Results (
Thai) 2:
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Colour was determined in each cheek of 20 fruitfrom each replicate
by using a Minolta colorimeter (CRC200, Minolta Camera Co.,
Japan), using the CIELab coordinates and expressed as Hue angle.
Fruit firmness was determined independently in 20 fruit of each
replicate using a TX-XT2i Texture Analyzer (Stable Microsystems,
Godalming, UK) interfaced to a personal computer, with a flat steel
plate mounted on the machine. For each fruit, the cheek diameter
was measured and then a force that achieved a 3% deformation
of the fruit diameter was applied. Results were expressed as the
force–deformation ratio (N mm−1) and were the mean ± SE. After
that the 20 fruit of each sample were cut in small pieces to obtain
a homogeneous sample for each replicate. TSS were determined
in duplicated in the juice obtained from 5 g of each sample with a
digital refractometer Atago PR-101 (Atago Co. Ltd., Tokyo, Japan) at
20 ◦C, and expressed as g 100 g−1 (mean ± SE). Total acidity (TA) was
determined in duplicated in the same juice by automatic titration
(785 DMP Titrino, Metrohm) with 0.1 N NaOH up to pH 8.1, using
1 mL of diluted juice in 25 mL distilled H2O, and results (mean ± SE)
expressed as g malic acid equivalent 100 g−1 fresh weight.
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