The difference of pH at day 1 and day 4 could be partially due to the pH difference of coating solutions (deionized water: pH 7.00; 2% chitosan: pH 5.07; 1% CaCl2: pH 6.06; 1% CaCl2 þ 2% chitosan: pH 4.32).
The difference of pH at day 1and day 4 could be partially due to the pH difference of coatingsolutions (deionized water: pH 7.00; 2% chitosan: pH 5.07; 1%CaCl2: pH 6.06; 1% CaCl2 þ 2% chitosan: pH 4.32).