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By J. Szejtli

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Phosphorylase [ 80,99], Bacillus polymyxa amylase [ 229,377 l, Aspergillus oryzae amylase [ 156,279 ], and hog pancreas amylase [ 250 1 can hydrolyse the cyclodextrins, but generally only slowly. The rate of hydrolysis of y-cyclodextrin by saliva amylase [ 230,292 1 reaches about 1% of the value of starch [ 82 ], and the hydrolysis of ~-cyclodextrin is negligible. 02 mole of sodium chloride), did not show any increase in reducing power at 37°C after 5h. Under similar conditions soluble starch reached the maximum reducing power within 10 min.

Absorption of the guest and of the cyclodextrin are therefore separate processes. 12), while only an insignificant amount of cyclodextrin is absorbed intact. The cyclodextrin molecule is relatively large, its outer surface being strongly hydrophilic. It is a true carrier: bringing the hydrophobic guest into solution, keeps it in a dissolved state, and transports it to the lipophilic cell membrane. After delivering the guest to the cell (because the cell has higher affinity for the guest than the cyclodextrin), the carrier remains in the aqueous phase.

13 1. 22 O. 004 1. 08 O. 19 1. 45 O. 8 mg/kg mg/kg 1. 34 O. 40 1. 18 1. 45 1. 67 1. 1-20. Radioactivity exhaled by rats after oral administration of J AC-fJ-cyclodextrin (36mg kg- I) or lAC-glucose (13mg kg'- J ). radioactivity was found in the large intestine after IAC-~-cyclodextrin treatment than after lAC-glucose treatment. It is very likely that some of the ~-cyclodextrin is excreted in the faeces. The amount of exhaled radioactivity was practically identical in rats treated orally with 14C-glucose, '14C-starch or 14C-~-cyclodextrin in a 24h period (58-64% of administered radioactivity).

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