. Author manuscript; available in PMC: 2013 Sep 30.

Published in final edited form as: Drug Dev Ind Pharm. 2011 Mar 30;37(6):673–684. doi: 10.3109/03639045.2010.535540

Table 2.

Influence copolymer composition and copolymer source on average particle size and the encapsulation efficiency of PDLLGA naltrexone (NTX)-loaded microspheres (average of two determinations).

Copolymers	Particle size (μm)	Encapsulation efficiency (%)
PDLLGA (90:10)Poly sci. (AN)	86.13	63.87
PDLLGA (90:10)Poly sci. (R)	58.41	58.82
PDLLGA (90:10)Bpi (AN)	64.37	68.55
PDLLGA (90:10)Bpi (R)	62.51	75.87
PDLLGA (65:35)Bpi (R)	67.57	65.07
PDLLGA (50:50)Bpi (R)	76.15	58.22

R = Regular NTX; AN = anhydrous NTX.