CHEMICAL COMPOSITION OF POTATO CELL WALL

Cell wall-middle lamella material free of starch granules was obtained by a purification process involving sonication to rupture unbroken cells followed by Miracloth filtration using a specially designed filtration apparatus. Potato tuber contained 1.2% (wet basis) of cell wall-middle lamella material. The material was composed of 55% pectic substance, 7% hemicellulose, 28% cellulose, and 10% protein. The isolated pectic substance contained 51% anhydrogalacturonic acid and 49% polysaccharide, while the hemicellulose contained 7% anhydrogalacturonic acid and 93% polysaccharide. The pectin polysaccharides were composed of 6.0% rhamnose, 0.6% fucose, 5.6% arabinose, 1.8% xylose, and 86.0% galactose. The hemicellulose polysaccharides were composed of 0,5% rhamnose, 2.1% arabinose, 23.1% xylose, 5.8% mannose, 12.0% galactose, and 56.7% glucose. © 1969, American Chemical Society. All rights reserved.