I think most important compound in aloe vera is water soluble high molecular weight polysaccharide. Which gives aloe vera its characteristic viscous nature. After certain concentration of the soluble solids it can also show gel like characteristics.

http://onlinelibrary.wiley.com/doi/10.1111/jfpe.12093/full

Dear  Vallabh Chandegara,

Acemannan, a mannose-containing polysaccharide, has been reported as the main active substance present in Aloe vera. You can find Acemannan, commercially known as Carrysin™. It  is a linear polysaccharide composed of (1,4)-linked mannosyl residues, with C2 or C3 acetylated and some side chains of mainly galactose attached to C6. For more informations, See this link: http://www.sciencedirect.com/science/article/pii/S0144861798001635

Regards,

Cédric Delattre

Yes there are polysaccharides like mannose-6, heptose, acemannan biological active compound. But question is how to extract particular component to use in cosmetics rather than whole aloe vera gel.

One of the method is preparation alcohol insoluble residue (AIR)...this will separate high molecular weight polysaccharide..

http://www.sciencedirect.com/science/article/pii/S0144861702002096

This paper describes preparation of aloe vera polysaccharides standard...

http://www.ingentaconnect.com/content/aoac/jaoac/2005/00000088/00000003/art00003

Thank you Cedric  Dellattre, Nishant R swami Hulle

You're welcome!

Nothing new, just confirming the polysaccharides as the responsible for the comestic use of Aloe vera.