Functions of this reagents!!! - Please help me with DNA extraction!!! (Jun/30/2010 )

Dear all, Please help me if you have the answers to my questions!!!

What are the functions of the following reagents on DNA extraction of Algae???

PVPP
DETC (Diethyldithiocarbamic acid)
β-mercaptoethanol
Tris HCL
CTAB
EDTA???


Please help me with this... THank U so much

WeiXiong
Final Year Project Student!!!!

I KNOW CTAB IS A DETERGENT USED TO BREAK UP LEAF TISSUE IN ORDER TO COLLECT DNA.