scholarly journals Ilościowe oznaczanie skrobi w reakcji z jodem [Quantitative determination of starch in the reaction with iodine]

2015 ◽  
Vol 32 (1) ◽  
pp. 39-52
Author(s):  
Henryk Marciniak
Keyword(s):  
Statistical Analysis ◽  
Quantitative Determination ◽  
Quantitative Method ◽  
Starch Content ◽  
Thick Layer ◽  
Photometric Measurement ◽  
Positive Correlation ◽  
Method Of Determination

A quantitative method of determination by photometric measurement in the iodine-starch complex is described. Determinations were made within 0-250 μg range of starch content in 1 ml of solution. Starch was treated with 0.01N J in 1% KJ and extinction was read at wavelength 610 nm in a 1 cm thick layer of solution, with a "Specol" photocolorimeter. Statistical analysis of measurements showed a positive correlation between the starch amount and extinction.

DC polarographic determination of surfactants

1987 ◽  
Vol 52 (3) ◽  
pp. 609-615
Author(s):  
A. Díaz ◽  
S. González ◽  
A. Arévalo
Keyword(s):  
Quantitative Determination ◽  
Polarographic Determination ◽  
Method Of Determination

The minimum on the polarographic curves for Bi(III) reduction in HCl solutions occurring when small amounts of surfactants are present can be used for their quantitative determination. The form of the polarograms was examined with respect to the concentration of the surfactant, and the range of concentrations in which the method of determination can be used is discussed.

A Method for the Routine Determination of Corn Sirup in Prepared Meat Products

1964 ◽  
Vol 47 (5) ◽  
pp. 903-909
Author(s):  
Lester Hankin ◽  
Alphonse F Wickroski
Keyword(s):  
Statistical Analysis ◽  
Quantitative Determination ◽  
Correction Factor ◽  
Meat Products ◽  
Processed Meat ◽  
Average Amount ◽  
Wide Range ◽  
The Difference

Abstract A method has been devised for the determination of corn sirup added to processed meat products. The method is based on the quantitative determination of dextrin added to corn sirup. The dextrins are enzymatically hydrolyzed by α-amylase and β-amylase, and maltose is calculated as the difference in CuO2 found by copper reduction between a treated and an untreated aliquot. A correction factor was devised to determine the average amount of dextrin in corn sirup by testing a number of commercial sirups for their dextrin content and subjecting the data to statistical analysis. With this equation the method is applicable to a wide range of sirups. The method also permits the estimation of dextrose added to meats in excess of that included as one of the components of corn sirup.

Quantitative Determination of Cadmium in Water-Soluble Color Additives by Atomic Absorption Spectroscopy

1972 ◽  
Vol 55 (5) ◽  
pp. 1145-1149
Author(s):  
Lueangier Moten
Keyword(s):  
Aqueous Solutions ◽  
Quantitative Determination ◽  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Quantitative Method ◽  
Water Soluble ◽  
Low Levels ◽  
Absorption Measurements

Abstract A quantitative method is presented for the determination of cadmium at low levels (5–20 ppm) in water-soluble color additives by atomic absorption spectroscopy. Absorption measurements were made on aqueous solutions of typical color additives to which known amounts of cadmium had been added. The method requires no pretreatment of sample and should be applicable to all water-soluble color additives.

RP-LC Method for the Simultaneous Determination of Gliquidone, Pioglitazone Hydrochloride, and Atorvastatin in Formulations and Human Serum

2013 ◽  
Vol 96 (1) ◽  
pp. 56-59 ◽  
Author(s):  
Agha Zeeshan Mirza ◽  
M Saeed Arayne ◽  
Najma Sultana
Keyword(s):  
Phosphoric Acid ◽  
Quantitative Determination ◽  
Human Serum ◽  
Flow Rate ◽  
Drug Combination ◽  
Mobile Phase ◽  
Quantitative Method ◽  
Hplc Method ◽  
Established Method

Abstract The objective of this research was to develop and validate a rapid, economical, and sensitive HPLC method for quantitative determination of gliquidone, pioglitazone hydrochloride, and atorvastatin in tablets and serum. Due to drug combination of these formulations, there has been a need for a reliable quantitative method to determine these drugs in commercial samples and human serum. The chromatographic separation was carried out at ambient temperature with a mobile phase consisting of methanol–water (90 + 10, v/v), with pH adjusted to 3.50 with phosphoric acid. The pump was operated at a flow rate of 1 mL/min, and all analytes were detected at 235 nm. The method was linear over the concentration range of 5–50 μg/mL for all the drugs. The LOD of gliquidone, pioglitazone hydrochloride, and atorvastatin was 0.30, 1.30, and 0.57 μg/mL and LOQ was 0.98, 4.28, and 1.90 μg/mL, respectively. The proposed method was successfully applied to the determination of these drugs in commercial tablets and human serum. The established method was validated with respect to specificity, linearity, precision, accuracy, and ruggedness.

Comparison of Four Thin-Layer Chromatographic Methods for the Determination of Aflatoxins in Raisins

1988 ◽  
Vol 71 (2) ◽  
pp. 280-282
Author(s):  
Dilek Boyacioglu ◽  
Meral Gonul
Keyword(s):  
Statistical Analysis ◽  
Thin Layer ◽  
Quantitative Method ◽  
Chromatographic Methods ◽  
Accuracy And Precision ◽  
Coefficients Of Variation ◽  
Aflatoxin B

Abstract A study was conducted to determine the accuracy and precision of 3 AOAC methods, sees 26.026-26.031 (CB), sees 26.032-26.036 (BF), and sees 26.052-26.060 (cottonseed), and the Romer quantitative method for the thin-layer chromatographic (TLC) determination of aflatoxins B„ B2, G„ and G2 in raisins. The samples were spiked at a level of 10 Mg total aflatoxins/kg. The TLC development systems were: ether-methanol-water (94 + 4.5 + 1.5) and chloroform-acetone (9 + 1). The interaction between the 4 methods and the 2 development systems was also studied. The average recoveries were 88, 80, 75, and 93% with coefficients of variation of 14.0,10.4,14.0, and 9.6% for aflatoxin B, using the CB, BF, cottonseed, and Romer methods, respectively. Statistical analysis showed no difference in the results obtained using the 2 TLC development systems

Rapid Method for the Quantitative Determination of Serum Alkaline Phosphatase

1960 ◽  
Vol 6 (3) ◽  
pp. 269-275 ◽  
Author(s):  
Bernard klein ◽  
Prunella A Read ◽  
Arthur L Babson
Keyword(s):  
Alkaline Phosphatase ◽  
Quantitative Determination ◽  
Rapid Method ◽  
Quantitative Measurement ◽  
Serum Alkaline Phosphatase ◽  
Photometric Measurement

Abstract A new procedure is described for the simple, rapid, quantitative measurement of serum alkaline phosphatase. The procedure is based on the direct photometric measurement of phenolphthalein released from sodium phenolphthalein phosphate. The substrate is available in a convenient, stabilized form as a tablet containing buffer and substrate in optimum amounts for a single analysis. As many as 30 analyses can be performed in an hour.

scholarly journals Antioxidant activity and flavonoid content of Clusia fluminensis Planch. & Triana

2012 ◽  
Vol 84 (3) ◽  
pp. 609-616 ◽  
Author(s):  
Maria Carolina A. da Silva ◽  
Selma R. Paiva
Keyword(s):  
Antioxidant Activity ◽  
Statistical Analysis ◽  
Free Radical ◽  
Native Species ◽  
High Luminosity ◽  
Water Restriction ◽  
Flavonoid Content ◽  
Stable Free Radical ◽  
Positive Correlation

Clusia fluminensis Planch. & Triana (Clusiaceae Lindl.) is a native species found in regions of high luminosity and water restriction. The aim of this study was to evaluate the antioxidant activity of Clusia fluminensis crude extracts through the scavenging of the stable free radical DPPH, and the determination of flavones and flavonols content in these extracts. The fruit acetonic extract showed the lowest EC50 value (2.71 ± 0.34 g extract / g DPPH), the lowest percentage of remaining DPPH at the concentrations of 125 and 250 µg/mL (about 4% in both), and also the greatest percentage of flavones and flavonols (13.93 ± 0.21 %). Statistical analysis suggests a positive correlation between the presence of flavonoids and the antioxidant activity of this extract. From the obtained results it can be inferred that the acetonic extract of C. fluminensis fruits is an interesting target for the search of substances with antioxidant activity, especially flavonoids.

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