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Assessment of quality criteria of stored rapeseed—A multivariate study

1978; Elsevier BV; Volume: 14; Issue: 2-3 Linguagem: Inglês

10.1016/0022-474x(78)90007-3

1879-1212

J. T. Mills, R. N. Sinha, H. A. H. Wallace,

Insect and Pesticide Research

Criteria used by commercial grain handlers and scientists to assess rapeseed quality were compared and patterns of relationship identified by principal component analysis (PCA) based on 28 variables of 106 samples of Brassica napus L. cv. Midas and 71 of B. campestris L. cv. Torch. The seeds were obtained from primary elevators across the rapeseed-growing belt of western Canada and assessed as sound, spoiled or heated. The first principal components, accounting for 36.5 to 31.3% of the variability, revealed a relationship among fat acidity value (FAV) and conductivity, color of crushed seeds, and seed germination. The analyses also showed that appearance and smell of crushed seeds, used by elevator managers in western Canada, are reliable methods for determining rapeseed quality. In the laboratory, the most reliable criteria for judging low quality rapeseed in both species are high FAV and conductivity levels, low pH, weathered seed surfaces, brown seeds and a sour spoilage smell when crushed, many dead seeds and a high frequency of Aspergillus spp. The second components, accounting for about 10% of the variability, primarily represented the mite fauna and their niche requirements.