Woburn Iodine Absorption Method: A Measure of Total Unsaturation in the Presence of Conjugated Double Bonds

Mikusch, J von; Frazier, Charles H.

doi:10.1021/i560099a009

Cited by 43 publications

(8 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They infer that the difficulties were due chiefly to the presence of resin acids. In view of our findings it would appear that only those iodine number methods applicab!e to substances containing conjugated acids should be used (13). Furthermore, there is no published information regarding the thioeyanogen values of the conjugated acids.…”

Section: Analysis Of Miscellaneous Samplesmentioning

confidence: 81%

Spectrophotometric determination of small proportions of polyunsaturated constituents in fatty materials

et al. 1945

View full text Add to dashboard Cite

Summary Existing ultraviolet spectrophotometric methods have been modified for application primarily to the detection and estimation of low proportions of conjugated and nonconjugated unsaturated constituents in fats, oils, and soaps. The method is applicable also to fatty materials having high proportions of these constituents. Modifications include corrections for absorption by interfering substances, use of alkaline glycerol as an isomerization medium in the analytical procedure, and correction of absorption data on the isomerized product for absorption by conjugated constituents in the material before isomerization. The presence of small proportions of highly unsaturated conjugated and nonconjugated compounds is established in lards, tallows, tallow soaps, and highly purified esters and acids. Tall oil fatty acids are shown to contain approximately 10% of conjugated diene acids and a small amount of linolenic acid.

show abstract

Section: Analysis Of Miscellaneous Samplesmentioning

confidence: 81%

Spectrophotometric determination of small proportions of polyunsaturated constituents in fatty materials

et al. 1945

View full text Add to dashboard Cite

show abstract

“…The hydrophilic reactive microgel (HRM) double bonds were measured according to the bromating method 21, 22. The following protocol was used: 100‐mL 0.25 wt % HRM solution was added into a clean 250‐mL iodine bottle.…”

Section: Methodsmentioning

confidence: 99%

Chemical modification and synthesizing conditions of nanocomposite hydrogels with high mechanical strength crosslinked by hydrophilic reactive microgels

Qin

Fang

Feng

2011

J of Applied Polymer Sci

View full text Add to dashboard Cite

Series of polyacrylamide hydrogels with high mechanical strength were synthesized using hydrophilic reactive microgels (HRM) with C¼ ¼C double bonds as crosslinkers. The hydrophilic microgels were prepared by inverse emulsion photopolymerization and then were chemical modified by N-methylolacrylamide (NMA) to obtain HRM. Chemical-modifying conditions affecting the HRM double bound content were investigated. The maximum double-bond content was 1.82% at the optimum conditions of NMA 8 g, hydrochloric acid 0.8 mL, reaction temperature 60 C, and time 4 h. The mechanical properties of the hydrogels were significantly enhanced by using HRM as crosslinkers instead of the conventional crosslinkers. These HRM hydrogels were studied by varying such parameters as HRM content, monomer concentration, HRM double-bond content, and the initiator dosage.

show abstract

“…Von Mikuseh and Frazier (14) have recommended the use of Hanus solution, in which the concentration t Presented before the Chicago meeting of the American Oil Chemists' Society, November 2, 1949. 2Address: The Griffith Laboratories, 1415 W. 37th street, Chicago, Ill. 3Associate Professor of Biochemistry.…”

mentioning

confidence: 99%

“…Bromine vapor has been used to measure the absorption of all double bonds, including those conjugated. Various investigators using the bromine vapor method have obtained values for tung oil ranging from 217 to 266 (14). This method is very complicated and requires special equipment.…”

mentioning

confidence: 99%

The determination of the true iodine numbers of oils containing conjugated double‐bond systems

Klee

Benham

1950

J Americ Oil Chem Soc

View full text Add to dashboard Cite

Summary The modified Rosenmund‐Kuhnhenn procedure, as described by Benham and Klee, has been applied to conjugated systems. The only difference is that the 1‐minute reaction time is extended to 30–120 minutes depending upon sample weight and excess reagent. Such a procedure gives true iodine numbers and has been investigated for various tung oils, oiticica oil, isomerized fatty acids, and dehydrated castor oil.

show abstract

Woburn Iodine Absorption Method: A Measure of Total Unsaturation in the Presence of Conjugated Double Bonds

Cited by 43 publications

References 20 publications

Spectrophotometric determination of small proportions of polyunsaturated constituents in fatty materials

Spectrophotometric determination of small proportions of polyunsaturated constituents in fatty materials

Chemical modification and synthesizing conditions of nanocomposite hydrogels with high mechanical strength crosslinked by hydrophilic reactive microgels

The determination of the true iodine numbers of oils containing conjugated double‐bond systems

Contact Info

Product

Resources

About