Shelf-life of prepeeled potato cultivated, stored, and processed by various methods.
The effects of cultivation conditions, winter storage, peeling method, browning prevention chemicals replacing sodium bisulfite, and packing methods on the sensory, nutritional and microbiological quality of pre-peeled potato were examined. Two different cultivation lots of the potato variety Van Gogh were used. Cultivation and harvesting conditions and peeling method were the most important facts reducing the sensory quality, especially the appearance, of prepeeled and sliced potatoes. Cooking and baking of potatoes decreased the appearance defects detected in raw potatoes. The levels of vitamin C in packaged samples decreased during winter storage. Cooking for 10 min and keeping potatoes at 60 degrees C for 1 h after cooking also decreased the content of vitamin C. In potato samples immediately after treatments aerobic bacteria were present at levels of 400 to 2,950 CFU/g and lactic acid bacteria at levels of 8 to 16 CFU/g. The number of aerobic bacteria did not increase during storage, and the number of lactic acid bacteria increased at the most to 90 CFU/g. Peeling, washing and packaging methods, cultivation conditions, and winter storage did not have important effects on the number of microbes present.
Ahvenainen
R T
RT
VTT Biotechnology and Food Research, Espoo, Finland.
Hurme
E U
EU
Hägg
M
M
Skyttä
E H
EH
Laurila
E K
EK
D001205:Ascorbic Acid / Q000032:analysis; D001420:Bacteria, Aerobic / Q000302:isolation & purification; D015169:Colony Count, Microbial; D004755:Enterobacteriaceae / Q000302:isolation & purification; D005511:Food Handling; D005519:Food Preservation / Q000379:methods*; D005520:Food Preservatives; D007778:Lactobacillus / Q000302:isolation & purification; D011198:Solanum tuberosum / Q000382:microbiology*; D013431:Sulfates; D013696:Temperature
D005520:Food Preservatives; D013431:Sulfates; C012036:sodium sulfate; D001205:Ascorbic Acid