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The relationship between rapeseed chlorophyll, rapeseed oil chlorophyll and percentage green seeds

1982; Wiley; Volume: 59; Issue: 1 Linguagem: Inglês

10.1007/bf02670060

1558-9331

J. K. Daun,

Edible Oils Quality and Analysis

Abstract Oils with high levels of chrlorphyll have become a major problem in the Canadian crushing industry. It was not possible to compare visually the color of samples of rapeseed oil from various crushing plants in Western Canada with the nickel sulfate standard used as a trade standard. Comparison was easy using samples of oil prepared from seed in the laboratory. The difficulty in comparison was probably caused by conversion of green‐colored chlorophyll to russet‐colored pheophytin in the crushing process. An “apparent chlorophyll” standard with a maximum of 20 ppm (measured by AOCS Cc 13d‐55) is recommended. The “percentage green seed” count used in the Canadian grading system was found to correlate poorly (r 2 <05) with the chlorophyll level in the seed or oil. A maximal chlorophyll level of 12 ppm was found to be allowable in the top grade of seed. It is recommended that a rapid, accurate and inexpensive procedure for chlorophyll measurement be developed to supplement the grading system.