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    <TD class=ob>Alkaloidy</TD>
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          <TD class="tucne">Nikotin</TD><td class="str"><br>(S)-3-(1-methylpyrrolidin-2-yl)pyridine</BR>
Molárna hmotnost 162.23<BR> 
C 73.93%, H 8.62%, N 17.25%,<BR><BR>
Je najznámejsí a najviac rozsírený alkaloid tabaku. Vyskytuje sa v listoch a semenách tabaku súčasne s inými príbuznými látkami. Nikotín je prudký jed. V malých dávkach zvysuje krvný tlak a povzbudzuje èinnost centrálneho nervového systému, vo väèsích dávkach tlmí prenos vzruchov vo vegetatívnom nervovom systéme, 
zapríčiňuje poruchy dýchania a ochrnutie srdcovej činnosti.<BR>
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          <TD class="tucne">Nornikotin</TD>
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(S)-3-(1-H-pyrrolidin-2-yl)pyridine
<BR>
Molárna hmotnost 148.4<BR> 
C 72.77%, H 8.08%, N 18.86%,<BR>
<BR>Vedlajsia splodina nikotínu, meni štruktúru proteínov<br> 

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