Excerpt from
The Canning Process:
Old Preservation Technique Goes Modern
by Dale Blumenthal
The steamboat Bertrand was heavily laden with provisions when it set out on
the Missouri River in 1865, destined for the gold mining camps in Fort
Benton, Mont. The boat snagged and swamped under the weight, sinking to the
bottom of the river. It was found a century later, under 30 feet of silt a
little north of Omaha, Neb.
Among the canned food items retrieved from the Bertrand in 1968 were brandied
peaches, oysters, plum tomatoes, honey, and mixed vegetables. In 1974,
chemists at the National Food Processors Association (NFPA) analyzed the
products for bacterial contamination and nutrient value. Although the food
had lost its fresh smell and appearance, the NFPA chemists detected no
microbial growth and determined that the foods were as safe to eat as they
had been when canned more than 100 years earlier.
The nutrient values varied depending upon the product and nutrient. NFPA
chemists Janet Dudek and Edgar Elkins report that significant amounts of
vitamins C and A were lost. But protein levels remained high, and all calcium
values "were comparable to today's products."
NFPA chemists also analyzed a 40-year-old can of corn found in the basement
of a home in California. Again, the canning process had kept the corn safe
from contaminants and from much nutrient loss. In addition, Dudek says, the
kernels looked and smelled like recently canned corn.