Electrical Impedance Spectroscopy for Moisture and Oil Content Prediction in Oil Palm ( Elaeis guineensis Jacq.) Fruitlets

The global palm oil industry is targeting an increased oil extraction rate in oil palm milling to meet global demand. This can be achieved through the certification of mills and adherence to bunch grading as part of ensuring that only high-quality and ripe fresh fruit bunches are accepted and proces...

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Bibliographic Details
Published in:Plants (Basel) 2022-12, Vol.11 (23), p.3373
Main Authors: Chin-Hashim, Nur Fizura, Khaled, Alfadhl Yahya, Jamaludin, Diyana, Abd Aziz, Samsuzana
Format: Article
Language:English
Subjects:
Correlation coefficient
Correlation coefficients
Drying ovens
ECG
EKG
Elaeis guineensis
Electric currents
Electrical impedance
Electrocardiography
Food quality
Frequency analysis
Fruit
Fruits
Impedance
Impedance measurement
Impedance spectroscopy
Methods
Mills
Moisture content
Moisture effects
NMR
Nondestructive testing
Nuclear magnetic resonance
oil content
Oil palm
Palm oil
Petroleum industry
Physiological aspects
Spectroscopy
Spectrum analysis
Statistical analysis
Variance analysis
Vegetable oils
Water content
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Summary:The global palm oil industry is targeting an increased oil extraction rate in oil palm milling to meet global demand. This can be achieved through the certification of mills and adherence to bunch grading as part of ensuring that only high-quality and ripe fresh fruit bunches are accepted and processed at all mills. However, the current grading process requires the analysis of oil palm bunches, which is laborious and tedious or prone to error due to human subjectivity. This paper introduces a non-destructive technique to predict the moisture and oil content in oil palm fruitlets using electrical impedance spectroscopy. In total, 90 samples of oil palm fruitlets at different stages of ripeness were acquired. Electrical impedance measurement of each fruitlet was done using electrocardiogram (ECG) electrodes connected to an LCR meter at frequencies of 1 kHz, 10 kHz, 20 kHz, and 100 kHz. The actual oil content in the fruitlets was determined using the Soxhlet extraction method, while the actual moisture content was determined using a standard oven-drying method. The variation of electrical impedance values at each frequency was analyzed. At 100 kHz, the correlation coefficients relating the electrical impedance to the moisture and oil content were around -0.84 and 0.80, respectively. Predictions of the moisture and oil content using linear regression of the impedance measurements at 100 kHz gave RMSE values of 5.85% and 5.71%, respectively. This information is useful for oil palm fruit grading and oil yield production estimation in the palm oil industry.
ISSN:2223-7747
2223-7747
DOI:10.3390/plants11233373