm-3 which is 94 % of the theoretical value.

scholarly journals Effects of organic acid on the physicochemical properties of gelatine extracted from Fringescale sardinella (Sardinella fimbriata) bones

Food Research ◽  
2021 ◽  
Vol 5 (4) ◽  
pp. 294-302
Author(s):  
N.M. Arshad ◽  
M. Abd. Ghaffar ◽  
N.F. Mohtar
Keyword(s):  
Melting Point ◽  
Physicochemical Properties ◽  
Organic Acid ◽  
Chemical Properties ◽  
Extraction Process ◽  
Gel Strength ◽  
Inorganic Acid ◽  
Alternative Source ◽  
Physico Chemical ◽  
By Products

Gelatine from marine sources especially from the fish becomes a popular alternative to replace the commercial gelatines from bovine and porcine. Fringescale sardinella (Sardinella fimbriata) is commonly used in the fish processing industry and has a high potential to produce gelatine from its by-products. The extraction of gelatine is one of the most important steps that influence its functional properties. Inorganic acid was commonly used in the extraction, however, nowadays it faces some issues due to health safety and its effect on the environment. The aim of this study was to assess the effects of organic acid (fruit vinegar) as a replacement for inorganic acid (hydrochloric acid) during extraction on the physicochemical properties of S. fimbriata gelatine. The extracted gelatines were characterized in terms of their physico-chemical properties such as the yield percentage, gel strength, melting point, molecular weight, structural composition, and amino acid analyses. Results showed that gelatine extracted with organic acid demonstrated low yield percentage (2.9±0.01%) and poor gel strength (75.9±1.06 g) and melting point (22.0±1.00°C) values compared to the standard. This gelatine also demonstrated a low amount of proline and hydroxyproline contents, which were 43.77±8.21 g/mg and 34.99±6.50 g/mg, respectively. Overall findings have suggested that different types of acid used in the extraction resulted in different physico-chemical properties of the gelatine. Such findings suggested that S. fimbriata bone hold the potential to be an alternative source for vast applications in industries. Further studies may focus on different concentrations of acid used in the extraction process. Such findings will help to improve S. fimbriata bone gelatine properties for extended uses in various industries.

scholarly journals Analysis of change in the physico-chemical properties of oils depending on the depth and features of deep oils

Georesursy ◽  
2021 ◽  
Vol 23 (3) ◽  
pp. 99-108
Author(s):  
Irina G. Yashchenko ◽  
Vladimir V. Krupitsky ◽  
Yury M. Polishchuk
Keyword(s):  
Physicochemical Properties ◽  
Sedimentary Cover ◽  
Chemical Properties ◽  
Urgent Problem ◽  
Tectonic Processes ◽  
Physico Chemical ◽  
The World ◽  
Different Depths ◽  
Hydrocarbon Deposits ◽  
Oil Gas

The article is devoted to the urgent problem of studying the features of the properties of poorly studied oils at great depths (more than 4,500 m), the need for development of which is caused by a reduction in oil production in traditional oil producing provinces. A study was made of changes in the physicochemical properties and occurrence conditions of oils depending on the depth, which made it possible to clarify the quantitative patterns of changes in the physicochemical properties of oils at different depths and to reveal features of the properties of poorly studied deep-seated oils. The studies used information on 21067 oil samples from 167 oil-bearing basins of the world, obtained from the database on the physicochemical properties of oils. It has been shown that in different oil-bearing basins the density and viscosity of oils decreases with depth. The content of sulfur, resins and asphaltenes also decreases with depth, and the content of light fractions and oil gas increases. The paraffin content increases to a depth of 3-4 km, and then decreases with increasing depth. The features of the physicochemical properties of deep-seated oils have been established, which are manifested in a decrease in the density and viscosity of oils, in a decrease in the content of sulfur and asphalt-resinous substances, and in an increase in the content of light fractions and oil gas. The results of geological modeling of changes in the stress state of rocks associated with the displacement of the foundation blocks due to tectonic processes are considered. It has been shown that at the edges of the downing tectonic blocks at the boundary of the sedimentary cover and the basement, zones of minimum pressure (decompression zones) are formed. The lightest hydrocarbons migrate along the faults into the decompression zones, forming deep-seated hydrocarbon deposits, what can serve as a justification for the features of the properties of deep-seated oils established in the work.

scholarly journals Effect of tree canopy on species composition, diversity and biomass of herbaceous vegetation and soil characteristics in semi-arid forests of the Aravalli hills

2020 ◽  
Author(s):  
Shriya Garg ◽  
Rajendra Kr. Joshi ◽  
Satish Chandra Garkoti
Keyword(s):  
Species Composition ◽  
Physicochemical Properties ◽  
Chemical Properties ◽  
Canopy Gaps ◽  
Herbaceous Species ◽  
Soil Physicochemical Properties ◽  
Herbaceous Vegetation ◽  
Positive Effects ◽  
Physico Chemical ◽  
Semi Arid

Abstract Background: Herbaceous vegetation is of great ecological importance and responds quickly to environmental changes. Present study was aimed to understand the variation in herbaceous species composition, diversity, biomass and soil physicochemical properties in canopy gaps and under the canopy of semi-arid forests in the Aravalli hills. Methods: Four permanent plots consisting of canopy gaps and under canopy were established. To study herbs phytosociological attributes and biomass, 10 quadrats of 0.5 x 0.5 m size were laid in each plot. For soil physico-chemical properties, 5 soil samples were collected randomly at 0-10 cm depth from each plot. Relationship between biodiversity indices, herbs biomass and soil physicochemical properties was determined using Redundancy Analysis (RDA) and correlation analyses. Results: The sites differed in terms of herbaceous species composition, diversity, biomass and soil physico-chemical properties. Canopy gaps were dominated by grasses while forbs were higher under the canopy. Across the sites, poaceae was the dominant family. All species showed contagious distribution pattern. Oplismenus burmannii reported highest IVI (138.0; 230.5) under the canopy while Achyranthes aspera (56.15) and Eragrostis ciliaris (53.1) had highest IVI in canopy gaps. Diversity indices were higher in canopy gaps. Herbaceous community biomass in canopy gaps ranged from 700-900 gm-2 while under the canopy it ranged from 30-70 gm-2. Cenchrus ciliaris (597.97 gm-2) and Chrysopogon sp. (391.2 gm-2) constituted major proportion of biomass in canopy gaps. The soil of under canopy regions had lower pH and bulk density, but higher soil moisture (%), electrical conductivity, soil organic carbon (SOC), soil total nitrogen (TN), SOC stock and soil TN stock than the canopy gaps. Linear positive relationship between species diversity and biomass; negative relationship between soil chemical properties and herbaceous biomass was found in study area. Even though canopy had positive effects on soil physico-chemical properties, overall negative effect on herbaceous diversity and biomass was seen. Conclusions: Reduced light for photosynthesis and tree root competition for soil resources may be the major factors negatively affecting herbaceous diversity and biomass. Canopy had a significant impact and herbs species composition, diversity, biomass and soil physico-chemical properties showed distinct differences in relation to it.

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