ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Characterization of carrot cultivars by spectrocolorimetry

Geoffriau E.; Dubois C.; Granger J. and Briard M.

5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004, p.119

2004

บทคัดย่อ

Colour and its homogeneity are an important factor of visual quality of carrots. The characterization of colour is important, for the appreciation of quality inside the orange cultivated type or for the assessment of accessions with various colours. The quantification of pigments by HPLC is a tedious task and a rapid method would be useful. Colorimetry based o­n the L*, a*, b* colour space coordinates of Hunter has been widely used with various success. In order to obtain a more precise information, we used a spectrocolorimeter which provides the colour spectrum.

Samples of 20 stored carrots form several cultivars were analyzed. Spectra of the external, phloem and xylem parts were recorded. Significant differences were found among cultivars. The analysis of spectra allowed to assess the uniformity of carrots inside a cultivar. Moreover, we analyzed the spectra at specific wavelengths corresponding to the maximum absorbance of the pigments responsible for colour in carrot in order to better evaluate the observed variation and potentially find a relationship with the pigment content in carrot tissues. The spectrocolorimeter proved to be a useful tool to assess the colour in carrots with a higher precision.