Ah yes, the caramilk mystery..
 
 
   Peter:
 
   I did a seminar on microencapsulated pesticides a few years ago, and
   perhaps I could find the information in the archives, but I'm sure you'd
   get a better answer from one of the manufacturers. Microencapsualted
   diazinon was (is?) registered in Canada as a Basudin formulation.
 
   As I recall, the capsules were a polymer formed as a reaction when a
   chemical mixed with the pestcide, came in contact with a second
   chemical as the pesticide was injected into a receiving liquid. By
   adjusting the injection stream size and pressure, the polymer
   concentration, and the polar properties of the 2 liquids as the
   pesticide was injected, droplets of pesticide of the  right size, became
   encapsulated with a wall thickness that resulted in the desired extended
   release.
 
   There were different materials used if the product was water or oil
   based, but the principle was similar. I don't know if there is a
   technique for small amounts. Wasn't someone microencapsulating a pollen
   extract for improving the attractiveness of pollen substitute?
 
   Kerry Clark, Apiculture Specialist
   B.C. Ministry of Agriculture
   1201 103 Ave
   Dawson Creek B.C.
        V1G 4J2  CANADA          Tel (604) 784-2225     fax (604) 784-2299
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