Probiotics Production: An Interesting Example for the Undergraduate Analytical Chemistry Laboratory

“…Glucuronic acid is a metabolite of the fermentative degradation produced by Kombucha, a combination of a yeast (Schizosacaromyces pombe) and a bacteria (Acetobacter xylimun), which constitutes a generous probiotic producer [28,29]. The pH of all solutions was set to 4.0 by adding acetic acid.…”

Section: Experimental Data Setsmentioning

confidence: 99%

“…The first set consists of aqueous solutions of commercial black tea, glucose, gluconic acid and glururonic acid, aimed at modelling the concentration of the last component. Glucuronic acid is a metabolite of the fermentative degradation produced by Kombucha, a combination of a yeast (Schizosacaromyces pombe) and a bacteria (Acetobacter xylimun), which constitutes a generous probiotic producer [28,29]. The pH of all solutions was set to 4.0 by adding acetic acid.…”

Section: Experimental Data Setsmentioning

confidence: 99%

A new family of genetic algorithms for wavelength interval selection in multivariate analytical spectroscopy

Goicoechea

Olivieri

2003

Journal of Chemometrics

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A new procedure is presented for wavelength interval selection with a genetic algorithm in order to improve the predictive ability of partial least squares multivariate calibration. It involves separately labelling each of the selected sensor ranges with an appropriate inclusion ranking. The new approach intends to alleviate overfitting without the need of preparing an independent monitoring sample set. A theoretical example is worked out in order to compare the performance of the new approach with previous implementations of genetic algorithms. Two experimental data sets are also studied: target parameters are the concentration of glucuronic acid in complex mixtures studied by Fourier transform mid-infrared spectroscopy and the octane number in gasolines monitored by nearinfrared spectroscopy.

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“…Es un sistema muy simple, fácil de manipular, resistente a la contaminación e inocuo. Para estudiar la evolución de este bioproceso durante siete días, se realizaron las siguientes determinaciones en diferentes tiempos prefijados: pH, acidez, glucosa, biomasa inicial y final (Goicoechea et al, 2000).…”

Section: Metodologíaunclassified

El desafío de la calidad : un mensaje pedagógico básico para el trabajo experimental en química analítica

Mantovani¹,

Rodil²,

Cámara³

et al. 2003

ensciencias

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Resumen. El trabajo se orienta hacia el logro del mejoramiento de la enseñanza experimental en el laboratorio de química analítica y se realiza desde el modelo de la investigación-acción. La química analítica es una actitud intelectual y se la considera una disciplina científica; la enseñanza de su teoría y de la programación del análisis mediante la aplicación del proceso analítico tiene, como objetivo pedagógico básico, generar una actitud intelectual. Se presenta un enfoque conceptual del proceso analítico total para la enseñanza experimental, orientada para que el estudiante aprenda a obtener información analítica de calidad. Se reúnen y evalúan diferentes prácticos en el laboratorio, de complejidad creciente, analizándose los resultados de las experiencias. El desafío pedagógico invita a revisar con profundidad la concepción sobre la educación permanente en química analítica y, en particular, del trabajo experimental, dado que las nuevas tecnologías sufren rápidos cambios y generalmente no son utilizadas en su máximo rendimiento. Palabras claves. Química analítica, prácticos de laboratorio, calidad en el laboratrorio.Summary. The aim of this work is to improve the experimental teaching in Analytical Chemistry Labs. It is being developed from the investigation-action model. Analytical Chemistry is an intelectual attitude. We think about it as a scientific subject. The basic pedagogic aim of teaching theory and programming the analysis applying the analytical process is to incorporate it into mental structures. A conceptual approach to complete analytical process in experimental teaching is shown. The student is guided to obtain qualified analytical information. Different practical works of increasing complexity are gathered and evaluated. The results of these experiencies are analysed. The pedagogic challenge is to revise thoroughly the understanding of everyday teaching in Analytical Chemistry. Specially experimental work, since new technologies undergo quick changes and they are not always efficiently applied.

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Probiotics Production: An Interesting Example for the Undergraduate Analytical Chemistry Laboratory

Cited by 3 publications

References 1 publication

Monitoring substrate and products in a bioprocess with FTIR spectroscopy coupled to artificial neural networks enhanced with a genetic-algorithm-based method for wavelength selection

Monitoring substrate and products in a bioprocess with FTIR spectroscopy coupled to artificial neural networks enhanced with a genetic-algorithm-based method for wavelength selection

A new family of genetic algorithms for wavelength interval selection in multivariate analytical spectroscopy

El desafío de la calidad : un mensaje pedagógico básico para el trabajo experimental en química analítica

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