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Register a new userSynthesis of dodecanoate sodium alginate and study its properties as a carrier of ibuprofen
اصطناع دوديكانوات ألجينات الصوديوم و دراسة خصائصها كمادة حاملة للأيبوبروفن
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تم اصطناع مركبين هما: رباعي بوتيل أمونيوم الألجينات و الأستر دوديكانوات ألجينات الصوديوم تم اصطناع المركب الأول انطلاقا من ألجينات الصوديوم و ذلك بتحويل ألجينات الصوديوم إلى حمض الألجينيك ثم تعديله بهيدروكسيد رباعي بوتيل أمونيوم، كما تم اصطناع الاستر انطلاقا من رباعي بوتيل أمونيوم الألجينات وفق تفاعل فيشر بتفاعل رباعي بوتيل أمونيوم الألجينات مع حمض الدوديكانويك باستخدام (Amberlyst-15) كحفاز حمضي غير متجانس، ثم مفاعلة الناتج مع كربونات الصوديوم.
Tow compounds have been synthesised: tetra butyl ammonium alginate and dodecanoate sodium alginate ester. The synthesis of compound (1) by transferring sodium alginate to Alginic acid and then adjusted by tetra-butyl ammonium hydroxide. The compound (2) was synthesised from tetra-butyl ammonium alginate according to Fisherest erification, between tetra-butylammonium alginate and dodecanoic acid and using (Amberlyst-15) as a hetrogeneous acid catalyst, and then the product react with sodium carbonate.
References used
PELLETIER. S, HUBRT. P, LAPICQUE. F, PAYAN. E, DELLACHERIE. E (2000) Amphiphilic derivatives of sodium alginate and hyaluronate: synthesis and hysicochemical properties of aqueous dilute solutions, Carbohydrate Polymers, 43, 343-349
HAY. I. D, UR REHMAN. Z, GHAFOOR. A, REHM. B. H. A (2010) Bacterial biosynthesisof alginates, Journal of Chemical Technology & Biotechnology , 85, 752–759
MOE. S, BRAEK. G, SMIDSROD. O (1991) Covalently crosslinked sodium alginate beads, Food Hydrocolloid,5,119-23
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The evolution of Polymers which are produced by the binding of many
structural units, i.e. monomers in series, has led to one of the most important
revolution in the twentieth century. Besides their resistive and plastic
properties which match tho
se of metals, they are better than those in many
characteristics as they are lighter, cheaper and above all easier to manufacture.
Polymers are in every day life usage, starting from consumptional commedities
(containors) through the most developed applications such as in space sectors
and space navigation, and as molecular lock –and- key elements in medicine
and chemical reaction activation and filtering, in addition to their use in
intercalation chemistry and in biological sensors, biocompatibility and organic
transistors among others.
The current research aims to study the effect of chemical disinfectants
on the roughness and hardness of the surface of the cobalt chrome
alloy, where the use of cleansing Sodium hypochlorite 5.25%
and distilled water (the control sample), Been ma
nufacturing 20
structure metal of the alloy cobalt chrome, each group containing 10
samples and was doused with samples intravenously cleared, then it
was measured surface roughness using an Atomic force microscope, and
measuring the hardness of the surface using a Vickers measuring device
hardness.
The study aims to investigate the efficacy of subcutaneous Betamethasone phosphate sodium injection in the treatment of chalazion. The research was carried out in Al-Assad Hospital, Tishreen University, Lattakia, in the period from January 2009 to De
cember 2010.
The study included 30 patients; their age ranged between 1-54 years. The patients had chalazion treated with an injection (0.2ml) of Betamethasone phosphate sodium in the subcutaneous tissue around the lesion. All injections were given by a single ophthalmologist. No local or topical anaesthetic was used. The patients were monitored after 2 weeks. The injection (half of the first dose 0.1ml) was repeated when the chalazion did not reduce, with a maximum of two more injections given over a 2-week interval.
Thirty patients with chalazion were followed up and treated with injection of Betamethasone phosphate sodium into the subcutaneous tissue around the lesion. In 27 patients (90%), the lesion subsided completely. 16 patients (53.3%) had lesions that subsided with one injection. 11 patients (36.7%) had lesions that subsided after the second injection. 3 patients (10%) did not respond to the treatment. The size and duration of the chalazion up till the time of the patients’ visit to the clinic did not significantly affect the outcome of the treatment. Two patients developed depigmentation of the skin at the site of injection. No other major complications were encountered.
Subcutaneous injection of the Betamethasone phosphate sodium appears to be a simple and effective treatment for chalazion. Further comparative clinical cases are indicated
A lubricant (Lithium-Sodium) of Syrian petroleum-based stocks and
thickener material depends in its preparation on Skinless chicken fat, was
manufactured at different ratios.
A study of physical - chemical properties of manufactured grease types w
as
carried out (compared with Syrian standard specification 791/2008) by using
standard methods which included: grease state, penetration degree, drop point,
free acidity (as oleic acid)% by weight, grease resistence to water, evaporating
at 90° C, and corrosion of copper plate. Where the results show that the best
type of grease is of 30% ratio.
In this research, we studied the quantum effect of the electronic
density change effect of some sodium( Nan) clusters properties,
electronic and spectral properties changes.We have been studied
using density functional theory: (DFT/B3LYP(6-311+G(2d))).
Density Functional Theory (DFT) is a computational method that
derives properties of The sodium clusters (neutral and positively)
based on a determination of the electron density of the clusters.
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