Extraction and Characterization of Cellulose from Broccoli Stems as a New Biopolymer Source for Producing Carboxymethyl Cellulose Films

Table 4

Mechanical properties of CMC films (DS ) under different film-forming conditions (2-6 g/100 mL CMC with 10-30% ( based on CMC) glycerol).

CMC concentration (g/100 mL)	2			4			6
Glycerol (g/100 mL (10-30% based on CMC))	0.2	0.4	0.6	0.2	0.4	0.6	0.2	0.4	0.6
Tensile strength (MPa)	^ab	^ab	^ab	^ab	^a	^ab	^ab	^ab	^b
Elongation at break (%)	^e	^b	^a	^de	^cd	^bc	^cd	^a	^a
WVP (gm^2·mmHg^-1/day)	^cd	^d	^bc	^bcd	^bc	^bcd	^ab	^bcd	^a

Note: values are given as (). Different letters a-e in superscript interpreted significant differences () between CMC films from different forming conditions.