THE MODIFICATION OF STARCH BY HIGH-PRESSURE .2. COMPRESSION OF STARCH WITH ADDITIVES

Dry and wet starch containing 2, 5, 10, 15, 18, 20 and 22 % of humidity was compressed under 0.8, 1.0 and 1.2 X 10(9) Pa. Also starch containing chlorides of sodium, calcium barium, tin(II), zinc, copper(II), cobalt(II) and iron(III) as well as molecular iodine and all sodium fluoride, bromide, iodide, phosphate, sulfate and rhodanide was similarly compressed. It was found that humidity accelerates the destruction of starch matrix. Among mineral additives only cobaltous and ferric chlorides as well as iodine corraborate with high pressure in the deterioration of starch matrix.