Nutrient composition of white rose potatoes during growth and after storage

Effect of maturity and storage on ascorbic acid and tyrosine concentrations and enzymic discoloration of potatoes

“…In the next harvest losses of approximately 6% for the Ontario cultivar and 7% for the Pontiac cultivar were observed; the ascorbic acid concentration of tubers in the final two harvests did not change significantly (p < 0.05) for the Ontario cultivar, but the final harvest resulted in significantly (p < 0.05) lower ascorbic acid concentration for the Pontiac cultivar. These results are in agreement with those of Yamaguchi et al (1960), who found that the ascorbic acid content of tubers increased during growth and decreased during storage, and those of Shaker et al (1978), who showed that during growth two distinct phases could be observed, the first phase showing an increase in ascorbic acid content with growth and development of tuber, followed by the second phase in which a decrease in ascorbic acid content was observed with increasing maturity.…”

Vitamins C, B1, and B2 Contents of Stored Fruits and Vegetables as Determined by High Performance Liquid Chromatography

“…2) and the regression is described in Table 4. Contents of 'Superior', as reported for 'White Rose' (17), did not change significantly. On the other end of the spectrum, an increase has been noted with 'Triumph' and 'Irish Cobbler' during 24 weeks of storage (10).…”

Development, growth and chemical composition of the potato crop (solanum tuberosum L.). II. Tuber and whole plant

“…Calculations based on results of Yamaguchi et al (1960) show similar courses of the content of niacin and ascorbic acid during tuber growth. At tuber initiation, contents of 3.9 mg niacin 100 g-1 DM are usually obtained.…”

“…The course of the concentrations of nitrate, calcium, sodium, iron, boron and aluminium is very different throughout the vegetation period (Yamaguchi et al, 1960: Sanders et al, 1972 Potato Research 40 (1997) tubers amounts more than 300 mg (nitrate-N in 1 kg DM) and it can drop to less than 60 mg in 20 days. Dependant upon the nutrient availability of the soil, the nitrate content and also that of other minerals can change enormously during the later part of the growing season.…”