研究概要

Biodegradable starch films- An answer to pollution

研究機関名

Department of Food, Civil Supplies and Consumer Affairs, Amritsar (Punjab State), INDIA

代表者

本研究の要旨

Biodegradable films were prepared from native as well as physically modified (heat-moist treatment) starches obtained from three sources i.e. Water chestnut, Corn and Potato. Results revealed that the starch films prepared from HMT starch were thicker (0.46-0.52 mm) whereas those from native starch were pliable having maximum diameter of 0.29 mm for native potato starch films. The solubility of starch films examined at different pH showed that the starch films were more soluble in acidic (2.0 pH) conditions as native water chestnut starch films got 39.55% soluble over a period of 24 hrs at 25 . HMT starch films greater difficulty for puncture as force required to infuse puncture in HMT treated potato starch film was 4.54 N and puncture strength was 29.673 N whereas in comparison native starch films posed 2.525- 3.213 N of puncture strength. Water vapor transmission rate (WVTR) was observed to be lower in HMT treated starch films with water chestnut starch films presenting the lowest value at 98 g.mm m-2d-1. However, the WVTR values for the native starch films were found to be in the range 98-121 g.mm m-2d-1. The Tensile strength was observed to be highest (75.87 N) in films prepared from HMT water chestnut starch whereas the value for native starch films were noticed to be in the range of 6.45-9.38 N. The elongation recorded was 11.35, 15.12 and 18.34% for native potato, corn and water chestnut starch, respectively. However the values were observed to lower (2.32 -3.17%) in starch films prepared from HMT treated starch samples. Film forming ability of native and heat moist treated starches showed a promising future for exploration as packaging material for both food and non-food purposes.

Flow sheet for the preparation of starch films

Fig.1 Flow sheet for the preparation of starch films

Solubility of starch films in different pH conditions

Table.1 Solubility of starch films in different pH conditions

Water vapor transmission rate of starch films at 380℃ and RH 90%

Fig.2 Water vapor transmission rate of starch films at 380℃ and RH 90%

Tensile strength and % elongation of starch films at 30 ±0.50℃ and RH 65%

Fig.3 Tensile strength and % elongation of starch films at 30 ±0.50℃ and RH 65%



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