Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 300301
Title Non-destructive evaluation of internal quality of radish tubers using specific gravity, X-ray analysis and near infrared spectroscopy
Author(s) Marcelis, L.F.M.; Burg, W.J. van der; Frankhuizen, R.; Verkerke, D.R.; Aartse, J.W.; Boekestein, A.
Source Acta Horticulturae 379 (1995). - ISSN 0567-7572 - p. 527 - 535.
Department(s) Research Institute for Agrobiology and Soil Fertility
Publication type Refereed Article in a scientific journal
Publication year 1995
Abstract One of the main determinants of the internal quality of radish tubers (Raphanus sativus L. var. radicula Pers.) is sponginess. Sponginess is a physiological disorder that is characterized by dead cells in which gas embolism is formed. Eventually this may lead to totally hollow tubers. Up to now the degree of sponginess has been determined by visually comparing the transversely cut tuber with a series of photographs of spongy tubers. This method is subjective, destructive and time-consuming. Therefore, an objective, non-destructive and rapid method is desired to determine the degree of sponginess. In this preliminary study some of these methods were tested, including (1) measurement of specific gravity, (2) X-ray analysis and (3) near infrared spectroscopy. Two batches of 50 tubers were analysed by all three methods. Finally, the degree of sponginess was determined visually by comparing the transversely cut tubers with a standard series of photographs. The visually estimated relative area of spongy tissue was highly correlated with specific gravity (R=-0.92) as well as X-ray analysis (R=0.87) and correlated reasonably well with near infrared reflectance (R=0.73) and transmittance (R=0.66). When sponginess led to hollowness of the tubers the specific gravity was reduced, but the X-ray technique did not discriminate between spongy tissue with and spongy tissue without hollows, while the near infrared spectroscopy tended to predict a lower degree of sponginess when the spongy tissue showed hollows. Advantages and disadvantages of each method are discussed
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