Table 1.

Release kinetics of RPC-loaded microspheres

Model	Free RPC		RPC-loaded microspheres
	Equation	Correlation coefficient (r2)	Equation	Correlation coefficient (r2)
First order	ln(1− Q) =3.276t −1.092	0.9432	ln(1− Q) =5.276t +0.562	0.9534
Higuchi	Q =8.211t½+1.219	0.9821	Q =8.627t½+1.921	0.9812
Korsmeyer–Peppas	lnQ =0.256lnt −0.627	0.9525	lnQ =1.287lnt +0.192	0.9546
Weibull	lnln(1/(1− Q)) =3.291lnt −1.281	0.9829	lnln(1/(1− Q)) =1.982lnt +0.261	0.9931

Abbreviation: RPC, ropivacaine.