Test of tensile strength (TS) of chitosan films
ASTM D882 standards for testing TS (ASTM,
1997) were used. The 10x150 mm2 of film pieces
were stored under the temperature of 23oC with
50% relative humidity for at least 40 hours. To test
the tensile strength, both ends of the samples were
secured with the texture analyzer (model TA.XT
plus, Stable Micro Systems Ltd., UK). The testing
speed was at 50 m/min with a load cell of 0.5 KN.
The distance between the two anchorages was 100
mm. The following formula was used in calculating
the tensile strength and elongation.