Chemical dehydration of specimens with 2,2-dimethoxypropane (DMP) for paraffin processing of animal tissues: Practical and economic advantages over dehydration in ethanol

Chemical dehydration can be accomplished using 2,2-dimethoxypropane (DMP), In the presence of an acid catalyst, this liquid reacts with water generati ng methanol and acetone as products. Although DMP is more expensive per mil liliter than ethanol and other solvents used for dehydration, it is an econ omical alternative because a much smaller volume is needed. Slow penetratio n of DMP was previously thought to restrict its use to tiny specimens, but we now show that pieces of tissue as thick as 2 cm are dehydrated by overni ght immersion in acidified DMP, We also show that dehydration in acidified DMP does not impair the staining of RNA or other basophilic components of a nimal tissues. The temperature and concentrations of methanol and H+ in the chemical dehydrating agent are too low to produce histochemically detectab le methylation or nucleic acid extraction.