Ralston Purina Company, St. Louis, MO. 63199.
Salt, Moisture and Aging Time Effects on the Viability of Trichinella spiralis in Pork Hams and Shoulders
Article first published online: 25 AUG 2006
Journal of Food Science
Volume 33, Issue 4, pages 417–419, July 1968
How to Cite
GAMMON, D. L., KEMP, J. D., EDNEY, J. M. and VARNEY, W. Y. (1968), Salt, Moisture and Aging Time Effects on the Viability of Trichinella spiralis in Pork Hams and Shoulders. Journal of Food Science, 33: 417–419. doi: 10.1111/j.1365-2621.1968.tb03641.x
The investigation reported in this paper (67-s-103) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with approval of the Director.
- Issue published online: 25 AUG 2006
- Article first published online: 25 AUG 2006
- Ms. accepted 3/28/68.
SUMMARY– Twenty-four weanling pigs were infested with Trichinella spiralis, by dosing with trichina larvae. The hogs were raised to market weight and slaughtered. Lean samples from each ham and shoulder were digested in a pepsin-HCI solution and microscopically examined. The samples contained respectively an average of 192 and 175 larvae per gram.
The hams and shoulders were dry-cured for 2 days per pound, using 8 pounds of cure per 100 pounds of meat. The mixture contained salt, sugar, potassium nitrate, and sodium nitrite. After being cured, the meat was hung for 30 days for salt equalization, rinsed, allowed to dry, smoked for approximately 24 hr at 90 to 100°F, and aged at 75°F.
Cores were taken from randomly selected hams and shoulders at weekly intervals and analyzed for salt and moisture while part was digested and examined for live trichinae. Live trichinae persisted through the curing and salt equalization periods but began to be reduced in number after one week of aging. Samples taken from hams and shoulders aged for one month were found to be void of any live trichina larvae.
Meat from similar samples was force-fed to rats for 5 days. After 8 weeks the rats were sacrificed and the carcasses digested and examined. No trichina larvae were found.