Noriaki SAIGA and Kenji MATSUDA

Yonago National College of Technology, Electronic Control Engineering, 4448 Hikona, Yanago, Tottori 683-8502, Japan

(Received August 31, 2008; Revised March 21, 2009; Accepted April 20, 2009)

In near-infrared spectroscopy, the detection of low glucose condensation around 100 mg/dl is extremely difficult owing to various hydrogen-bonded water clusters. Ultrasonic cavitations were effective to downsize them or reconstruct them. It was found that glucose solution attacked by cavitations had a peculiar recovery time depending on the glucose condensation until its chemical reaction approached the equilibrium. The absorbance profiles of such varying solutions manifested that their variations depended on the glucose content and the PLS regression method for them enabled estimating the glucose condensation with an accuracy of ± 16 mg/dl.

Key words: near-infrared spectroscopy, glucose, ultrasonic, cavitations, principal component regression