Jansz, E.R.Pathirana, I.C.Packiyasothy, E.V.2010-07-062010-07-061983Journal of the National Science Council of Sri Lanka, 11(1):p.129-138https://dl.nsf.gov.lk/handle/1/6307Tlc spot area methodTlc-uv spectrophotometric methodTlc-uv densitometric methodDirect-uv spectrophotometric methodDirect-uv methodAgricultureDetermination of piperine in pepper (Piper nigrum L)Article