The Effect of Extraction Condition on The Polyphenol Content and Antioxidant Activity of Curcuma zedoaria (Christm.) Roscoe Rhizome

White turmeric (Curcuma zedoaria (Christm.) Roscoe) is one of Indonesian herbal medicine. The extraction process to get active compound was influenced by some factor such as solvent, temperature, time, and method of extraction. The objective of this study was to determine the significant factor of extraction that is solvent, temperature and time of extraction on the polyphenol content and antioxidant activity of white turmeric (Curcuma zedoaria (Christm.) Roscoe) rhizome. Extraction was done by dynamic maceration method with variations (23 factor variable design) of solvent (ethanol 95% and water), temperature (25°C and 70°C), time (6 and 24 hours). The method of analysis of polyphenol content using Folin Ciocalteu reagent, and the antioxidant activity using DPPH free radical reduction method. The experiment design and data analysis using software Design Expert ver.10. The result showed that extraction using ethanol 95% at 70°C for 24 hours was gave high polyphenol content and antioxidant activity. Data analysis was showed that polyphenol content and antioxidant activity was influenced only by solvent of extraction. This study indicated that solvent is significant extraction factor for polyphenol content and antioxidant activity of white turmeric (Curcuma zedoaria (Christm.) Roscoe) rhizome. Keywords: Antioxidant, Curcuma zedoaria (Christm.) Roscoe, extraction, polyphenol

INVESTIGATION OF KINETIC COEFFICIENTS OF ELECTRIC HYPERFILTRATION EXTRACTION OF CHEMICAL SUBSTANCES FROM ANILINE-CONTAINING MANUFACTURING PROCESS SOLUTIONS

The data on extraction factor; hindrance factor and solvent specific flow value during electric hyperfiltration extraction of substances from aniline-containing manufacturing process solutions are obtained in this study. The interpretation of experimental materials (extraction factor; hindrance factor and solvent specific flow) in a dependence on current density; concentration; nature of dissolved substance and semipermeable membrane type is presented as well. It was established that extraction factor and hindrance factor for aniline-containing substances is increased due to the growth of current density and sulfuric acid concentration. Solvent specific flow value is increased under current density elevation; but it is decreased in response to concentration growth. The treatment of aniline-water solution with sulfuric acid results in hindrance factor increasing with the growth of sulfuric acid concentration in aniline-water solution on MGA-100 and OPM-K membranes which is explained by pH reduction of solution. Besides; dissociation degree and solubility of weak bases such as aniline elevate; Gibbs energy common value is decreased under absorption; which leads to reduction of aniline sorption by membranes. The presence of sulfuric acid in aniline-water solution brings about the formation of more complex space structures. These substances are retained by membrane better due to its higher dissociation degree; better water solubility; larger molecular size and more branched structure. The increasing in sodium chloride and sodium sulfate concentrations results in the decrease in its hindrance factors and solvent specific flow value through semipermeable membranes of MGA-100 and OPM-K types.Forcitation:Lazarev S.I.; Lazarev К.S.; Kovaleva О.А.; Каzakov V.G.; Strelnikov А.Е. Investigation of kinetic coefficients of electric hyperfiltration extraction of chemical substances from aniline-containing manufacturing process solutions. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 5. P. 74-80

THE ISSUE OF APPLICATION OF PHYSICAL AND CHEMICAL TECHNOLOGIES IN THE DEVELOPMENT OF OIL AND GAS FIELDS

The efficiency of different physical and chemical technologies used in various areas and Romashkinskoye New-Elkhovskoye oil fields was researched. The result was a conclusion that at high water-cut objects, restriction of movement of water in highly permeable leached zones of a productive layer is one of the main conditions for increasing the efficiency of not only flooding, but also the use of physical and chemical methods based on improving of oil extraction factor.

Extraction Factor Of Pure Ammonium Paratungstate From Tungsten Scraps

Typical oxidation process of tungsten scraps was modified by the rotary kiln with oxygen burner to increase the oxidation rate of tungsten scraps. Also to accelerate the solubility of solid oxidized products, the hydrothermal reflux method was adapted. By heating tungsten scraps in rotary kiln with oxygen burner at around 900° for 2hrs, the scraps was oxidized completely. Then oxidized products (WO3 and CoWO4) was fully dissolved in the solution of NaOH by hydrothermal reflux method at 150° for 2hrs. The dissolution rate of oxidized products was increased with increasing the reaction temperature and concentration of NaOH. And then CaWO4 and H2WO4 could be generated from the aqueous sodium tungstate solution. Ammonium paratungstate (APT) also could be produced from tungstic acid using by aqueous ammonium solution. The morphologies (cubic and plate types) of APT was controlled by the stirring process of purified solution of ammonium paratungstate.