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    Rapid analyses of dry matter content and carotenoids in fresh cassava roots using a portable visible and near infrared spectrometer (Vis/NIRS)

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    Date
    2017-12-11
    Author
    Ikeogu, Ugochukwu N.
    Davrieux, Fabrice
    Dufour, D.L.
    Ceballos, H.
    Egesi, Chiedozie N.
    Jannink, Jean-Luc
    Type
    Journal Article
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    Abstract/Description
    Portable Vis/NIRS are flexible tools for fast and unbiased analyses of constituents with minimal sample preparation. This study developed calibration models for dry matter content (DMC) and carotenoids in fresh cassava roots using a portable Vis/NIRS system. We examined the effects of eight data pre-treatment combinations on calibration models and assessed calibrations on processed and intact root samples. We compared Vis/NIRS derived-DMC to other phenotyping methods. The results of the study showed that the combination of standard normal variate and de-trend (SNVD) with first derivative calculated on two data points and no smoothing (SNVD+1111) was adequate for a robust model. Calibration performance was higher with processed than the intact root samples for all the traits although intact root models for some traits especially total carotenoid content (TCC) (R2c = 96%, R2cv = 90%, RPD = 3.6 and SECV = 0.63) were sufficient for screening purposes. Using three key quality traits as templates, we developed models with processed fresh root samples. Robust calibrations were established for DMC (R2c = 99%, R2cv = 95%, RPD = 4.5 and SECV = 0.9), TCC (R2c = 99%, R2cv = 91%, RPD = 3.5 and SECV = 2.1) and all Trans β-carotene (ATBC) (R2c = 98%, R2cv = 91%, RPD = 3.5 and SECV = 1.6). Coefficient of determination on independent validation set (R2p) for these traits were also satisfactory for ATBC (91%), TCC (88%) and DMC (80%). Compared to other methods, Vis/NIRS-derived DMC from both intact and processed roots had very high correlation (>0.95) with the ideal oven-drying than from specific gravity method (0.49). There was equally a high correlation (0.94) between the intact and processed Vis/NIRS DMC. Therefore, the portable Vis/NIRS could be employed for the rapid analyses of DMC and quantification of carotenoids in cassava for nutritional and breeding purposes.
    https://doi.org/10.1371/journal.pone.0188918
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/2432
    Non-IITA Authors ORCID
    Dominique Dufourhttps://orcid.org/0000-0002-6046-0741
    Hernan Ceballoshttps://orcid.org/0000-0002-8744-7918
    Digital Object Identifier (DOI)
    https://doi.org/10.1371/journal.pone.0188918
    Agrovoc Terms
    Cassava; Manihot Esculenta; Carotenoids; Infrared Spectrophotometry; Specific Gravity; High Performance Liquid Chromatography; Cloning; Phenotypes; Carotenoides; Espectroscopia Infrarroja; Peso Específico; Cromatografía Líquida De Alta Resolución; Cromatografía Líquida Alta Presión; Clonación
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    PLoS ONE
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    • Journal and Journal Articles5283
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