Polyetherimide (PEI) was sulfonated by chlorosulfonic acid for the first time. The sulfonated products were characterized by FT-IR, DSC, ion exchange capacity a
A new 30-nortriterpenoid glycopside, 3-O-α-L-arabinopyranosyl-30-norhederagenin 28-O-α-L-rhamnopyranosyl(1→4)-β-D-glucopyranosyl (1→6)-β-D-glucopyranoside
A new phytosphingosine-type ceramide, armillaramide 1, has been isolated from the fruiting bodies of Basidiomycetes Armillaria mellea (Vahl ex Fr.) Quél. .
In this paper, a new HPLC method was established to determine the carbonyl compounds in air. As the absorbent, 2, 4-dinitrophenylhydrazine (2, 4-DNPH) reacted w