Phanomsophon, Thitima

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Phanomsophon, Thitima
Alternative Name
Phanomsophon, T.
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Email
thitima.ph@kmitl.ac.th

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    Evaluation of acetic acid and ethanol concentration in a rice vinegar internal venturi injector bioreactor using Fourier transform near infrared spectroscopy
    (2019-12-01)
    Phanomsophon, Thitima
    ;
    Sirisomboon, Panmanas
    ;
    Lapcharoensuk, Ravipat
    ;
    Shrestha, Bim
    ;
    Krusong, Warawut
    In the process of fermenting rice vinegar, the concentration of acetic acid and ethanol concentration must be measured for monitoring of the total concentration. Near infrared spectroscopy has been used to rapidly monitor the concentration of acetic acid and ethanol concentration daily during 10 cycles of the fermentation process. The model was developed using partial least squares regression. For predicting concentration of acetic acid with near infrared spectroscopy, the coefficient of determination (R<sup>2</sup>), root mean square error of calibration, root mean square error of cross validation, ratio of standard error of validation to standard deviation, and bias was 0.96, 2.30 g L<sup>−1</sup>, 2.44 g L<sup>−1</sup>, 1.11 g L<sup>−1</sup>, and 5.56, respectively. For ethanol concentration, the value of R<sup>2</sup>, root mean square error of calibration, root mean square error of cross validation, bias and ratio of prediction to deviation were predicted to be 0.94, 3.15 g L<sup>−1</sup>, 2.73 g L<sup>−1</sup>, −0.40 g L<sup>−1</sup>, and 4.04, respectively. However, both models provided fair performance when tested with an external set of samples, indicating that the models could be applied for rough screening.
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    Precision test for scanning of soil in durian orchard using near-infrared spectroscopy
    (2019-09-09)
    Phanomsophon, T.
    ;
    Sirisomboon, P.
    Near infrared (NIR) spectroscopy is a rapid technique for non destructive testing. Durian is popular fruit in Thailand. Growing durian is not easy. It needs to provide proper nutrients. Therefore, this paper aims to test the repeatability and reproducibility of NIR scanning before conducting the feasibility test of creating the equation to predict the N P K value in the soil for the durian trees. Results showed that the repeatability of FT-NIR spectrometer and Micro-NIR spectrometer for fresh soil were 0.064 and 0.075, respectively and for soil powder, they were 0.039 and 0.048, respectively. The reproducibility of FT-NIR spectrometer and Micro-NIR spectrometer for fresh soil were 0.048 and 0.051, respectively and for soil powder were 0.051 and 0.046, respectively.