• 제목/요약/키워드: Sodium bicarbonate

검색결과 241건 처리시간 0.037초

Synthesis of Nucleophilic Adducts of Thiols (Ⅶ). Addition of Thioglycolic Acid to $\alpha$-Cyano-$\beta$-phenylacrylic Acid Derivatives

  • Huh, Tae-Sung;Lee, Hee-Jong;Han ,In-Sup;Kim, Tae-Rin
    • Bulletin of the Korean Chemical Society
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    • 제7권1호
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    • pp.23-25
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    • 1986
  • Reaction of ${\alpha}-cyano-{\beta}-phenylacrylic$ acid derivatives (Ⅰ) with thioglycolic acid in the molar ratio of 1:2 in saturated sodium bicarbonate solution yielded 3-(4'-oxo-2'-thiazolin-2'-yl)-2-phenyl-4-oxotetrahydrothiophene derivatives (V). Thioglycolic acid was found to be added not only to carbon-carbon double bond but also to carbon-nitrogen triple bond and those adducts were cyclized to V.

Effects of Addition of Electrolyte and Ascorbic Acid in Feed during Heat Stress in Buffaloes

  • Kumar, B.V. Sunil;Singh, G.;Meur, S.K.
    • Asian-Australasian Journal of Animal Sciences
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    • 제23권7호
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    • pp.880-888
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    • 2010
  • The ameliorative effect of salts and ascorbic acid polyphosphate supplementation on heat stress was studied in buffaloes. Adult buffaloes of either sex were randomly divided into 2 groups of 4 animals each. Group I served as control and Group II was supplemented with sodium bicarbonate, potassium carbonate and ascorbic acid polyphosphate. All the animals were exposed to two conditions of temperature and humidity: hot-dry and hot-humid in a psychrometric chamber for 4 h daily for 10 days. Blood was collected on day 1, 5 and 10 of treatment. The activities of catalase and superoxide dismutase (SOD), concentrations of serum glutathione (GSH), cortisol, sodium, potassium, and chloride and lipid peroxidation were estimated in serum. Lymphocyte proliferation was assessed in blood. The activities of catalase and SOD, serum concentration of GSH, sodium, potassium and chloride decreased while lipid peroxidation and serum cortisol increased in both groups when subjected to heat stress. Dietary supplementation resulted in further decreasing of the enzyme activities but increasing of the serum concentrations of GSH, sodium, potassium and chloride. Lipid peroxidation and serum cortisol increased in the supplemented group in both types of stress. Dietary supplementation caused an increase in lymphoproliferative response to con A. Thus, supplementation of ascorbate in addition to electrolytes relieves the animals of oxidative stress and boosts cell mediated immunity.

A study on Nickel Hydroxide Crystallization for Plating waste Treatment

  • Lee, Chang-Hwan;Lee, Choul-Ho
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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    • pp.292-295
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    • 2001
  • A Study on the precipitation characteristics of nickel hydroxide as well as carbonate and sulfide is carried out to determine the proper treatment condition of the wastewater induced from nickel-plating industry. The nickel concentrations in the effluent could be kept lower than 5ppm when the value of pH was maintained higher than 10. The precipitation of nickel salts by alkaline addition to the nickel containing model wastewater was conducted by using proper amount of sodium hydroxide, sodium carbonate, sodium bicarbonate and sodium sulfide. In case of the sulfide treatment, the residual nickel concentration in the clear water after precipitates removed showed the lowest value. The influences of the precipitation condition upon the particle size of the crystals precipitated were also investigated. In spite of the various precipitation conditions were adopted, the particle size of the precipitated crystals showed no great differences. The sedimentation rates of the precipitated particle bed were observed and the free sedimentation period was terminated within 20 minutes. Although the hindered sedimentation as well as bed compaction progressed subsequently, the bed heights were maintained almost the same level after two hours of sedimentation.

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The Effect of the Pretreatment Print Paste Contents on Colour Yield of an Ink-jet Printed Cotton Fabric

  • Yuen, C.W.M.;Ku, S.K.A.;Choi, P.S.;Kan, C.W.
    • Fibers and Polymers
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    • 제5권2호
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    • pp.117-121
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    • 2004
  • Optimum condition concerning the content of pretreatment print paste and steaming time for ink-jet printing was newly developed through the orthogonal analysis. The cotton fabric treated under the newly developed optimum condition could achieve a high level of colour yield similar to that of the commercially pretreated cotton fabric available in the market for ink-jet printing. The results were discussed thoroughly in this paper.

홍삼의 가열추출 과정중 유기산 중화에 의한 사포닌의 가수분해 억제 (Controls of the Hydrolysis of Ginseng Saponins by Neutralization of Organic Acids in Red Ginseng Extract Preparations)

  • 김천석;최강주
    • Journal of Ginseng Research
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    • 제22권3호
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    • pp.205-210
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    • 1998
  • Glucosidic bonds at the C20 position of the sapogenins were hydrolyzed easily in the lower pH, higher temperatures and longer times to give prosapogenins and sugars. The glucosidic bond of saponin at the C3 of ginsenoside-Rb1, which is secondary carbon, was relatively stable due to the low electron density of -0.2. But the bond of saponin at the C20 position, which is tertiary carbon with the relatively high electron density of -0.3, was liable to be hydrolyzed even in weakly acidic solution by the increase of heating time. On the other hand, red ginseng contained 13.34 mg/g of citric acid, 8.78 mg/g of malonic acid, 3.70 mg/g of oxalic acid, 2.13 mg/g of malic acid and 0.44 mg/g of succinct acid. Ginseng saponins were very stable in ginseng extract neutralized with sodium carbonate or sodium bicarbonate corresponding to the equivalent amount of the total organic acid in the red ginseng.

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Terfenadine-pseudoephedrine HCl의 이중정 및 유핵정의 비교 용출시험 (Comparative Dissolution test of Terfenadine-Pseudoephedrine HCl Double-layered and Core Tablet)

  • 최한곤
    • Journal of Pharmaceutical Investigation
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    • 제27권3호
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    • pp.213-217
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    • 1997
  • The present sustained-release terfenadine-pseudoephedrine HCl dosage form was the core tablet composed of outer (fast-release) layer containing 60 mg of terfenadine and l0mg of pseudoephedrine HCl, and inner (sustained-release) layer containing 110 mg of pseudoephedrine HCl. The purpose of this study was to investigate the possibility of formulating the terfenadine-pseudoephedrine HCl double-layered tablet which was bioequivalent to the core tablet. Its sustained-release and fast-release layer were formulated with disintegrating agents and polymers, respectively, varying with their kinds and amounts. The comparative dissolution test of double-layered and core tablet was carried out at pH 1.2, 4.0 and 6.8, leading to select composite of double-layered tablet whose dissolution pattern was similar to that of core tablet. It was composed of fast-release layer containing 60mg of terfenadine. 10 mg of pseudoephedrine HCl, sodium bicarbonate, microcrystalline cellulose and sodium starch glycolate, and sustained-release layer containing 110 mg of pseudoephedrine HCl and ethylcellulose/hydroxypropyl methylcellulose) (110/30 mg/tablet).

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