Fabrication of PLA-PEG Nanoparticles as Delivery Systems for Improved Stability and Controlled Release of Catechin

Table 1

Equations and parameters of mathematical models.

Model	Equation	Parameter definition
Zero order		: concentration of drug
		: zero-order constant
		: time
First order		: initial concentration
		: concentration at time
		: first-order constant
		: time
Higuchi model		: amount of drug released in time
		: Higuchi constant
		: time
Hixson-Crowell model		: initial amount of drug
		: remaining amount of drug at time
		: Hixson-Crowell constant
		: time
Korsmeyer-Peppas model		: fraction of drug released at time
		: Korsmeyer-Peppas constant
		: time
		: release exponent