초록

The microcapsules have walls of 40-500 nm thick and are useful in ultrasonic imaging. The control of median size, size distribution and degree of insolubilisation and cross-linking of the wall-forming material allows novel microsphere preparations to be produced.

대표청구항 ▼

[ We claim:] [1.] Sterile hollow microcapsules with proteinaceous walls in which at least 90% of the microcapsules have a diameter in the range 1.0-8.0 .mu.m; at least 90% of the microcapsules have a wall thickness of 40-500 nm; and at least 50% of the protein in the walls of the microcapsules is so

[ We claim:] [1.] Sterile hollow microcapsules with proteinaceous walls in which at least 90% of the microcapsules have a diameter in the range 1.0-8.0 .mu.m; at least 90% of the microcapsules have a wall thickness of 40-500 nm; and at least 50% of the protein in the walls of the microcapsules is so cross-linked as to be resistant to extraction in 1% HCl for 2 mins, wherein said microcapsules are capable of being dried to form a dry powder of said microcapsules.