Isolation of Alkaloidal Constituents of Zanthoxylum usambarense and Zanthoxylum chalybeum Using Ion-Pair HPLC

Isolation of Alkaloidal Constituents of Zanthoxylum usambarense and Zanthoxylum chalybeum Using Ion-Pair HPLC Isolation of Alkaloidal Constituents of <i>Zanthoxylum usambarense</i> and <i>Zanthoxylum chalybeum</i> Using Ion-Pair HPLC Examination of alkaloidal constituents of zanthoxylum usambarense by a combination of ion‐pair extraction and ion‐pair chromatography using sodium perchlorate Chemical constituents and biological activities of<i> Zanthoxylum usambarense</i> (R)-(+)-Isotembetarine, a Quaternary Alkaloid from Zanthoxylum nitidium (<i>R</i>)-(+)-Isotembetarine, a Quaternary Alkaloid from <i>Zanthoxylum nitidium</i> 10-Hydroxy-Nb-methyl-corynantheol, a new quaternary alkaloid from the stem bark of Strychnos usambarensis 3′,4′,5′,6′ Tetradehydrolongicaudatine Y, an anhydronium base from Strychnos usambarensis A New Benzophenanthridine Alkaloid from &lt;I&gt;Zanthoxylum nitidum&lt;/I&gt; Benzophenanthridine alkaloids from the stem bark of a Zanthoxylum species