Modified Method for Extracting Light Filth from Chocolate Liquor by Using 2% Igepal CO 630 as Detergent Solution: Collaborative Study

1978 ◽  
Vol 61 (5) ◽  
pp. 1041-1042
Author(s):  
Donald A Mastrorocco ◽  
Geraldine H Wagner
Keyword(s):  
Sodium Lauryl Sulfate ◽  
Collaborative Study ◽  
Detergent Solution ◽  
Lauryl Sulfate ◽  
Chocolate Liquor ◽  
Modified Method ◽  
Filter Papers ◽  
Detergent Solutions

Abstract A collaborative study was conducted among 3 laboratories comparing 2 detergent solutions, 2% Igepal CO 630 and the AOAC-approved 2% sodium lauryl sulfate, in the analysis of extraneous materials in chocolate liquor. Each laboratory tested a minimum of 8 samples per detergent solution. No significant differences were found between the numbers of rodent hairs and insect fragments recovered with the 2 detergent solutions and, in addition, igepal produced cleaner filter papers. The 2% Igepal CO 630 detergent solution has been adopted as a substitute for 2% sodium lauryl sulfate in 44.006(b) for chocolate liquor.

Comparison of Igepal and Sodium Lauryl Sulfate as Defatting Agents in Extraneous Materials Analysis of Chocolate Liquor

1977 ◽  
Vol 60 (3) ◽  
pp. 744-745
Author(s):  
Donald A Mastrorocco ◽  
Geraldine H Wagner
Keyword(s):  
Sodium Lauryl Sulfate ◽  
Detergent Solution ◽  
Lauryl Sulfate ◽  
Materials Analysis ◽  
Appreciable Difference ◽  
Chocolate Liquor ◽  
Wide Range ◽  
Filter Papers ◽  
Detergent Solutions

Abstract A detergent solution, 2% igepal CO 630, was compared with the AOAC-approved 2% sodium lauryl sulfate in the extraneous materials analysis of chocolate liquor. Thirty-two liquor samples were analyzed by one technician using both detergent solutions. No appreciable difference was noted between insect fragment and rodent hair counts obtained with the 2 detergent solutions. Igepal costs less and its use results in fewer filter papers to read. A wide range of insect fragment and rodent hair contamination should be studied with this reagent.

Alternative Sieving Method for Extraction of Light Filth from Cheeses: Collaborative Study

1994 ◽  
Vol 77 (5) ◽  
pp. 1153-1156
Author(s):  
Marvin J Nakashima
Keyword(s):  
Sodium Lauryl Sulfate ◽  
Collaborative Study ◽  
Sulfate Solution ◽  
Lauryl Sulfate ◽  
Test Portion ◽  
Alternative Method ◽  
Broad Variety ◽  
Filter Papers

Abstract A collaborative study was conducted on an alternative sieving method for the extraction of light filth from cheeses. The alternative method was developed that is applicable to broad variety of cheeses. A 225 g test portion is dispersed in a solution of 5.7% HCI, Igepal CO-730, and Igepal DM-710. Digested cheese is wet-sieved on a No. 230 sieve. The residue is treated with Tergitol Anionic 4, transferred to 1% sodium lauryl sulfate solution, heated, and maintained at 65°-75°C for 10 min. The residue is washed with these 2 surfactants a maximum of 4 times until it is reduced to an amount that is filterable. The residue is filtered and the filter papers are examined microscopically at a magnification of ca 30×. Average recoveries by 9 collaborators for 3 spike levels of rat hairs (5,10, and 15) were 80, 68, and 81%, respectively; for insect fragments (5,15, and 30) recoveries were 97, 90, and 92%, respectively. The alternative sieving method for extraction of light filth from cheeses has been adopted first action by AOAC INTERNATIONAL.

Extraction of Light Filth from Coconut: Collaborative Study

1978 ◽  
Vol 61 (4) ◽  
pp. 898-899
Author(s):  
Joel J Thrasher
Keyword(s):  
Aqueous Phase ◽  
Sodium Lauryl Sulfate ◽  
Collaborative Study ◽  
Mineral Oil ◽  
Official Method ◽  
Lauryl Sulfate ◽  
Plant Debris ◽  
Filter Papers

Abstract The official method for filth in coconut, 44.029, frequently produces filter papers with excessive plant debris and low hair recoveries. To overcome these deficiencies, 3 changes in the method were made: (1) the defatting step was modified to use sodium lauryl sulfate in combination with borax for better defatting; (2) 40% isopropanol was substituted for 60% ethanol as the aqueous phase for cleaner papers; and (3) mineral oil was substituted for n-heptane to improve hair recoveries. These changes resulted in higher, more reproducible recoveries of rodent hairs and insect fragments and cleaner filter papers. The method has been adopted as official first action to replace 44.029.

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.

Collaborative Study of a Method for Sodium Lauryl Sulfate in Egg Whites

1968 ◽  
Vol 51 (3) ◽  
pp. 540-543
Author(s):  
John Wiskerchen
Keyword(s):  
Sulfuric Acid ◽  
Quantitative Determination ◽  
Sodium Lauryl Sulfate ◽  
Collaborative Study ◽  
Colorimetric Method ◽  
Egg White ◽  
Mean Deviation ◽  
Lauryl Sulfate ◽  
Benzethonium Chloride

Abstract A colorimetric method for the quantitative determination of sodium lauryl sulfate in liquid, frozen, and powdered egg white was studied by eight collaborators. Determinations were made on flake and powdered egg white at levels of 0.05, 0.1, and 0.2% (w/w) and on liquid egg white at levels of 0.006, 0.0125, and 0.0250% (w/w) sodium lauryl sulfate. The egg white is dissolved in water, and the protein is precipitated with ethanol and removed by filtration. An aliquot of the filtrate is evaporated to dryness, and the residue is dissolved in water and acidified with sulfuric acid. The sodium lauryl sulfate is complexed with Azure A, extracted into chloroform, and determined spectrophotometrically at 637 mμ. A blank determination is made on another aliquot of the filtrate by complexing the sodium lauryl sulfate with benzethonium chloride. This is a stable colorless complex. Average recoveries in the collaborative study were 98—102% with a mean deviation of 2.8—5.4%. It is recommended that the method be adopted as official, first action.

ASSESSMENT OF THE TOXICITY AND HAZARD OF SODIUM LAURYL SULFATE AT DIFFERENT EXPOSURE ROUTES

2020 ◽  
pp. 56-59
Author(s):  
M. V. Bidevkina ◽  
M. I. Golubeva ◽  
A. V. Limantsev ◽  
I. N. Razumnaya ◽  
T. N. Potapova ◽  
...  
Keyword(s):  
Sodium Lauryl Sulfate ◽  
Exposure Level ◽  
Hazardous Substance ◽  
Lauryl Sulfate ◽  
Upper Respiratory Tract ◽  
Mucous Membranes ◽  
Chloroprene Rubber ◽  
Upper Respiratory ◽  
Exposure Routes ◽  
Number Of Cells

Sodium lauryl sulfate is the most common surfactant used in the production of detergents, chloroprene rubber, plastics, artificial furs and in pharmaceutical industry. Sodium lauryl sulfate is a moderately hazardous substance when introduced into the stomach (DL50 for white mice and rats is in the range of 2086-2700 mg/kg), has a pronounced local irritant effect on the skin and mucous membranes of the eyes, has a skin-resorptive, sensitizing and pronounced cumulative effects. The threshold for acute inhalation action is set at 15,3 mg/m3 for changes in the function of the nervous system and irritating effects on the mucous membranes of the upper respiratory tract (an increase in the total number of cells in the nasal flushes).Recommended for approval tentative safe exposure level of sodium lauryl sulfate in the air of the working area is 0.2+ mg/m3 (aerosol).

scholarly journals Preparation of alkali-resistant PVDF membranes via immobilization of sodium lauryl sulfate (SDS) on surface

2021 ◽  
Vol 11 (3) ◽  
Author(s):  
Gongpu Wen ◽  
Kun Chen ◽  
Yanhong Zhang ◽  
Yue Zhou ◽  
Jun Pan ◽  
...  
Keyword(s):  
Sodium Lauryl Sulfate ◽  
Alkali Treatment ◽  
Membrane Surface ◽  
Alkali Resistance ◽  
Lauryl Sulfate ◽  
Uv Curable ◽  
Pvdf Membrane ◽  
Glycol Diacrylate ◽  
Polyester Acrylate ◽  
Uv Curable Resin

AbstractA novel strategy was proposed to fabricate alkali-resistant PVDF membrane via sodium lauryl sulfate (SDS) attached to the surface of membrane and immobilized by UV-curable polyester acrylate and tri(propylene glycol) diacrylate (TPGDA). The attached anionic surfactant, SDS, on the membrane surface can resist the alkali corrosion by NaOH, and the curing of the resin can immobilize the SDS on the membrane firmly. Due to the unique alkali resistance of SDS and resin formed, the UV-curable resin-modified PVDF membrane showed greatly enhanced alkali-resistant ability. Characterization of SEM and FTIR showed that polyester acrylate and TPGDA were cured successfully under the action of 1-hydroxycyclohexyl phenyl ketone (184) and ultraviolet light. Whiteness, differential scanning calorimeter and X-ray photoelectron spectrometer characterization showed that the modified PVDF membrane had a lower degree of dehydrofluorination than the pristine PVDF membrane after alkali treatment. Results of the detailed alkali-resistant analysis indicated that the F/C ratio of the UV-curable resin-modified PVDF membrane decreased by 2.6% after alkali treatment compared to pristine PVDF membrane decreased by 19.28%. The alkali-resistant performance was mainly attributed to the immobilized SDS. This study provided a facile and scalable method for designing alkali-resistant PVDF membrane, which shows a promising potential in the treatment of alkaline wastewater and alkaline-cleaning PVDF membrane.

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