and temperature and that this auto hydrolytic thinning action during heating of the pasted product is sufficient to thin the starch derivative canning media partially or completely as desired blends of several root and root type starch derivatives make possible a predictable final viscosity level which is not completely 34 water thin 34 the selection of acetylating agent also affects the final viscosity level of the starch canning medium it has been observed that a starch derivative substitute using vinyl acetate provides a slightly higher final viscosity under the same retorting conditions when compared to a starch derivative which has been substituted using acetic anhydride application_number US 61777075 A description tapioca starch in 40 aqueous slurry at room temperature 70 u00b0 80 u00b0 f was reacted with 7 5 vinyl acetate for 30 minutes using 1 85 tribasic sodium phosphate as a catalyst slurry ph was then adjusted to 3 0 and stirred for 25 minutes forming some distarch acetal links from acetaldehyde generated during the acetylation reaction the slurry was then adjusted to ph 5 the starch filtered washed and dried the above process was repeated but waxy maize was used instead of tapioca as the base starch the above products were analyzed for acetyl and were subjected to brabender viscosity tests and continuous retort evaluation the results are summarized below in table i table 1______________________________________ internal can past temp u00b0 f ing peak 30 min continuoussample acetyl.