Studying the Thermodynamic Properties of Succinic Acids in a Binary Mixture of Water and Tetrahydrofuran

In This Research Studied The solubility of Succinic acid in water + THF mixtures by astatic analytical technique using the acid–base titration method at temperatures ranging from 298.15 to 333.15 K and atmospheric pressure.

Synthesis of dodecanoate sodium alginate and study its properties as a carrier of ibuprofen

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.

A study of the most important physical, chemical and microbial changes in infant milk during consumption and storage at room or refrigerator temperature

The aim of this research is to study the most important physical, chemical and microbial changes in several kinds of infant milk available in local markets. The milk samples were studied in conditions similar to those used by mothers when they prepare infant milk bottles at their houses. The results showed that moisture content increased in all samples from approximately 1% to 3.2-4.4% after storage for 9 days. Acidity increased considerably from 0.14% to 0.2%. The results showed that peroxide value passed the allowable limits (0.25) and reached about (0.47) in samples stored for 9 days at room temperature. However, the value for samples stored in the refrigerator ranged between (0.25-0.29). The free acidity number of fat for all samples specially the refrigerated ones was within the natural limits (<0.5). Chromatographic analyses showed apparent differences in fatty acid percentages between the kinds of milk. The rate of lenoleic acid (C 18-2 ) decreased during storage in all samples and in all conditions. Soluble nitrogen increased in all samples at the end of storage and the highest value was 0.49% in Nido milk samples. The solubility of milk samples was checked during storage and was found to decrease very little ( 1%). The total count of aerobic bacteria showed that all samples conform to the Syrian standards (No. 197, 1996) during the first six days of storage, but they passed the upper limits at the end of storage. However, all samples were free of pathogenic microbes .

Study of the Relative Agronomic Effectiveness of a Syrian Phosphate Rock, and the Effect of Mixing with Different Ratios of Elemental Sulfur

A pot experiment was conducted to evaluate the relative agronomic effectiveness (RAE%) of a Syrian phosphate rock when it is added alone and as mixture with elemental sulfur with three different ratios (PR:S) (2:1) (5:1) (8:1) and compared with triple superphosphate. The main results of this study showed that Ain Layloun phosphate rock was not effective for direct use by Rye grass when used alone, but it became effective when mixed with elemental sulfur. The relative agronomic effectiveness was varied following mixing ratios, it was 50%, 76% and 87% in (8:1), (5:1) and (2:1) (PR:S) mixing ratios respectively. This is due to the increase of available soil phosphorus content which is related to the increase of phosphate rock solubility due to decrease of pH derived from oxidation of sulfur by Thiobacillus spp.