Banca de DEFESA: MARCUS VINICIUS DA SILVA FERREIRA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : MARCUS VINICIUS DA SILVA FERREIRA
DATE: 19/12/2023
TIME: 09:00
LOCAL: UFRRJ Seropedica
TITLE:

Construction of a Low-Cost Electronic Nose (E-
Nose) for Use in the Quality Control of Agricultural Products

KEY WORDS:

Olfactive sensors. optical sensors. agricultural products. machine learning.

PAGES: 157
BIG AREA: Ciências Agrárias
AREA: Ciência e Tecnologia de Alimentos
SUBÁREA: Ciência de Alimentos
SUMMARY:

The electronic nose (e-nose) is a device that tries to optimize the olfactory system of
mammalian cells and is designed to identify odors. This equipment is based on the ability of the
sensors to detect the presence of odors (volatile compounds) and transform them into an
electrical signal (voltage) (e-nose data) in the food. In the industry, the electronic nose has been
widely used for evaluation of other agricultural products, especially in fruit and vegetable
commodities, where the use of electronic nose devices has increased in recent years. Other
techniques requested in sensors, this time optics such as near infrared (NIR) and RGB image
(computer vision) are also used techniques identified in foods in order to obtain chemical
information, as with the electronic nose. Where NIR involves the interaction of light radiation
with a sample, where its physical and chemical properties are reflected resulting in the NIR
spectra. RGB, on the other hand, is a powerful technology that uses computers to extract useful
data from visual inputs (e.g., images), since the methods for phytochemical intelligence in these
cultures are costly and time- consuming chromatography/mass spectrometry, such as gas
chromatography. (CG-MS) infrared spectroscopy with the Fourier transform (FT-IR), in addition,
these methods tried the destruction of the analyte. The aim of this work was to investigate the
effect of low-cost electronic nose (NEBC) parameters (e.g., sensors temperature, chamber space,
airflow and acquisition time) by applying multivariate analysis PCA, PLSR, PLS-DA for the
evaluation of agricultural products. In addition, the investigation in the performance of the low-
cost electronic nose compared to other technologies. The NEBC proved to be a powerful
analytical tool in the classification of pitaya control stages. The potential for predicting
parameters, such as acidity and soluble solids (RPD>2) was high. Also, of black teas based on
origin (Brazil, India and United States). This performance with other optical sensors, such as
Near Infrared (NIR) (for pitaya and tea) and Image (RGB/Computer Vision) (for pitaya). The
stabilization and acquisition time of the sample in 2 minutes used both for pitaya and teas, as well
as the temperature and humidity conditions at 25 ◦C and 40%, and the headspace. The low-cost
electronic nose is thus an alternative for the food industry in the range of 300 dollars that can be
considered for quality control, such as shelf life in fruits and authentication in black tea.

COMMITTEE MEMBERS:
Externo à Instituição - Flavio Napole Rodrigues
Externo à Instituição - Cleiton Antônio Nunes
Externo ao Programa - 1723192 - ANTONIO RENATO BIGANSOLLI - nullExterno ao Programa - 3103346 - JOAO VICTOR NICOLINI - nullPresidente - 2455049 - JOSE LUCENA BARBOSA JUNIOR