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Multilayer membraoes of l,MipaImitoyl-sn-glycer+~phorylchorylcho~~ were prepared in D,Q and exposed to y-radiation. Changa in the chemical structure due to irradiation were studied by 'H, "C and "P NMR after lyophilization and dissolution in chloroform-methanol (1 : 2, vjv). Qne-and two-dimensional techniques were used. l-Palmitoyl-sn-glycei+~pb~pbo~~choline, 2-palmitoyl-sn-glycero-3-pbosphorylcboli, glycer+lphos-phorylcholiw and palmitic acid were identified as new componen&. Their development during irradiation was quantitatively determined. The results were discussed in terms of possible reaction steps responsible for the radiolytic decomposition.

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