An Approach of Anomaly Detection and Neural Network Classifiers to Measure Cellulolytic Activity

Author(s): Luis Francisco Barbosa-Santillán, María de los Angeles Calixto-Romo*, Juan Jaime Sánchez-Escobar, Liliana Ibeth Barbosa-Santillán.

Journal Name: Combinatorial Chemistry & High Throughput Screening

Volume 21 , Issue 9 , 2018

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Abstract:

Aim and Objective: A common method used for massive detection of cellulolytic microorganisms is based on the formation of halos on solid medium. However, this is a subjective method and real-time monitoring is not possible. The objective of this work was to develop a method of computational analysis of the visual patterns created by cellulolytic activity through artificial neural networks description.

Materials and Methods: Our method learns by an adaptive prediction model and automatically determines when enzymatic activity on a chromogenic indicator such as the hydrolysis halo occurs. To achieve this goal, we generated a data library with absorbance readings and RGB values of enzymatic hydrolysis, obtained by spectrophotometry and a prototype camera-based equipment (Enzyme Vision), respectively. We used the first part of the library to generate a linear regression model, which was able to predict theoretical absorbances using the RGB color patterns, which agreed with values obtained by spectrophotometry. The second part was used to train, validate, and test the neural network model in order to predict cellulolytic activity based on color patterns.

Results: As a result of our model, we were able to establish six new descriptors useful for the prediction of the temporal changes in the enzymatic activity. Finally, our model was evaluated on one halo from cellulolytic microorganisms, achieving the regional classification of the generated halo in three of the six classes learned by our model.

Conclusion: We assume that our approach can be a viable alternative for high throughput screening of enzymatic activity in real time.

Keywords: Cellulolytic activity, neural network, anomaly detection, linear regression, high throughput screening, machine learning.

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Article Details

VOLUME: 21
ISSUE: 9
Year: 2018
Page: [681 - 692]
Pages: 12
DOI: 10.2174/1386207322666181219160406
Price: $58

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