scholarly journals Tryptic phosphopeptides from whole casein. II. Physicochemical properties related to the solubilization of calcium

1989 ◽  
Vol 56 (3) ◽  
pp. 335-341 ◽  
Author(s):  
Rafael Berrocal ◽  
Serge Chanton ◽  
Marcel A. Juillerat ◽  
Blaise Favillare ◽  
Jean-Claude Scherz ◽  
...  
Keyword(s):  
Binding Sites ◽  
Calcium Phosphates ◽  
Chemical Properties ◽  
Sodium Caseinate ◽  
Ph Values ◽  
Physico Chemical ◽  
Casein Phosphopeptides ◽  
Hydrolysis Of ◽  
Phosphate Solutions ◽  
Tryptic Hydrolysis

SummaryCasein phosphopeptides (GPP) were produced by tryptic hydrolysis of sodium caseinate and further purified by precipitation and chromatography on QAE-Sephadex A-25. Their physico-chemical properties were compared with the properties of an enzymically dephosphorylated equivalent preparation (DPP). Binding of Ca2+ to the peptides was measured using a Ca selective electrode and was found to increase with pH and to show 1/1 stoicheiometry Ca/Porg in CPP at pH 6·5 a.nd 7·6. Klotz plots indicated equivalent binding sites at these two pH values, but some heterogeneity was seen at pH 3·5. In contrast, DPP did not bind significant amounts of Ca2+.CPP effectively inhibited the formation of insoluble calcium phosphates at different Ca/P ratios. The effective CPP concentration was 10 mg/1 and complete stability of calcium phosphate solutions was obtained at about 100 mg/1. This stabilizing effect was dependent on the presence of organic P.

scholarly journals Physico-Chemical Properties of Sugar Beet Pectin-Sodium Caseinate Conjugates via Different Interaction Mechanisms

Foods ◽  
2019 ◽  
Vol 8 (6) ◽  
pp. 192
Author(s):  
Juyang Zhang ◽  
Bettina Wolf
Keyword(s):  
Sugar Beet ◽  
Thermal Processing ◽  
Chemical Properties ◽  
Sodium Caseinate ◽  
Neutral Ph ◽  
Aggregate Properties ◽  
Physico Chemical ◽  
Acid Tolerant ◽  
Acidic Conditions ◽  
Processing Stability

Polysaccharides and proteins are frequently conjugated through electrostatic attraction, enzymatic cross-linking, and heat treatment (Maillard reaction) to obtain food structuring ingredients, mostly for their application as emulsifiers. The conjugate partners and their interaction type affect performance at acidic or neutral pH and during thermal processing, thus requiring careful selection. Here, the aggregate properties (particle size, conjugate charge, shear viscosity) of three types of sugar beet pectin (SBP)-sodium caseinate (SC) 1:1 conjugates, at acidic and neutral pH (4.5; 7), as well as their thermal processing stability (80 °C), were investigated. The enzymatically cross-linked SBP:SC was more acid tolerant than the electrostatically interacting conjugates. Maillard cross-linked conjugates aggregated at pH 4.5, suggesting poor emulsifier performance in acidic conditions. At pH 7, the three conjugate types showed similar aggregate properties. The results are discussed in terms of structural re-arrangement.

Effects of non-ionic surfactants on the uptake and hydrolysis of fluoresceindiacetate by alkane-oxidizing bacteria

2000 ◽  
Vol 46 (4) ◽  
pp. 387-390 ◽  
Author(s):  
Per Bruheim ◽  
Kjell Eimhjellen
Keyword(s):  
Cell Surface ◽  
Uptake Rate ◽  
Biological Effects ◽  
Quantitative Difference ◽  
Chemical Properties ◽  
Ionic Surfactants ◽  
Physico Chemical ◽  
Hydrolysis Of

Biological effects of non-ionic surfactants on alkane-oxidizing bacteria were studied by assessing their influence on the uptake of prefluorochrome fluoresceindiacetate (FDA) and its intracellular hydrolysis to fluorescein. Both decreasing and increasing rates of hydrolysis as a consequence of the presence of surfactants were observed. The surfactants influenced the uptake of FDA, but not its intracellular hydrolysis. The effects of the surfactants on the uptake rate depended strongly on the structure and physico-chemical properties of the surfactants. There was no qualitative or significant quantitative difference in surfactant susceptibility between induced (alkane grown) and non-induced bacteria (acetate grown), even though the induced cells possess greater cell surface hydrophobicity.Key words: fluoresceindiacetate, bacteria, surfactants, alkane.

scholarly journals Novel Resins for Efficient Desalination

Substantia ◽  
2021 ◽  
pp. 39-48
Author(s):  
Tanita Gettongsong ◽  
Mojtaba Taseidifar ◽  
Richard M. Pashley ◽  
Barry W. Ninham
Keyword(s):  
Chemical Properties ◽  
Strong Acid ◽  
Electrolyte Solutions ◽  
Strong Base ◽  
Ph Values ◽  
Surface Charging ◽  
Physico Chemical ◽  
Electrical Conductivities ◽  
Acid And Base ◽  
Chemical Cross Linking

This paper reports the synthesis and properties of new polymer resins containing strong acid and base groups for optimising applications in desalination. Several polyampholytic gels were synthesised with a ratio of 1:1 of strong acid (sulphonate) and strong base (quaternary ammonium) groups and a zwitterionic resin with a 1:1 strong acid and base ratio. The physico-chemical properties of these highly charged resins were studied in electrolyte solutions over a range of pH values, in particular: effects of chemical cross-linking, water and electrolyte swelling; bulk electrical conductivities and surface charging properties in different pH values. The results from absorption of NaCl showed that the resins have considerable potential for more effective desalination than other resin-based techniques.

scholarly journals Physicochemical Parameters and Heavy Metals Content of Soil Samples from Farms in Minna

2015 ◽  
Vol 58 ◽  
pp. 154-163
Author(s):  
Z. Abdulhamid ◽  
E.B. Agbaji ◽  
C.E. Gimba ◽  
A.S. Agbaji
Keyword(s):  
Heavy Metals ◽  
Cation Exchange Capacity ◽  
Physicochemical Parameters ◽  
Chemical Properties ◽  
Absorption Spectrometry ◽  
Exchange Capacity ◽  
Average Concentration ◽  
Soil Samples ◽  
Ph Values ◽  
Physico Chemical

Physico-chemical properties and heavy metals content of soils were determined from seven farms in Minna, central Nigeria. Conventional analytical methods were employed to determine the physico-chemical properties and the heavy metals were analysed by atomic absorption spectrometry. The result showed that pH values ranged from 6.64 - 7.70 indicating slight acidity to slight alkalinity of the soils. The total organic carbon values ranged from 0.95-2.25 % resulting in the presence of organic matter (1.63-3.87). The electrical conductivity values ranged from 17-37 μS/cm. The cation exchange capacity of the soil samples ranged from 3.68-5.15 cmol/kg. The heavy metals levels were in the following range: Cd (0.00018-0.00134 mg/g), Cu (0.0069-0.0476 mg/g), Fe (1.942-2.2059 mg/g), Mn (0.1825-0.3696 mg/g), Ni (0.0065-0.0069 mg/g) and Zn (0.0157-0.2252 mg/g). The concentration of the metals in the soil samples varied according to the following trend: Fe>Mn>Zn> Cu>Ni>Cd. The average concentration of all the metals in each farm also gave the trend Farm B>Farm G>Farm E>Farm C>Farm F>Farm D>Farm A. The findings indicate the presence of heavy metals in all the farms but only Fe was above the FAO/WHO standards.

scholarly journals Physico-chemical properties of calcium phosphates

2012 ◽  
Vol 59 (1) ◽  
pp. 7-21 ◽  
Author(s):  
Vesna Babic-Ivancic ◽  
Maja Dutour-Sikiric
Keyword(s):  
Calcium Phosphates ◽  
Chemical Properties ◽  
Organic Matrix ◽  
Octacalcium Phosphate ◽  
Carbonate Apatite ◽  
Organic Additives ◽  
Biologically Relevant ◽  
Beta Tricalcium Phosphate ◽  
Physico Chemical

Calcium phosphates have important role in biological and pathological mineralization. While only one of calcium phosphates, carbonate apatite, represents the main mineral component of teeth and bones, octacalcium phosphate, calcium hydrogenphosphate dihydrate and beta-tricalcium phosphate occur in pathological deposits. From the stand-point of chemists, processes of biological and pathological mineralization could be considered as deposition of inorganic phase within organic matrix, i.e. formation of inorganic-organic composites. Although this approach is very simplified at first glance, it allows clarification of important issues related to biomineralization (e.g. what is the role of individual components of organic matrix in the emerging solid tissue), and design and preparation of new materials for hard tissue regeneration (e.g. process of transformation after implantation). The importance of investigation about calcium phosphates will be presented through the overview of basic physico-chemical reactions related to the formation and transformation of biologically relevant calcium phosphates and their interaction with various organic additives in the laboratory.

The influence of anthropogenically increased pH on the content and the mobility of nickel in arable soils in the surroundings of “Małogoszcz” cement plant

2013 ◽  
Vol 64 (1) ◽  
pp. 14-18 ◽  
Author(s):  
Hanna Jaworska ◽  
Agata Bartkowiak ◽  
Szymon Różański
Keyword(s):  
Calcium Carbonate ◽  
Sequential Analysis ◽  
Nickel Content ◽  
Chemical Properties ◽  
Total Content ◽  
Cement Plant ◽  
Arable Soils ◽  
Positive Correlation ◽  
Ph Values ◽  
Physico Chemical

Abstract The aim of the conducted research was the evaluation of the influence of increased pH on the content and mobility of nickel in arable soils in the surroundings of Małogoszcz Cement Plant. The physico-chemical properties of the investigated soils were determined by the methods commonly used in soil laboratories. The total content of Ni was determined after mineralization in the mixture of HF and HClO4 acids, and the content of forms available for plants, after the extraction with DTPA solution, using ASA method. The investigated soils are characterized as loamy sands or sands (PTG 2008). These soils have the content of C-organic in the range of 10.3.24.2 g·kg-1 in the surface horizons and 8.3.20.3 g·kg-1 in the subsurface horizons. The pH values allow to classify these soils as alkaline. In all of the investigated soils calcium carbonate occurs. The values of total content of nickel were in the range of 1.47.2.82 mg·kg-1 in surface horizons and 1.80.2.45 mg·kg-1 in subsurface horizons, which allows to classify these soils as soil with natural nickel content. The content of Ni-DTPA were in the range of 0.06.0.26 mg·kg.1. The sequential analysis of the obtained results indicates on significant statistically positive correlation between the total content of Ni and C-organic, which has the value of 0.648143 and between the content of Ni-DTPA and the content of fraction with Ø<0.002 mm, with the value of 0.581113 on p=0.05.

scholarly journals Structure and physico-chemical properties of fibrillary collagen fabric modified by silicon dioxide and hyaluronic acid

2020 ◽  
Vol 64 (2) ◽  
pp. 173-185
Author(s):  
A. A. Gaidash ◽  
V. K. Krut’ko ◽  
A. I. Kulak ◽  
O. N. Musskaya ◽  
K. V. Skrotskaya ◽  
...  
Keyword(s):  
Hyaluronic Acid ◽  
Silicon Dioxide ◽  
Calcium Phosphates ◽  
Chemical Properties ◽  
Collagen Fibrils ◽  
Oh Groups ◽  
Laboratory Rats ◽  
Physico Chemical ◽  
Stretching Vibration ◽  
Natural Composites

The connective tissue sheaths of paravertebral tendons (peritenons) of white laboratory rats treated with silicon dioxide and hyaluronic acid were studied. It was found that peritenones are natural composites with orthogonal anisotropy with a developed system of interstitial porous membranes that regulate tissue hydrodynamic flows. The extracellular matrix of peritenons contains carbonate-hydroxyapatite and calcium hydroxide in the amorphized state. Silicon dioxide and hyaluronate form hydrophobic silicate and hyaluronate coatings of collagen fibrils (encapsulation), strengthen bonds in Amides I, II, III, reduce the intensity of the bands of bound hydroxyl and stretching vibration bands of phosphate groups, which indicates the replacement of OH groups with carbonate ions and the suppression synthesis of hydroxyapatite. A key mechanism for reducing the intensity of apatitogenesis is the encapsulation of collagen fibrils, accompanied by screening the centers of epitaxial interactions that are structured during heterogeneous nucleation of calcium phosphates. In SBF biomimetic fluid, the deforming effect of modifying agents is leveled, but hydration and decomposition of fibrillar collagen increase. Moreover, against the background of excess supply of exogenous phosphates and carbonates from SBF, apatitogenesis in peritenons is carried out mainly by the mechanism of homogeneous nucleation.

scholarly journals Assessment of Physico-chemicaal Properties, Antifungal and Anti-sprouting Efficacy of Essential oils (Moringa oleifera and Sesame indicum Oil)

2021 ◽  
Vol 4 (3) ◽  
pp. 59-71
Author(s):  
Abel Y.K. ◽  
Olaleye O.O. ◽  
Ayanda I.S. ◽  
Olasope T.D.
Keyword(s):  
Moringa Oleifera ◽  
Seed Oil ◽  
Chemical Properties ◽  
Seed Oils ◽  
Chemical Parameters ◽  
Ph Values ◽  
Peroxide Values ◽  
Physico Chemical ◽  
Antifungal Potential

This study was aimed at evaluating the physico-chemical properties, antifungal and anti-sprouting efficacy of Moringa oleifera and Sesame indicum seed oil extracts. Physico-chemical parameters were determined and compared for both oils. There was significant (p < 0.05) difference observed between the refractive values (1.4570 and 1.4633), free fatty acid (FFA) (2.04 and 3.21 mg KOHg-1), acid values (6.08 and 6.43 mg KOHg-1), pH values (4.55 and 5.33), saponification values (210.75 and 215.57 mg of KOHg-1), peroxide values (5.40 and 5.80 meqO2/kg), specific gravity (0.8897 to 0.9161 g/cm3) and yield (8.25% and 32.02%) for cold press extracts of Sesame and Moringa seed oils respectively. In vitro antifungal efficacy of both oils (M. oleifera and S. indicum) against Aspergillus niger shows a range of 43.63% to 58.18% inhibition. No anti-sprouting effect was recorded across all concentrations tested for the two oils. However, the antifungal potential of both seed oil extracts (Moringa and Sesame) exhibited moderate inhibitory properties with the highest percentage inhibition at 48 hrs.

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