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• W2076008311 abstract "The mechanism of intestinal absorption of liposomally entrapped [14C]inulin and 125I-labelled poly(vinylpyrrolidone) was studied using the isolated rabbit intestinal loop with intact perfused vasculature, a system more closely resembling an in vivo system than the everted sac technique. [14C]Inulin or 125I-poly(vinylpyrrolidone) was entrapped in liposomes prepared from unsaturated egg phosphatidylcholine and soya phosphatidylcholine, and saturated distearoylphosphatidylcholine (18:0), dipalmitoylphosphatidylcholine (16:0) and dimyrostoylphosphatidylcholine (14:0). Free and liposomally entrapped macromolecules were introduced in the ileum and the transport of liposomes and entrapped macromolecules into the venous effluent was monitored by measuring the presence of the aqueous marker 125I-poly(vinylpyrrolidone) or [14C]inulin, and lipid marker [3H]cholesterol. The results show that intact liposomes are not transported across intestine into the venous effluent, but they are taken up by mucosal cells and digested intracellularly, releasing the entrapped markers 125I-poly(vinylpyrrolidone) and [14C]inulin. These markers are then transported into the venous effluent as free molecules. The absorption of liposomally entrapped [14C]inulin into the venous effluent is biphasic, first slow for 30 min (i.e., a lag period of 30 min), followed by a rapid linear increase. The duration of the lag period and the rate of absorption of the entrapped [14C]inulin are dependent on the degree of saturation and the transition temperature of the phospholipids used to prepare liposomes. The possible explanation of the lag period based on the evidence presented here is that it is the time required for the liposomes to be taken up by mucosal cells and digested intracellularly. Intracellular digestion of liposomes prepared from saturated phospholipids is more rapid than from those prepared from unsaturated phospholipids, and the greater the fatty acid chain length of the saturated phospholipids the more rapid the intracellular degradation of liposomes." @default.
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• W2076008311 title "Intracellular digestion of saturated and unsaturated phospholipid liposomes by mucosal cells. Possible mechanism of transport of liposomally entrapped macromolecules across the isolated vascularly perfused rabbit ileum" @default.
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• W2076008311 doi "https://doi.org/10.1016/0304-4165(85)90179-5" @default.
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