بررسی ویژگی هاي فیزیکی فیلم پلی لاکتیک اسید نشانگر شده با آنتوسیانین هاي استخراج شده از کلم قرمز و چغندر لبویی.

In the present study, the properties of film markers of polylactic acid and anthocyanins extracted from red cabbage and beetroot were investigated. There were four samples of: 1 (polylactic acid without anthocyanins), 2 (polylactic acid containing red cabbage anthocyanins), 3 (polylactic acid containing beet anthocyanin) and 4 (polylactic acid containing beet anthocyanin and red cabbage). The samples were tested for thickness, solubility, mechanical properties (tensile strength, elongation at break, Young's modulus) and changes in color indices were also analyzed. The results showed that there was no statistically significant difference in the thickness of the film samples (p> 0.05). The highest solubility belonged to the sample 1 and the lowest solubility belonged to sample 4. The results of mechanical tests showed that the highest increase in elongation at breakbelonged to samples 3 and 4 and the lowest increase in elongation at breakbelonged to sample 1 (p≤0.05). The lowest tensile strength and Young's modulus belonged to sample 1 (p≤0.05). In all the film samples except sample 1, by increasing pH (up to pH = 14), L * significantly increased (p≤0.05). In addition, in all pH ranges, sample 1 had the highest L * and sample 3 had the lowest (p≤0.05). a * in sample 3, at pH = 1-6, had an increasing trend and then decreased to pH = 14 (p≤0.05). In samples 2 and 4 at pH = 1-13, a decreasing trend was observed and then up to pH = 14 an increasing trend was observed (p≤0.05). In sample 3, up to pH = 6, an increasing trend and then up to pH = 14, a decreasing trend was observed (p≤0.05). In the b * of sample 2, first at pH = 1-12, a decreasing trend was observed and then up to pH = 14, an increasing trend was observed (p≤0.05). The b * of sample 3 at pH = 1-11, and in sample 4 at pH = 1-12, showed a decreasing trend and an increasing trend for both samples up to pH = 14 (p≤0.05).Sample 4 was introduced as the best treatment due to suitable physical properties and color changes at different pH. [ABSTRACT FROM AUTHOR]