Direct Titration

2019 ◽  
Author(s):  
Maria F. Camões ◽  
Gary D. Christian ◽  
David Brynn Hibbert
Keyword(s):  
Direct Titration

Adaptation of the AOAC Fluorine Method for Determining Fluoride in Fish Protein Concentrate

1970 ◽  
Vol 53 (1) ◽  
pp. 3-6
Author(s):  
R. Bruce Klemm ◽  
Mary E. Ambrose Klemm
Keyword(s):  
Steam Distillation ◽  
Silica Sand ◽  
Official Method ◽  
Protein Concentrate ◽  
Fish Protein ◽  
Direct Titration ◽  
Modified Method ◽  
Aoac Official ◽  
Aoac Official Method

Abstract The AOAC official method, 24.029–24.035, for the determination of fluorine in foods was modified slightly to o btain quantitative recoveries of fluorine from samples of fish protein concentrate (FPC). The most important alterations include the use of steam distillation, the addition of finely ground silica sand in the distillation, a decrease in the distillation temperature, and the utilization of direct titration. Recoveries of fluoride added to FPC before ashing, using this modified method, averaged 96.0 ± 3.0%. Our results are in agreement with those of several other analysts who used a variety of methods.

Use of tetravalent manganese in solutions of sulfuric acid as an oxidant for the direct titration of nitrite

1986 ◽  
Vol 33 (3) ◽  
pp. 376-378
Author(s):  
U. Muralikrishna ◽  
K. Subrahmanyam ◽  
Mannam Krishnamurthy
Keyword(s):  
Sulfuric Acid ◽  
Direct Titration

Microdetermination of?-amino-acids by direct titration with copper(II) sulphate solution

1974 ◽  
Vol 62 (6) ◽  
pp. 1003-1008 ◽  
Author(s):  
Y. A. Gawargious ◽  
Amir Besada ◽  
M. E. M. Hassouna
Keyword(s):  
Amino Acids ◽  
Sulphate Solution ◽  
Direct Titration

Quantitative determination of acidic groups in functionalized graphene by direct titration

2016 ◽  
Vol 103 ◽  
pp. 44-53 ◽  
Author(s):  
Jakub Ederer ◽  
Pavel Janoš ◽  
Petra Ecorchard ◽  
Václav Štengl ◽  
Zuzana Bělčická ◽  
...  
Keyword(s):  
Quantitative Determination ◽  
Functionalized Graphene ◽  
Direct Titration

scholarly journals Malaria serology: performance of six Plasmodium falciparum antigen extracts and of three ways of determining serum titers in IgG and IgM-ELISA

1993 ◽  
Vol 35 (6) ◽  
pp. 495-502 ◽  
Author(s):  
Maria Carmen Arroyo Sanchez ◽  
Sandra do Lago Moraes de Avila ◽  
Vera de Paula Quartier-Oliveira ◽  
Antonio Walter Ferreira
Keyword(s):  
Plasmodium Falciparum ◽  
Malaria Diagnosis ◽  
Sodium Deoxycholate ◽  
Epidemiological Studies ◽  
Negative Control ◽  
Igg Antibody ◽  
Direct Titration ◽  
Antibody Titers ◽  
Constant Slope ◽  
Better Than

The study evaluated six Plasmodium falciparum antigen extracts to be used in the IgG and IgM enzyme-linked immunosorbent assays (ELISA), for malaria diagnosis and epidemiological studies. Results obtained with eighteen positive and nine negative control sera indicated that there were statistically significant differences among these antigen extracts (Multifactor ANOVA, p< 0.0001). Urea, sodium deoxycholate and Zwittergent antigen extracts performed better than did the three others, their features being very similar for the detection of IgG antibodies. Urea, alkaline and sodium deoxycholate antigen extracts proved to be better than the others for the detection of IgM antibodies. A straight line relationship was found between the optical densities (or their respective log 10) and the log 10 of antibody dilutions, with a very constant slope. Thus serum titers could be determined by direct titration and by two different equations, needing only one serum dilution. For IgM antibody detections, log 10 expression gave results that better correlated with direct titration (95% Bonferroni). For IgG antibody detections, the titer differences were not significant. The reproducibility of antibody titers and antigen batches was also evaluated, giving satisfactory results.

scholarly journals Binding of Calcium to Fibrinogen: Some Related Properties

1977 ◽  
Author(s):  
G. Marguerie
Keyword(s):  
Binding Sites ◽  
Calcium Binding ◽  
Specific Binding ◽  
Equilibrium Dialysis ◽  
Structural Features ◽  
Salt Bridges ◽  
High Affinity ◽  
Direct Titration ◽  
Specific Binding Sites ◽  
Calcium Binding Sites

The calcium binding properties of bovin fibrinogen have been studied using equilibrium dialysis method. At pH 7.5 fibrinogen has 3 specific calcium binding sites of high affinity and several non specific binding sites of low affinity. Direct titration of the calcium induced proton release indicates that the binding center is a chelate. Thermal an acid denaturation is found to be markedly influenced by the presence of Ca++, suggesting that structural features are related to the binding. However the circular dichroism spectra show that no generalized conformational change is induced when Ca++ is bound to the protein.The plasminic digestion of fibrinogen is also found to be specificaly influenced by Ca++. The velocity of the initial cleavages is slightly reduced in the presence of calcium. It is therefore suggested that the C-terminal part of the Aα chain is involved in the binding.Considering the dimeric structure of the fibrinogen molecule, the presence of only 3 calcium binding sites of high affinity suggests the existence of “salt bridges” between the constitutive polypeptide chains.

Analysis of Sodium Diphenylhydantoin and Phenobarbital Combinations by Nonaqueous Titration

1968 ◽  
Vol 51 (5) ◽  
pp. 1013-1016
Author(s):  
Sura J P Agarwal ◽  
Martin I Blake
Keyword(s):  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Ammonium Hydroxide ◽  
Butyl Alcohol ◽  
Dosage Forms ◽  
Direct Titration ◽  
Titration Procedure ◽  
Tert Butyl Alcohol ◽  
Preliminary Separation

Abstract A simple, nonaqueous titration procedure is described for the determination of sodium diphenylhydantoin and phenobarbital combinations. Preliminary separation of the components is unnecessary. The phenobarbital content is determined by direct titration in tert.-butyl alcohol, using sodium methoxide or triethyl n-butyl ammonium hydroxide as the titrant. The total acidity is determined by titration of the sample after passage through a cation exchange resin (Amberlite IRC-50). The sodium diphenylhydantoin content is obtained by difference. Quantitative recoveries were obtained for synthetic mixtures and commercially available dosage forms

Direct Titration of Epoxy Compounds and Aziridines

1968 ◽  
pp. 238-241
Author(s):  
R.R. JAY
Keyword(s):  
Direct Titration

Direct titration of vanadium(IV) with EDTA using N-benzoyl-N-phenylhydroxylamine as metal indicator

1962 ◽  
Vol 27 ◽  
pp. 594-596 ◽  
Author(s):  
V.R.M. Kaimal ◽  
S.C. Shome
Keyword(s):  
Direct Titration
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