scholarly journals Infrared spectrophotometric determination of sodium lauryl sulfate by the use of high molecular weight amine

1967 ◽  
Vol 16 (3) ◽  
pp. 255-257 ◽  
Author(s):  
Naobumi OI ◽  
Eiji INABA
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Spectrophotometric Determination ◽  
Sodium Lauryl Sulfate ◽  
Lauryl Sulfate

Corneal Protection With High-Molecular-Weight Hyaluronan Against In Vitro and In Vivo Sodium Lauryl Sulfate-Induced Toxic Effects

Cornea ◽  
2009 ◽  
Vol 28 (9) ◽  
pp. 1032-1041 ◽  
Author(s):  
Thierry Pauloin ◽  
Mélody Dutot ◽  
Hong Liang ◽  
Emilie Chavinier ◽  
Jean-Michel Warnet ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Sodium Lauryl Sulfate ◽  
Toxic Effects ◽  
Lauryl Sulfate

scholarly journals Extraction and spectrophotometric determination of Hg2+ as complex anion HgI3-

1997 ◽  
Vol 22 (0) ◽  
pp. 09-14 ◽  
Author(s):  
Zaida FERNÁNDEZ TERRA ◽  
Rubén DEL TÓRO DÉNIZ ◽  
Humberto VARELA DE MOYA
Keyword(s):  
Molecular Weight ◽  
Metal Complex ◽  
High Molecular Weight ◽  
Spectrophotometric Determination ◽  
Quaternary Ammonium ◽  
Complex Anion ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Beer’S Law

A method has been developed for the extraction and spectrophotometric determination of Hg2+ in a concentration range of 0.2-1.0 mg L-1; following the Lambert-Beer's law using high molecular weight quaternary ammonium salts dissolved in chloroform. The metal complex anion was determined in the extract in the region UV (260 nm).

Sodium Lauryl Sulfate in Egg Whites

1967 ◽  
Vol 50 (4) ◽  
pp. 847-849
Author(s):  
John Wiskerchen
Keyword(s):  
Chloride Solution ◽  
Sodium Lauryl Sulfate ◽  
Collaborative Study ◽  
Egg White ◽  
Chloride Complex ◽  
Bromphenol Blue ◽  
Lauryl Sulfate ◽  
Benzethonium Chloride ◽  
Alkyl Sulfates

Abstract A method is given for the quantitative determination of sodium lauryl sulfate in liquid, frozen, powdered, or flake-dried egg white. The egg white is dissolved in water and the protein is precipitated with ethanol and filtered off. The filtrate is evaporated, the residue is dissolved in water, and the pH is adjusted to 5.0. Total alkyl sulfates are titrated with standard benzethonium chloride solution in the presence of chloroform with bromphenol blue indicator. Results are calculated as sodium lauryl sulfate. The formation of the bromphenol bluebenzethonium chloride complex, when excess benzethonium chloride is present, is taken as the end point. The blue-green complex is soluble in the chloroform. Overall recoveries of sodium lauryl sulfate from egg whites ranged from 94 to 100%. Collaborative study of the method is recommended.

scholarly journals Effects of Delayed Sample Processing on Determination of Total and High Molecular Weight (HMW) Adiponectin in Serum and Plasma: A Pilot Study

2016 ◽  
Vol 8 (3) ◽  
pp. 19
Author(s):  
Choaping Ng ◽  
Felicity J Rose ◽  
Sahar Keshvari ◽  
Marina M Reeves ◽  
Goce Dimeski ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Pilot Study ◽  
High Molecular Weight ◽  
Accurate Determination ◽  
Mean Difference ◽  
Serum Samples ◽  
Blood Samples ◽  
Hmw Adiponectin ◽  
Total Adiponectin

<p>Adiponectin is a beneficial adipocyte-secreted hormone, which circulates in a variety of multimeric forms termed low and high molecular weight (LMW/HMW). Effectiveness of clinical therapeutic trials which target adiponectin rely on accurate determination of circulating total and HMW adiponectin levels but the accuracy may be influenced by variations in sample handling processes. The aim of this pilot study was to investigate the effects of delayed processing of blood samples on the concentration of total and HMW adiponectin.</p><p>Materials and Methods: Fasting blood samples were collected for analysis of total and HMW adiponectin concentrations in EDTA plasma and serum from eight healthy participants.  Samples were centrifuged post 15 min storage at 4<sup>o</sup>C as the comparative ‘ideal’ method or after up to 72 h of refrigerated storage or 6 h at room temperature. Total and HMW adiponectin concentrations were measured by ELISA.</p><p>Results: Under ideal handling conditions measurements of total and HMW adiponectin concentrations were significantly higher in serum than in plasma (mean difference: -1.3 µg/mL [95% CI: -1.6, -1.0], p&lt;0.001; and, -0.6 µg/mL [95% CI: -0.7, -0.5], p&lt;0.001, respectively).  Storage of blood samples at 4<sup>o</sup>C for 72 h resulted in significant reductions in concentration of total adiponectin in serum (mean difference: -1.4 µg/mL [95% CI: -2.0, -0.8], p=0.001) and HMW adiponectin in plasma (mean difference: -0.6 µg/mL [95%CI: -0.9, -0.2], p=0.007), compared with ideal conditions.  Further analysis of serum samples showed a significant decrease in total adiponectin concentration after 6 h storage at 4<sup>o</sup>C (mean difference: -1.4 µg/mL [95% CI: -2.0, -0.8], p=0.001) compared with ideal conditions.</p><p>Conclusions: Delayed processing of samples may have differential effects on the concentration of total and HMW adiponectin in serum or plasma. Larger studies are warranted for clinical intervention trials.</p>

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