Uhh da klingt alles recht interresant
Öhm aber welchen effekt hat das ganze denn nun auf den haaren ?
-roter?
-weniger orange ?
- dunkler ?
- haltbarer ?
Nur weil es auf der haut gewisse effekte hat muss das ja nicht unbedingt für die haare gelten .
Die frage ist halt nur wo die her haben das lawson hydrophob ist
Ich hab ne arbeit gefunden:
[qoute]Based upon the fact that the leaves contain a small
amount of Lawsone (0.5 – 1.5%), a comprehensive
effort was made to use various methods of maceration
and Soxhlet extraction techniques in different polar
and non-polar solvents such as EtOAc, C6H5CH3
,EtOH, CHCl3 , CH2Cl2 , Et2O, H2O and n-C6H14.
Because lawsone was not readily soluble in water and
it is acidic (pKa 4), we had to add NaHCO3 to make the
aqueous phase weakly basic (pH 7.5) and bring any
lawsone into solution before the suspension was
filtered. The filtrate was then acidified and lawsone
was extracted into diethyl ether. From the solid crude
product remaining after removal of the ether, Lawsone
was separated in a highly pure form by means of
column chromatography.
Maceration of 100 g of the powdered henna leaves in
1000 mL of each of the above mentioned solvents
individually, at either room temperature or 80 °C and
also Soxhlet extraction of 20 g of the powdered leaves
of henna in 300 -600 mL of the solvents were
performed. The results showed the functional groups
of Lawsone, but other impurities were present too.
Soxhlet extraction techniques in different polar and
non-polar solvents all failed to give lawsone,
obviously the glycosidic precursors must be cleaved
prior to any isolation.[/qoute]
die bringen das ganze sogar in den basischen bereich und lösen mit wasser
quelle:
http://sphinxsai.com/Vol.3No.4/chem/pdf/CT=35(1941-1944)OD11.pdf
(generell mag ich irgentwelchen inetseiten nie so recht glauben so ganz ohne quellen und co kann ja jeder irgentwas behaupten )
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