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Open AccessArticle

Analysis of the Acid Detergent Fibre Content in Turnip Greens and Turnip Tops (Brassica rapa L. Subsp. rapa) by Means of Near-Infrared Reflectance

1
Department of Plant Breeding, Institute for Sustainable Agriculture (CSIC), 14004 Córdoba, Spain
2
Department of Food Science and Technology, University of Córdoba, Rabanales Campus, 14014 Córdoba, Spain
3
Department of Plant Genetics, Biological Mission of Galicia (CSIC), 36143 Pontevedra, Spain
*
Author to whom correspondence should be addressed.
This work is a chapter of Dr. Sara Obregón-Cano’s PhD thesis.
Foods 2019, 8(9), 364; https://doi.org/10.3390/foods8090364
Received: 30 June 2019 / Revised: 19 August 2019 / Accepted: 21 August 2019 / Published: 26 August 2019
(This article belongs to the Special Issue The Health Benefits of Fruits and Vegetables)
Standard wet chemistry analytical techniques currently used to determine plant fibre constituents are costly, time-consuming and destructive. In this paper the potential of near-infrared reflectance spectroscopy (NIRS) to analyse the contents of acid detergent fibre (ADF) in turnip greens and turnip tops has been assessed. Three calibration equations were developed: in the equation without mathematical treatment the coefficient of determination (R2) was 0.91, in the first-derivative treatment equation R2 = 0.95 and in the second-derivative treatment R2 = 0.96. The estimation accuracy was based on RPD (the ratio between the standard deviation and the standard error of validation) and RER (the ratio between the range of ADF of the validation as a whole and the standard error of prediction) of the external validation. RPD and RER values were of 2.75 and 9.00 for the treatment without derivative, 3.41 and 11.79 with first-derivative, and 3.10 and 11.03 with second-derivative. With the acid detergent residue spectrum the wavelengths were identified and associated with the ADF contained in the sample. The results showed a great potential of NIRS for predicting ADF content in turnip greens and turnip tops. View Full-Text
Keywords: Brassica rapa; turnip greens; turnip tops; acid detergent fibre; NIRS Brassica rapa; turnip greens; turnip tops; acid detergent fibre; NIRS
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Obregón-Cano, S.; Moreno-Rojas, R.; Jurado-Millán, A.M.; Cartea-González, M.E.; De Haro-Bailón, A. Analysis of the Acid Detergent Fibre Content in Turnip Greens and Turnip Tops (Brassica rapa L. Subsp. rapa) by Means of Near-Infrared Reflectance. Foods 2019, 8, 364.

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