Re: Here's a pair of shades

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Posted by Pierre on February 6, 2005 at 20:33:47:

In reply to: Here's a pair of shades posted by Catherine Cartwright-Jones on February 6, 2005 at 18:08:21:

: Lawsone is a red-orange dye molecule, and its present in henna.
:
: Tannins are a large group of molecules that are present in lawsone,
: cassia obobvata, emblica officinalis, and ...... grapes, tea, wine,
: chocolate, blackberries, lots of other things too
:
: Tannins are plant polyphenols. Their main characteristic is that they
: bind and precipitate proteins. When they're in your hair gets tannin
: rich moosh on it, the tannins bind the keratin protein strands and
: strengthen them!
:
: If I understand correctly, lawsone is part of a tannin group.

The chemical characteristic of tannin groups is that they have two or
more =O or -OH groups next to each other on the phenol ring. Lawsone
has -OH next to =O; its isomer juglone does not (the -OH is on the
other phenol ring). So henna by itself dyes hair and stays there; walnut
doesn't, unless the juglone has something else to keep it in the hair.

Tannins consist of several tannin groups linked together either directly or
with the aid of a sugar molecule. Do lawsone molecules link together like
this? Can such a linkage hold a juglone molecule, even though it is not a
tannin group?

I hope this doesn't blind you even further...

Follow Ups

Re: Here's a pair of shades loans 15:48:44 2/15/2005 (0)
The sun is setting - lawsone orange Raibow-Vanessa 15:44:55 2/7/2005 (0)

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: : Lawsone is a red-orange dye molecule, and its present in henna. : : : : Tannins are a large group of molecules that are present in lawsone, : : cassia obobvata, emblica officinalis, and ...... grapes, tea, wine, : : chocolate, blackberries, lots of other things too : : : : Tannins are plant polyphenols. Their main characteristic is that they : : bind and precipitate proteins. When they're in your hair gets tannin : : rich moosh on it, the tannins bind the keratin protein strands and : : strengthen them! : : : : If I understand correctly, lawsone is part of a tannin group. : : The chemical characteristic of tannin groups is that they have two or : more =O or -OH groups next to each other on the phenol ring. Lawsone : has -OH next to =O; its isomer juglone does not (the -OH is on the : other phenol ring). So henna by itself dyes hair and stays there; walnut : doesn't, unless the juglone has something else to keep it in the hair. : : Tannins consist of several tannin groups linked together either directly or : with the aid of a sugar molecule. Do lawsone molecules link together like : this? Can such a linkage hold a juglone molecule, even though it is not a : tannin group? : : I hope this doesn't blind you even further...
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