The invention discloses a preparation method of a bio-modified castor
protein and application of the bio-modified castor
protein to preparation of a
drug for treating malignant
pleural mesothelioma. The preparation method of the bio-modified castor
protein comprises the following steps of puffing and smashing a bio-modified castor
insect body in a normal-temperature puffing device; then, adding the smashed bio-modified castor
insect body into an expanding
solvent system extracting device to extract a crude bio-modified castor protein; collecting a solution containing the crude bio-modified castor protein, and filtering by using a
micropore filter to remove impurities; carrying out
ultrafiltration treatment by using an ultrafilter, and collecting a bio-modified castor protein
ultrafiltration solution; dissolving the
ultrafiltration solution into
acetonitrile, separating by using a
solid-phase extraction column, and collecting an eluted component; dissolving the eluted component into a
solvent system, and separating and purifying by using an ultrasonic stationary wave preparative liquid
chromatography; and preparing freeze-dried protein
powder by using a vacuum freeze-
drying machine, wherein the freeze-dried protein
powder can be used for preparing the
drug for treating malignant
pleural mesothelioma. A bio-modified castor protein preparation prepared by using the preparation method is stable in quality, clear in structure, distinct in
pharmacology and remarkable in
curative effect.