ABSTRACT
A new naphthoquinone, 6-methoxyplumbagin was isolated from the acetone extracts of Polygonum aviculare. Its structure was elucidated by various spectroscopic methods. The known compounds sitosterol, oleanolic acid and 5,6,7,4'-tetramethoxyflavanone were also obtained from this natural source.
Subject(s)
Flavanones , Naphthoquinones/isolation & purification , Plants, Medicinal/chemistry , Polygonaceae/chemistry , Flavonoids/chemistry , Flavonoids/isolation & purification , Molecular Structure , Naphthoquinones/chemistry , Nuclear Magnetic Resonance, Biomolecular , Oleanolic Acid/chemistry , Oleanolic Acid/isolation & purification , Saudi Arabia , Sitosterols/chemistry , Sitosterols/isolation & purificationABSTRACT
A comparison of 130 grafts done in 101 patients included 47 veins, 25 Johnson & Johnson dialdehyde-starch-tanned collagen prostheses, and 58 NCGT grafts that had been followed for a 40-month period. This study had documented the fact that in spite of frequent poor runoff, a useful result is provided by the NCGT graft apparently due in part to its built-in nonthrombogenic structure providing a cumulative patency of 73%. The patency rate was even superior with venous bypasses. Therefore, we still feel that the autogenous vein provides the most useful bypass conduit available in vascular reconstruction. In situations where a vein could not be used or was not available the NCGT graft offers an equally useful nonthrombogenic surface to maintain prolonged patency. Thus, collagen appropriately modified can provide a useful prosthesis in vascular reconstruction.
