Ultrasound velocity and attenuation measurements achieved at
25 MHz on mango juice samples showed a great variability with
both fruit maturity at picking and ripening stage after picking in
relation to soluble solids content, fruit texture and biochemical
composition changes. Contrary to attenuation, velocity was unaffected by frequency in the frequency domain ranging from 2 to
30 MHz. Velocity was found to be more accurately estimated than
attenuation. Among the relationships involving ultrasound velocity
found in this study the very good linear relationship with soluble
solids content in agreement with the previous findings could present an alternative in the specific case of on line measurements
through opaque pipes, including stainless steel tubes. Although soluble solids content and ultrasound velocity are collinear variables,
velocity was found to bring extra information to explain variability
of sucrose content or titratable acidity of mango juices. Whatever
the number of physical variables involved in the PLS models, velocity was always considered as a significant explanatory variable.