scholarly journals Physicochemical properties of heat-moisture treated, stearic acid complexed starch: The effect of complexation time and temperature

2021 ◽  
Vol 175 ◽  
pp. 98-107
Author(s):  
Yassaroh Yassaroh ◽  
Albert J.J. Woortman ◽  
Katja Loos
Keyword(s):  
Stearic Acid ◽  
Physicochemical Properties ◽  
Complexation Time

Preparation and characterization of adefovir dipivoxil–stearic acid cocrystal with enhanced physicochemical properties

2017 ◽  
Vol 23 (9) ◽  
pp. 890-899 ◽  
Author(s):  
Jeong-Woong Seo ◽  
Kyu-Min Hwang ◽  
Sung-Hoon Lee ◽  
Dong-Wook Kim ◽  
Eun-Seok Park
Keyword(s):  
Stearic Acid ◽  
Physicochemical Properties ◽  
Adefovir Dipivoxil

Formulation and Physicochemical Evaluation of Topical Preparations Containing Extract of Clerodendrum disparifolium

2014 ◽  
Vol 1060 ◽  
pp. 95-98
Author(s):  
Nawinda Chinatangkul ◽  
Narumol Phosrithong ◽  
Nantana Nuchtavorn ◽  
Teedanai Rattanapit ◽  
Chonnawat Mongkol ◽  
...  
Keyword(s):  
Herbal Medicine ◽  
Stearic Acid ◽  
Physicochemical Properties ◽  
Large Scale ◽  
Physicochemical Characteristics ◽  
Topical Formulations ◽  
Physicochemical Evaluation ◽  
Insect Bites ◽  
Pharmaceutical Production

Clerodendrum disparifolium is a Thai herbal medicine, which is used for the treatment of insect bites and sting reactions by applying finely crushed leaves to the inflamed area. However, this usage is inconvenient. The study aimed to develop gel-and cream-based formulations containing 0.5 %w/v of C. disparifolium extract, and evaluate their physicochemical properties. Different topical formulations were prepared using Carbopol 934 for gels and stearic acid for creams by varying their concentrations. The results showed that gel-based formulation containing Carbopol 934 in the range of 0.5-1.0 %w/w had good appearance, appropriate spreadability (7.30-8.70 cm) and viscosity (33,100-68,920 centipoise (cps)). The pH of gel-based formulation ranged from 6.01 to 6.11. For cream-based formulation containing 10-12 % w/w of stearic acid exhibited good physicochemical characteristics. The spreadability, viscosity and pH were 5.00-5.50 cm, 110,050-174,900 cps and 6.03-6.08, respectively. The results provided the suitable formulations, which should be continuously developed for large-scale pharmaceutical production.

scholarly journals Proximate Composition, Physicochemical Properties and Antioxidant Activity of Flaxseed

2020 ◽  
pp. 1-10
Author(s):  
Omer Adam Omer Ishag ◽  
Ayat A. Khalid ◽  
Amina Abdi ◽  
Ibrahim Yaagoub Erwa ◽  
Awadalla Babiker Omer ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Antioxidant Activity ◽  
Linoleic Acid ◽  
Stearic Acid ◽  
Physicochemical Properties ◽  
Petroleum Ether ◽  
Proximate Composition ◽  
Petroleum Ether Extract ◽  
Flaxseed Oil ◽  
Ether Extract

Aims: The aims of this study were to investigate the proximate composition of flaxseed; physiochemical properties and antioxidant activity of flaxseed. Study Design: Using standard analytical methods to determine the proximate composition of flaxseed, extraction of flaxseed in different trials under the same conditions using two different solvents and investigating their physicochemical properties and antioxidant activity. Place and Duration of Study: This study was conducted in the laboratory of department of applied and industrial chemistry, International University of Africa, University of Medical Sciences and Technology and National Centre for Research, Khartoum – Sudan, during June 2019. Methodology: The prepared sample of flaxseeds was tested for proximate composition and then extracted with petroleum ether and n-hexane. The extracted oil was then subjected to physicochemical analysis, GC-MS analysis and antioxidant activity test. Results: The oil yield of flaxseed was high 21.95% and 28.29% with n-hexane and petroleum ether respectively. The results obtained for proximate composition were: moisture (8.50 ± 0.49%), ash (1.96 ± 0.00%), fiber (20.23 ± 3.47%), protein (21.00 ± 0.74%),fat (43.17 ± 0.99%) and carbohydrate (5.14 ± 2.73%).The physicochemical properties of n-hexane and petroleum ether extracted flaxseed oils were: density (0.92 ± 0.00 g/cm3), refractive index (1.47 ± 0.00 and 1.48 ± 0.01 at 28°C), acid value (0.76 ± 0.10 and 0.75 ± 0.20 mg KOH/g), peroxide value (4.67 ± 1.00 and 2.69 ± 0.55 meq O2/kg), saponification value (185.61 ± 0.56 and 187.83 ± 2.08 mg KOH/g oil), unsaponifiable matter (5.57 ± 0.64 and 2.83 ± 0.23 mg KOH/g oil) and iodine value (97.24 ± 0.86 and 97.44 ± 2.93 g/100 g) respectively. Statistical analysis showed no significant difference between the means of the two data sets of physicochemical properties of flaxseed oils extracted with the two solvents used at 95% confidence level. The GC-MS spectrum of flaxseed oil extracted with n-Hexane revealed presence of 27 fatty acids, the predominant were linoleic acid (46.53%), palmitic acid (18.04%), stearic acid (12.23%), linolenic acid (11.63%) and oleic acid (4.24%). While for petroleum ether extract a total of 28 fatty acids were identified the major were: linolenic acid (42.39%), linoleic acid (26.17%), palmitic acid (12.89%), stearic acid (10.73%) and  methyl erucic (1.24%.). The oils also, showed good antioxidant activity in relation to control; 28 ± 0.09 (DPPH) for n-Hexane extract and 26 ± 0.05 (DPPH) for petroleum ether extract. Conclusion: Based on the results obtained flaxseed and flaxseed oil had good potential for human consumption and can be used for other application.

scholarly journals Solid lipid nanoparticles with stearic acid stabilized with yttrium stearate

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 282-284
Author(s):  
A. D. Shirokikh ◽  
◽  
M. Y. Koroleva ◽  
E. V. Yurtov ◽  
◽  
...  
Keyword(s):  
Stearic Acid ◽  
Physicochemical Properties ◽  
Solid Lipid Nanoparticles ◽  
Nonionic Surfactants ◽  
Lipid Nanoparticles ◽  
Single Particles ◽  
Solid Lipid ◽  
Tween 60 ◽  
Span 60 ◽  
Average Size

In this work, we studied the effect of yttrium stearate on the physicochemical properties of dispersions of solid lipid nanoparticles composed of stearic acid stabilized with nonionic surfactants (Tween 60, Span 60). The results showed that an increase in the concentration of yttrium stearate leads to increasing kinetic stability and decreasing the average size of the aggregates. Along with this, the average size of single particles remains practically unchanged and amounts to 35±5 nm.

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

Studies on the Degradation of Human Fibrinogen by Plasmin and Trypsin

1966 ◽  
Vol 16 (03/04) ◽  
pp. 526-540 ◽  
Author(s):  
E. A Beck ◽  
D. P Jackson
Keyword(s):  
Physicochemical Properties ◽  
Electrophoretic Mobility ◽  
Rapid Loss ◽  
Clotting System ◽  
Human Fibrinogen ◽  
Peptide Bonds ◽  
Physico Chemical ◽  
Starch Gel ◽  
Ph Stat ◽  
Rapid Appearance

SummaryThe effects of trypsin and plasmin on the functional and physicochemical properties of purified human fibrinogen were observed at various stages of proteolysis. Concentrations of plasmin and trypsin that produced fibrinogenolysis at comparable rates as measured in a pH stat produced, at similar rates, loss of precipitability of fibrinogen by heat and ammonium sulphate and alterations in electrophoretic mobility on starch gel. Trypsin produced a more rapid loss of clottability of fibrinogen and a more rapid appearance of inhibitors of the thrombin-fibrinogen clotting system than did plasmin. Consistent differences were noted between the effects of trypsin and plasmin on the immunoelectrophoretic properties of fibrinogen during the early stages of proteolysis.These results are consistent with the hypothesis that trypsin initially reacts with the same peptide bonds of fibrinogen that are split by thrombin, but these same bonds do not appear to be split initially by plasmin. Measurement of the various functional and physico-chemical changes produced by the action of trypsin and plasmin on fibrinogen can be used to recognize various stages of proteolysis.

The effectiveness of granular chalk use for growing winter wheat on grey forest soil

2020 ◽  
pp. 181-191
Author(s):  
M. Tkachenko ◽  
N. Borys ◽  
Ye. Kovalenko
Keyword(s):  
Winter Wheat ◽  
Physicochemical Properties ◽  
Forest Soil ◽  
Active Substance ◽  
Mass Fraction ◽  
Gray Forest Soil ◽  
Mineral Fertilizers ◽  
Acidic Soils ◽  
Grey Forest Soil

The research aims to establish the eff ectiveness of granular chalk use produced by «Slavuta-Calcium» Ltd. under growing Poliska–90 winter wheat variety, changing the physicochemical properties of grey forest soil and the wheat productivity. It also aims to establish optimal dosis of «Slavuta-Calcium» granular chalk as the meliorant and mineral fertilizer for grey forest soil in the system of winter wheat fertilization. In the temporary fi eld studies, various doses of nutrients N60–90–120P30–45–60K60–90–120 combined with «Slavuta–Calcium» granular chalk in a dose of Ca230–460–690 kg/ha of the active substance were studied against the background of secondary plowing of rotation products – soybean biomass that averaged 2.34 t/ha. Granular chalk is a modern complex highly eff ective meliorant with the content of Ca – 37.7 and Mg – 0.2 %, the mass fraction of carbonates (CaCO3 + MgCO3) makes at least 95 %. It is characterized by a high level of solubility when interacting with moisture in soil. It has a form of white granules, the mass fraction of 4.0–6.0 mm in size granules makes not less than 90 % and the one of 1.0 mm in size makes less than 5 %. Reactivity – 97 %. The granular chalk is advisable to apply on acidic soils, as a highly concentrated calcium-magnesium fertilizer, with the former as the dominant fertilizer, to optimize the physicochemical properties of the soil, as well as the plant nutrition system, in particular, increasing the availability of an element for assimilation by plants and as long-term ameliorants. The eff ectiveness of the use of mineral fertilizers, in particular acidic nitrogen on highly and medium acidic soils, after chemical reclamation is increased by 30–50 %, and slightly acidic by 15–20 %. The increase in productivity of crops from the combined eff ects of nutrients and chalk granulated is usually higher than when separately applied. The eff ectiveness of the integrated action of these elements is manifested in the growth of plant productivity and the quality of the resulting products, as well as the optimization of physical chemical properties and soil buff ering in the long term. In order to optimize the physicochemical properties of the arable layer of gray forest soil and the productive nutrition of agricultural crops, winter wheat, in particular, biogenic elements should be used in doses N60-90-120P30-45- 60K60-90-120 with granulated chalk «Slavuta-Calcium» in doses of Ca230-460-690 kg/ha of active substance. Granulated chalk obtained as a result of industrial grinding of solid sedimentary carbonate rocks of natural origin, subsequently under the infl uence of the granulation process of the starting material contains Ca and Mg carbonates of at least 95 %, dense granules which facilitates convenient mechanized application, as well as chalk suitable for accurate metered application on the quest map. Key words: granular chalk, gray forest soil, chemical reclamation, crop productivity.

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