The Potential of Controlled Atmosphere Storage to Control Tuber Bruise Development in Ranger Russet Potatoes

Abstract

The potential for controlled atmosphere (CA) storage to maintain quality of Ranger Russet potato (Solanum tuberosum L.) tubers was investigated. Before storage condition tests were initiated (time zero), potatoes were divided into two groups, bruised and non-bruised tubers. Tubers were stored (6.6 ¥C, 95% RH) in regular atmosphere (RA), 5% CO₂ 12% O₂ or 5% CO₂ 6% O₂. The assessment of tuber response to storage conditions included the evaluation of bruised and non-bruised tuber flesh color after two months of storage. Color was measured immediately after peeling, 10 and 60 minutes later, and after 24 h. The flesh color of bruised tubers, compared to non-bruised tubers at time zero, showed significant changes in lightness (L*), but not in green coloration (a*) or yellowness (b*). The bud and stem ends were equally susceptible to bruise effects as reflected by the parameters L*, a* and b*. After two months storage, RA and 5% CO₂ 6% O₂ were the best conditions to reduce the degree of darkness in bruised tubers. The 5% CO₂ 6% O₂ atmosphere reduced changes in a* values, but did not affect b* values.