Pestyn perunan säilyvyys neularei'itetyssä muovissa

Authors

• Anita Ellala Elintarvikekemian ja -teknologian laitos, Helsingin yliopisto
• Lasse Vanhanen Elintarvikekemian ja -teknologian laitos, Helsingin yliopisto
• Rakel Kurkela Elintarvikekemian ja -teknologian laitos, Helsingin yliopisto

DOI: https://doi.org/10.23986/afsci.71769

Abstract

The storage life of washed potatoes packed in paper bags and micro-perforated plastic bags was investigated. The potatoes, which were of the varieties Alfa, Bintje, Patrones, Realta, Record and Sirtema, were grown in the fields of the Rootsugar Factory of East Finland (Itä-Suomen Raakasokeritehdas Oy, Kotka) in 1968. The effects of fertilizing and illumination were also studied. The results showed that the storage life of high-quality washed potatoes packed either in paper bags or in pigmented micro-perforated polyethylene bags (distance between holes 12 mm and diameter of holes 0.1 mm) was three weeks at 10 °C and two weeks at 22 °C. During this time their keeping quality equalled that of the unwashed control material stored at 4 °C. Potatoes kept in these packages under diffuse daylight at 22 °C were acceptable for food purposes for three weeks, which is sufficient for marketing purposes. The greening of potatoes kept under fluorescence light reduced their storage life. Potatoes of originally low quality, due to heavy fertilization or infected seed, very quickly became unacceptable for food purposes in any kind of package.