Abstract
SUMMARYOptimum conditions for the reaction of food gums with the anthrone reagent vary from one gum to another. The sulfated, carboxylic acid type and mixed polysaccharides produced colors with absorption maxima at 620 mμ. The uranic acid type of polysaccharides, pectin and sodium alginate (Kelco Gel HV), produced colors exhibiting absorption maxima at 520 mμ. In all cases, color intensity increased with increasing temperature. The heating time necessary for maximum color development at 99°C varied from 4 to 10‐min, depending on the hydrocolloid in question. With pectin and sodium alginate, although color intensity increased with heating time at 99°C, no definite heating time for maximum color development was observed up to 60 min. In most cases, aging led to a rapid decrease in color intensity, except for pectin and sodium alginate, in which cases color intensity increased.
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