The catheter tubes of medical silicon rubber were dipped in ethanol. The effluents were fractionated by thin-layer chromatography (TLC), and their fractions were analyzed by ion trap electrospray ionization mass spectrometry (ESI-MS). The ESI mass spectra resulting from the main TLC fraction, Rf=0.5 showed that the effluents were determined to be poly(dimethyl siloxane)(8 to 20 mer) that is a main part of a silicon rubber.
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