Studies on Positive and Negative ionization mode of ESI-LC-MS/ MS for screening of Phytochemicals on Cassia auriculata (Aavaram Poo), Ramakrishnan, Paranthaman, Kalakandan Sureshkumar, and Pakkirisamy Muthukumaran , Pharmacognosy Journal, March 2018, Volume 10, Issue 3, p.457-462, (2018)