Objective: To investigate film-forming properties of main film-forming materials in water extraction liquid and different concentration ethanol extraction liquid of Platycladus orientalis leaf

then to provide references for selection and application of film-forming material from Chinese medicine spray membrane agent containing P. orientalis leaf. Method: According to solubility of film-forming material

polyvinylpyrrolidone(PVP)

polyvinyl alcohol(PVA)

ethyl cellulose(EC) and methyl cellulose(MC) were selected as film-forming materials

membrane structure photos was analyzed by microscopy and image capture software

film-forming property of film-forming materials was investigated in water extraction liquid and different concentration ethanol extraction liquid of P. orientalis leaf. Result: Film-forming properties of PVP-K30 and PVP-K90 in water extraction liquid and different concentration ethanol extraction liquid of P. orientalis leaf was very fine;PVA in water extraction liquid and the concentration of 20%

40%

60% ethanol extraction liquid could form film

but surface of membrane was uneven and rough;Film-forming property of EC in extraction solution of 100% ethanol was very fine

but it was poor in extraction solution of 80% ethanol

membrane structure was not obvious;Film-forming properties of MC in water extraction liquid and different concentration ethanol extraction liquid of P. orientalis leaf were very well

it could form a layer of thick and dense film;Film-forming property of PVB was excellent only in extraction solution of 100% ethanol. Conclusion: Choice of film-forming material had a relationship with polarity of extraction solvent for extraction liquid of P. orientalis leaf;Film-forming properties of PVP-K30 were fine in water extraction liquid and different concentration ethanol extraction liquid of P. orientalis leaf

it was optimum choice of film-forming material for Chinese medicine spray film agent and film agent containing P. orientalis leaf.