Evaluation of an Acetic Acid—Sulphuric Acid Method for Quantitative Determination of Cholesterol in Serum

1954 ◽  
Vol 6 (1) ◽  
pp. 60-64
Author(s):  
V. Fürst ◽  
R. I. Ange
Keyword(s):  
Acetic Acid ◽  
Quantitative Determination ◽  
Sulphuric Acid ◽  
Acid Method

scholarly journals Method for Estimation of Calcium Carbonate in Soils from Iraq

2013 ◽  
Vol 1 (1) ◽  
pp. 9-19 ◽  
Author(s):  
Jabbar K Kassim
Keyword(s):  
Acetic Acid ◽  
Calcium Carbonate ◽  
Quantitative Determination ◽  
Carbonate Content ◽  
Acid Neutralization ◽  
Calcium Carbonates ◽  
Acid Method ◽  
Proton Adsorption ◽  
Soil Carbonates

Attempts have been made to evaluate four methods of quantitative determination of soil carbonates. Calcium carbonates equivalent were determined by the acid neutralization, calcimeter and acetic acid methods. Also, it obtains by the fourth methods when the acid neutralization method is corrected against proton adsorption. The acid neutralization method gave significantly higher estimates of total carbonates and different from each of the others. The calcimeter method gave the lower estimates of CaCO3 equivalent. The results showed that the corrected values of CaCO3 equivalent did not differ significantly from other three methods but the overall mean tended to be higher than the acetic acid and calcimeter methods. It may be concluded that the acetic acid method is simple, can reasonably estimate the carbonate content and requires only a pH meter. It can be used for routine determination of soil carbonate. DOI: http://dx.doi.org/10.3126/ije.v1i1.8524   International Journal of Environment Vol.1(1) 2013: 9-19

QUANTITATIVE DETERMINATION OF CURCUMIN IN TURMERIC POWDER AND TURMERIC–HONEY BALL PILLS BY HPLC

2018 ◽  
Vol 8 (4) ◽  
pp. 42-47
Author(s):  
Tien Nguyen Huu ◽  
Tram Le Thi Bao ◽  
Ngoc Nguyen Thi Nhu ◽  
Thang Phan Phuoc ◽  
Khan Nguyen Viet
Keyword(s):  
Acetic Acid ◽  
Gastric Mucosa ◽  
Quantitative Determination ◽  
Mobile Phase ◽  
Curcuma Longa ◽  
Biological Marker ◽  
Hplc Method ◽  
Chromatography Analysis ◽  
Precision And Accuracy

Background: Curcumin is a major ingredient in turmeric (Curcuma longa L., Zingiberaceae), which has important activities such as anti-tumor, anti-inflammatory, antioxidant, anti-ischemia, protection of gastric mucosa etc,. Curcumin can be considered as a biological marker of turmeric and turmeric products. Objectives: Developing an HPLC method for quantification of curcumin in turmeric powder and turmeric - honey ball pills; applying this method for products on the market. Materials and methods: turmeric powder and turmeric - honey ball pills collected in Thua Thien Hue province. After optimization process, the method was validated and applied to evaluate the content of curcumin. Results: The chromatography analysis was performed with: Zorbaz Eclipse XDB-C18 (150 × 4.6 nm; 5 µm); Mobile phase: acetonitril: 2% acetic acid (45:55), Flow rate was kept constant at 1.0 ml/min; Detector PDA (420 nm). The method was validated for the HPLC system compatibility, specificity, linearity range, precision and accuracy; the recovery greater than 98%. Conclusion: The developed HPLC method can determine curcumin in turmeric powder and turmeric - honey ball pills. Key words: Curcumin, turmeric powder, turmeric-honey ball pills, quantitative determination, HPLC

Determination of Carbaryl Residues in Honey Bees

1965 ◽  
Vol 48 (4) ◽  
pp. 771-774
Author(s):  
D P Johnson ◽  
H A Stansbury
Keyword(s):  
Aqueous Solution ◽  
Acetic Acid ◽  
Quantitative Determination ◽  
Honey Bees ◽  
Methylene Chloride ◽  
Hydrolysis Product ◽  
Separate Analysis ◽  
Yellow Substance ◽  
Hydrolysis Of

Abstract A method has been developed for detecting residues of carbaryl (1-naphthyl methylcarbamate) as well as its hydrolysis product, 1-naphthol, in dead bees. The method is based on extraction of the bees with benzene, followed by a cleanup involving liquid partitioning and chromatography on Florisil. The quantitative determination involves hydrolysis of carbaryl to 1-naphthol and coupling of the latter with p-nitrobenzenediazonium fluoborate in acetic acid to form a yellow substance. For separate analysis, free 1-naphthol is separated from methylene chloride into a basic aqueous solution. The sensitivity of the method is about 0.1 ppm; recoveries averaged 85.6 ± 6.6% for 1- naphthol and 83.8 ± 2.7% for carbaryl.

THE DETERMINATION OF ZIRCONIUM WITH BENZOYLPHENYLHYDROXYLAMINE

1960 ◽  
Vol 38 (12) ◽  
pp. 2488-2492 ◽  
Author(s):  
D. E. Ryan
Keyword(s):  
Hydrochloric Acid ◽  
Quantitative Determination ◽  
Sulphuric Acid ◽  
Rare Earths ◽  
Acid Solutions ◽  
Constant Composition ◽  
Hydrochloric Acid Solutions

Zirconium is completely precipitated by benzoylphenylhydroxylamine from 0.5 N acid solutions. The complex formed in sulphuric acid solutions has a constant composition, Zr(C13H10O2N)4, and is used for the direct weighing of zirconium; the factor is 0.0970. The product precipitated from hydrochloric acid solutions must be ignited to the oxide. The reaction is sensitive, 1 p.p.m. of zirconium being detectable, and quantitative determination of 0.2 mg is possible. Thorium and the rare earths do not interfere.

Phosdrin Residues in Fruits and Vegetables

1964 ◽  
Vol 47 (2) ◽  
pp. 272-280
Author(s):  
N Bluman
Keyword(s):  
Acetic Acid ◽  
Quantitative Determination ◽  
Enzyme Inhibition ◽  
Fruits And Vegetables ◽  
Acetylcholinesterase Inhibition ◽  
Spectrophotometric Procedure ◽  
Ferric Salt ◽  
Organic Impurities ◽  
The Mean

Abstract The enzyme inhibition-spectrophotometric procedure for Phosdrin residues submitted by the manufacturer has been slightly modified and studied collaboratively on apples, tomatoes, and cabbages. This method is based on the ability of Phosdrin to inhibit cholinesterase. Phosdrin is extracted from crops with chloroform, transferred into water, purified to remove organic impurities, and determined quantitatively by the acetylcholinesterase inhibition procedure. The uninhibited cholinesterase hydrolyzes acetylcholine to acetic acid and choline. The acetylcholine not hydrolyzed is reacted with alkaline hydroxylamine and a ferric salt to form a red complex, the absorbance of which is measured spectrophotometrically at 540 mμ. The recoveries at the 0.164 and 0.328 ppm levels of addition ranged from 73.2 to 109.8% for apples, 70.1 to 111.0% for tomatoes, and 68.9 to 117.0% for cabbages. The mean recoveries for apples, tomatoes, arid cabbages were 95.9, 94.9, and 91.6%, respectively; the over-all recovery was 94.1%. The method is recommended as official, first action for quantitative determination of Phosdrin residues in fruits and vegetables.

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