Wahyu Sugianto’s research while affiliated with University of Brawijaya and other places

This study aims to develop and evaluate a Multi-Frequency Bioelectrical Impedance Analysis (MFBIA) system for estimating body composition, specifically Fat-Free Mass (FFM) and Body Fat Percentage (BF%). The primary objective was to assess the accuracy and reliability of the MFBIA system by comparing its measurements with those obtained from a commercially validated Smart Body Fat analyzer and traditional anthropometric methods. The research involved regression analysis to examine the correlation between FFM and BF% measurements from MFBIA and anthropometric data, including height and weight. Additionally, impedance measurements were taken at multiple frequencies (25 kHz, 50 kHz, and 100 kHz) to determine the system's ability to estimate body composition parameters across various conditions. The results showed a strong correlation between the FFM and BF% values derived from MFBIA and those obtained using the Smart Body Fat analyzer. The regression analysis indicated high linearity, with R² values ranging from 0.9439 to 0.9692, signifying the robustness of the system in predicting body composition. Furthermore, the MFBIA system demonstrated a high degree of consistency and accuracy in measuring FFM and BF%, with minimal deviations from the reference device. This research presents a multi-frequency BIA device designed specifically to measure fat-free mass (FFM), an important indicator for assessing the nutritional status of children. The results of this research offer a practical, affordable, and non-invasive tool for healthcare providers to assess body composition in children. The MFBIA system has the ability to track nutritional status, supporting targeted interventions to promote child health and prevent stunting.

A research study requires an approach to implement research data more optimally and be easily interpretable. The PCA approach with K-means clustering is an appropriate method for clustering NaCl solution concentrations based on impedance, TDS, and conductivity parameters. The results of this method indicate that the first and second principal components with eigenvalues of 2.7208 and 1.2728, respectively, represent 68.0% and 31.8% of the total variability. Cumulatively, these two principal components account for 99.8% of the total variance. This suggests that the approach used aligns well with the tested parameters. Therefore, it can be concluded that the PCA approach with K-means clustering can be used to cluster NaCl solution concentrations, distinguishing between low and high concentrations of NaCl solutions

Kekhawatiran masyarakat mengenai dampak negatif yang ditimbulkan dari paparan radiasi elektromagnetik ini masih terus diteliti hingga saat ini. Oleh karena itu, sangat perlu dilakukan suatu studi penelitian untuk mengukur dan memetakan tingkat radiasi elektromagnetik dengan tujuan menganalisis potensi risiko yang terjadi. Paparan radiasi elektromagnetik diukur menggunakan electromagnetic field tester, kemudian hasilnya dibandingkan dengan pedoman keselamatan yang dikeluarkan oleh ICNIRP dan WHO. Hasil yang diperoleh bahwa tingkat paparan radiasi yang diukur dalam satuan mikrotesla di 29 titik lokasi di Universitas PGRI Yogyakarta jauh di bawah pedoman ICNIRP untuk lingkungan pendidikan dan kerja. Nilai medan magnet terukur tertinggi adalah 132,46 µT, sedangkan nilai medan magnet terukur terendah adalah 1,436 µT. Medan magnet diatas 0,3 hingga 0,4 µT dapat meningkatkan risiko leukimia dalam jangka panjang. Penelitian ini telah menghasilkan informasi yang bermanfaat sebagai dasar pengambilan kebijakan kesehatan di lingkungan kampus Universitas PGRI Yogyakarta

Erythrocyte quantity is one of the parameters of the physiological conditions. This case causes knowledge about the nature and amount of erythrocytes to be interesting objects of research. This paper discusses the detection of erythrocyte quantities using an interdigitated electrode by Electrical Impedance Spectroscopy (EIS) method. Impedance measurements performed by injecting a current of 10 µA in the frequency range of 100 Hz - 100 kHz. Measurement made at erythrocyte concentrations from 3.79 x 10⁴cell µL-¹ to 7.61 × 10⁶ cell µL⁻¹. The results show that increasing the number of erythrocytes will increase the impedance value exponentially. Increasing the quantity of erythrocytes can be observed well at frequencies above 1 kHz. The minimum detection limit for erythrocytes is 3.79 x 10⁴cell µL⁻¹.

Hematology is a series of blood tests carried out to identify any problems or blood disorders based on the number of cells.There is a tendency to postpone hematological examinations because of the high demand for samples to be tested. Delayed analysis of blood samples can affect the reliability and validity of hematological testing results. This research aims to determine the characteristics of the blood impedance value stored in an EDTA tube for 6 hours based on the electrical impedance spectroscopy method. The number of blood cells factor influences the characteristic of blood impedance. Measurement of whole blood cell impedance was injecting 100 µA currents into the sample at the frequency range of 1 Hz to 1 MHz. The longer the blood is stored, the higher the blood impedance value. The condition happens because of changes in blood morphology during storage. The effect of blood storage time shows a shift in the characteristic impedance value after 2 hours of storage.

Saccharin additives addition as a substitute for natural sweeteners is done to reduce production costs. This paper will discuss the effect of sweetener on the electric impedance of apple cider. The electrical impedance spectroscopy method was applied to the sample using four electrodes. Electrical impedance measurements made by injecting 100 μA currents in samples within the chamber in the frequency up to 1 MHz. The results showed that the electrical impedance value of apple cider manalagi is 1721.166 Ω to 41.870 Ω. The effect of sugar cane s mass composition and saccharin mass added to apple cider can be observed well in low frequency up to 10 kHz. The electric impedance characteristic of the apple cider manalagi increases with the addition of sugar canes mass, whereas the electric impedance value of the apple juice manalagi decreases with the addition of saccharin mass.