Phytochemical Studies and Biological activities on the constitutions of Z. Armatum DC.

Abstract

The thesis in hand mainly describes the isolation and structure elucidation of compounds from the ethyl acetate and chloroform soluble fractions. Four new and eight known compounds have been isolated from Zynthoxylem armatum DC.

New Compounds. 1. 2, 6, 7-trimethoxy-8-(3-methyl-2-butenyl) carbazole-3-carbaldehyde (117) 2. Methyl-2, 6, 7-trimethoxy-8-(3-methyl-2-butenyl)carbazole-3-carboxylate (118) 3. 4-methoxy-12, 12-dimethylcyclopenta furoquinoline-10-carbaldehyde (123) 4. Methyl, 4-methoxy-12, 12-dimethylcyclopenta furoquinoline-10-carboxylate (124)

Known Compounds.

1. Sezamine (119) 2. Methyl Piperitol (120) 3. Fargesin (121) 4. Dictamine (122) 5. Planispine A (125) 6. Planispine B (126) 7. Lupenone (127) 8. Lupeol (128)

A brief discussion on biological activities of various fractions as well as of the isolates is presented in the present work. It was observed that the compounds 117-122 showed higher anti oxidant properties than ascorbic acid. The compounds 117, 118 and 122 were found to be more active than the rest of the isolates. The two new furoquinoline alkaloids (123) and (124) showed significant DPPH radical scavenging activity compared to ascorbic acid. The compound 123 was found to be more active than compound 124, which was further supported by ABTS radical scavenging assay.

The n-hexane, ethyl acetate, chloroform and n-butanol fractions were screened for anti fungal activities against Aspergillus flavus and Aspergillus niger. It was found that ethyl acetate soluble fraction showed maximum inhibition and decreased the fungal growth by 55.5 and 61%, chloroform fraction showed moderate inhibition while n-hexane and n-butanol fractions showed minimum inhibition of the corresponding fungi.