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Asya,<br>
The following is Dr. Geoff Cox's (HPLC expert) answer to your
question:<br>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Given
the size of pollen particles, ie greater than 6 microns, why not
filter the ethanol through a 0.5 micron membrane filter? These
are available in Teflon or several other polymers. Take a look
at:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><a class="moz-txt-link-freetext" href="http://www.emdmillipore.com/US/en/life-science-research/chromatography-sample-preparation/filtration-products/microfiltration-membranes/FqCb.qB.7ZkAAAFBDQZlvzJE,nav?cid=BI-XX-BSP-P-GOOG-ASP0-B343-1016">http://www.emdmillipore.com/US/en/life-science-research/chromatography-sample-preparation/filtration-products/microfiltration-membranes/FqCb.qB.7ZkAAAFBDQZlvzJE,nav?cid=BI-XX-BSP-P-GOOG-ASP0-B343-1016</a><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">There
are several suppliers of such things; one of them should sell
something that will work. Asya should search on Google for 0.45
micron filters. The critical thing is to be able to remove the
pollen from the filter afterwards, but that may depend on what
they want to do with them after.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Geoff.<o:p></o:p></span></p>
<big><big><big><big><big><big><big><big><span style="font-size:
11pt; font-family:
"Calibri","sans-serif";"><o:p> I
hope this is helpful.<br>
Hilary Cox<br>
</o:p></span></big></big></big></big></big></big></big></big><br>
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