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- W2165374291 abstract "The relationship between the “glassiness” defect in frozen French fries and the moisture, starch and reducing sugar content of the affected potato tuber was investigated. The effect of soil water quality, cultivar, soil depth, storage duration, specific gravity and blanching conditions during French fry production on the occurrence of “glassiness” was determined. Fourier transform near infrared (FT-NIR) spectroscopy was used to identify possible classifications of defected tubers. No significant difference occurred between the moisture (p=0.10, trial 1 and p=0.15, trial 2), starch (p=0.76, trial 1 and p=0.70, trial 2) or reducing sugar (p=0.05, trial 1 and p=0.51, trial 2) content of potato sample with and without the “glassiness” defect. Samples of the cultivar Herta (Her) showed the lowest occurrence of the defect (23%, trial 1 and 0%, trial 2), while the cultivar Columbus (Col) showed the highest occurrence (70%, trial 1 and 84%, trial 2). The soil water quality prevailing in the area of cultivation contributed to the amount of “glassiness” occurring in the samples of the cultivar Col. Col obtained from the Parys area (electrical capacity (EC) = 145 mS.m) showed a 21% occurrence of “glassiness”. Col obtained from the Uitvlug (EC = 57 mS.m) and Zandrug (EC = 25 mS.m) areas showed a 91% occurrence of the defect. All samples cultivated in the Parys area during trial 1 showed a significantly lower occurrence of “glassiness” (p=0.01) than samples obtained from the areas Uitvlug and Zandrug. During trial 2 all samples obtained from the Thaaibos area (EC = 82 mS.m) showed a lower occurrence of the defect than samples obtained from the area Witklip (EC = 178 mS.m) although this difference was not statistically significant (p=0.06). Soil depth, specific gravity and storage duration did not contribute to a significant difference in the occurrence of “glassiness” between samples. Modified blanching conditions of 62oC for 25 min instead of 80oC for 20 min during frozen French fry processing had a reducing effect on the occurrence of the defect in the cultivars Fianna (Fia) (p=0.06), Pentland Dell (Pen) (p=0.05)" @default.
- W2165374291 created "2016-06-24" @default.
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- W2165374291 date "2005-03-01" @default.
- W2165374291 modified "2023-09-26" @default.
- W2165374291 title "Characterisation of glassiness in commercially processed french fried potatoes" @default.
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