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1.
A rapid determination of total pinenes in a mixture of terpenes
By: Bardyshev, I. I.; Chern ...

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1.
A rapid determination of total pinenes in a mixture of terpenes
By: Bardyshev, I. I.; Chernyaeva, O. I.; Litvinova, A. N.

The method is based on changes of temp. owing to the isomerization, polymerization, and partial esterification of ¦Á- and ¦Â-pinenes (I) with AcOH and H2SO4 under standardized exptl. conditions avoiding the reaction of other turpentine constituents.  The app. consisted of a thermostat, a Dewar flask, two 10-cc. pipets (with siphoned lower parts which made it possible to keep them inserted in the thermostat), two thermometers (one inside the Dewar flask, the other outside), and a hand stirrer.  The temp. was kept at 25 ¡À 0.1¡ã.  The reagent was prepd. by mixing 100% AcOH and 50% H2SO4 in vol. proportions 10:1.  ¦Á-Pinene (b. 155-6¡ã, nD20 1.4653-1.4656, d420 0.8578-0.8582) was used as the standard.  A plot of the temp. differences, ¦¤t, against the contents of ¦Á-pinene in the mixt. gave a straight line.  Since at low concns. of I it took around 30 min. to reach the max. temp. a mixt. of pure ¦Á-pinene and the substance being analyzed was prepd. in the ratio 1:1.  The amt. of I in this case was calcd.: x = 2 (a - 50), where a represented ¦Á-pinene in the mixt.  In the presence of larger quantities of ¦Â-pinene 1.5% was subtracted from a.  Smaller quantities of camphene did not interfere.  This method is superior to the fractionation method.

Gidroliznaya i Lesokhimicheskaya Promyshlennost
Volume8
IssueNo. 2
Pages15-17
Journal
1955
CODEN:GLKPA2
ISSN:0016-9706



2.  Mixed (lichenoid and macular) cutaneous amyloidoses
Toribio J; Quinones P A; Virgil T R; Santa-Cruz C S

Between October 1972 and Paril 1974 a total of four patients suffering from lichen amyloidosus were admitted to the wards of the Department of Dermatology, University Hospital, Valladolid.  All these patients also showed a macular amyloidosis associated with the lichenoid eruption.  The authors emphasize that macular amyloidosis is quite commonly found as an associated and closely related condition in lichen amyloidosus.

Acta dermato-venereologica
Volume55
Issue3
Pages221-6
Journal; Article; (JOURNAL ARTICLE)
1975
ISSN:0001-5555
Journal Code:0370310
Sweden

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