Laboratory-Scale Preparation of Sodium Polypectate for Use in Selective Media for Pectolytic Erwinia spp.. E. J. Cother, Agricultural Research Centre, Yanco 2703, N.S.W., Australia. A. B. Blakeney, and S. J. Lamb, Agricultural Research Centre, Yanco 2703, N.S.W., Australia. Plant Dis. 64:1086-1087. Copyright 1980 American Phytopathological Society. DOI: 10.1094/PD-64-1086.

In a laboratory method for preparing sodium polypectate from orange skins or green apples, gel consistency was substantially increased by addition of morpholinopropane sulfonic acid at 4 gm/L. Polypectates prepared in this manner produced gels with strength equal to or greater than that of Raltech pectates. Polygalacturonic acid, Na salt, from Sigma Chemical Co. failed to produce acceptable gels.

Keyword(s): 3-(N-morpholino) propane sulfonic acid.