Table I.

Thermodynamic Parameters of Pure TA and Freeze-Dried TA–CT Samples at pH ∼5

Type of sample	Temperature of melting (°C)	Peak area (mJ)	Enthalpy of melting (ΔH m) (J/g)	Degree of crystallinity (X c) (%)
Pure TA	214.31	322.69	108.64	100
LMW
1:1	214.72	82.24	27.41	25.23
1:2	214.54	26.84	8.94	8.23
1:4	NPD	0	0	0
1:8	NPD	0	0	0
1:16	NPD	0	0	0
MMW
1:1	214.24	98.36	32.79	30.18
1:2	213.84	39.78	12.83	11.81
1:4	NPD	0	0	0
1:8	NPD	0	0	0
1:16	NPD	0	0	0

Values expressed as a mean of three to five determinations

Pure TA tolfenamic acid as purchased from the supplier, LMW low molecular weight chitosan, MMW medium molecular weight chitosan, NPD no peak detected