Effect of Bean Size and Moisture Content on the Physical and Aerodynamic Characteristics of Gayo Coffee
Abstract
This study evaluated the physical and aerodynamic characteristics of Gayo Arabica and Robusta coffee beans as influenced by bean diameter and moisture content. Samples from the Gayo Highlands (900–1,700 m above sea level) were arranged in a Completely Randomized Design with two factors: diameter (<6 mm, 6–7 mm, >7 mm) and moisture content (10–15%), with three replications. Parameters measured included sphericity, mass per 100 beans, bulk and true density, porosity, terminal velocity, and drag coefficient. ANOVA and Duncan’s test (95%) were applied for statistical analysis. Bean diameter significantly affected most properties, with larger beans showing higher mass, sphericity, porosity, and terminal velocity but lower bulk density and drag coefficient. Moisture content significantly influenced mass, true density, bulk density, and aerodynamic behavior; higher moisture increased mass and terminal velocity while reducing porosity and drag coefficient. True density was unaffected by diameter. Overall, diameter governed structural, while moisture content mainly modified mass-related and aerodynamic responses.
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Abubakar, Y., Hasni, D., Muzaifa, M., & Widayat, H.P. (2019). Effect of varieties and processing practices on the physical and sensory characteristics of Gayo Arabica specialty coffee. IOP Conference Series: Materials Science and Engineering, 523(1), Article 012027. https://doi.org/10.1088/1757-899X/523/1/012027
Abubakar, Y., Siregar, M.M., Juanda, J., & Nilda, C. (2025). Cherry and bean size distribution of Gayo Arabica coffee harvested from different farm elevations. IOP Conference Series: Earth and Environmental Science, 1476, Article 012099. https://doi.org/10.1088/1755-1315/1476/1/012099
Afonso Júnior, P.C., Corrêa, P.C., Pinto, F.A.C., & Queiroz, D.M. (2007). Aerodynamic properties of coffee cherries and beans. Biosystems Engineering, 98(1), 39–46. https://doi.org/10.1016/j.biosystemseng.2007.03.010
Andini, R., Zaelani, A., Sulaiman, M.I., Sembiring, E.R., Jaya, R., Gusain, M., Bhanot, D., Morghade, R.S., Gaafar, A.-R.Z., Azis, A., & Widayat, H.P. (2025). Genetic diversity of cultivated Gayo Arabica coffee (Coffea arabica L.) based on morphological and microsatellite markers. BMC Plant Biology, 25, Article 990. https://doi.org/10.1186/s12870-025-06768-4
Corrêa, J.L.G., Pereira, L.M., Vieira, G.S., & Hubinger, M.D. (2010). Mass transfer kinetics of pulsed vacuum osmotic dehydration of guavas. Journal of Food Engineering, 96(4), 498–504. https://doi.org/10.1016/j.jfoodeng.2009.08.032
Damayanti, T., & Setiadi, H. (2019). The influence of certification of Gayo coffee geographical indication against value added of coffee in Gayo Highlands, Aceh. IOP Conference Series: Earth and Environmental Science, 338(1), Article 012028. https://doi.org/10.1088/1755-1315/338/1/012028
de Araujo, M.E.V., Corrêa, P.C., Barbosa, E.G., & Martins, M.A. (2021). Determination and modeling of physical and aerodynamic properties of coffee beans (Coffea arabica) during the drying process. Journal of Food Processing and Preservation, 45(9), Article e15698. https://doi.org/10.1111/jfpp.15698
Erika, C., Muzakki, F., Yusriana, & Yunita. (2025). Physical properties of Arabica green coffee beans grown at different farm elevations in Gayo Highland, Indonesia. IOP Conference Series: Earth and Environmental Science, 1476, Article 012096. https://doi.org/10.1088/1755-1315/1476/1/012096
Fadai, N.T., Melrose, J., Please, C.P., Schulman, A., & Van Gorder, R.A. (2017). A heat and mass transfer study of coffee bean roasting. International Journal of Heat and Mass Transfer, 104, 787–799. https://doi.org/10.1016/j.ijheatmasstransfer. 2016.08.083
Fadli, Nasution, Z., Lubis, S.N., & Aritonang, E.Y. (2024). The impact of sustainable certification on Arabica coffee’s competitiveness and regional development in Aceh, Indonesia. Journal of Ecohumanism, 4(1), 76–85. https://doi.org/10.62754/joe.v4i1.4089
Gottstein, V., Krumbügel, K., Kuballa, T., Schwarz, S., Walch, E., Walch, P., & Lachenmeier, D.W. (2023). Monitoring of chemical changes in coffee beans during the roasting process using different roasting technologies with nuclear magnetic resonance spectroscopy. Beverages, 9(4), Article 87. https://doi.org/10.3390/beverages9040087
Juanda, J., Muzaifa, M., Martunis, M., & Wahyuningsih, T. (2022). Analysis of Gayo wine-coffee processing facility development. IOP Conference Series: Earth and Environmental Science, 951(1), Article 012094. https://doi.org/10.1088/1755-1315/951/1/012094
Karim, A., Hifnalisa, H., Jufri, Y., Hidayanti, H., & Rosmaiti, R. (2024). Improvement in the physical quality of genotype G1 Arabica coffee beans as a result of applying rice husk ash and KCl fertilizer. IOP Conference Series: Earth and Environmental Science, 1356(1), Article 012020. https://doi.org/10.1088/1755-1315/1356/1/012020
Karim, A., Syakur, S., & Hifnalisa, H. (2023). Farmers coping strategies to climate change in sustainable Arabica coffee production. IOP Conference Series: Earth and Environmental Science, 1183(1), Article 012097. https://doi.org/10.1088/1755-1315/1183/1/012097
Mariyudi, Suryadi, Sayuti, M., & Raza, H. (2018). Analysis the competitive advantage of Arabica Gayo coffee organic in Indonesia. Indian Journal of Public Health Research & Development, 9(11), 1359–1363. https://doi.org/10.5958/0976-5506.2018.02264.7
Muzaifa, M., Abubakar, Y., & Nilda, C. (2024). Physicochemical and sensory profile of commercial wine coffee in the Gayo Highlands, Indonesia. Coffee Science, 19, Article e2168. https://doi.org/10.25186/.v19i.2168
Muzaifa, M., Nilda, C., & Abubakar, Y. (2023). Physicochemical characteristics of wine coffee, a recent popular coffee product from Gayo Highland-Indonesia. Rasayan Journal of Chemistry, 16(3), 1789–1795. https://doi.org/10.31788/RJC.2023.1638404
Salasamuharram, F., Hamid, A. H., Zikria, V., Ginting, L. N., Zulkarnain, Z., Marsudi, E., & Baihaqi, A. (2024). Mitigation of Gayo Arabica coffee supply chain risk using the house of risk method in Aceh Tengah. IOP Conference Series: Earth and Environmental Science, 1297(1), Article 012064. https://doi.org/10.1088/1755-1315/1297/1/012064
Saputri, M., Lioe, H.N., & Wijaya, C.H. (2020). Pemetaan karakteristik kimia biji kopi Arabika Gayo dan Robusta Gayo [Mapping the chemical characteristics of Gayo Arabica and Robusta green coffee beans]. Jurnal Teknologi dan Industri Pangan, 31(1), 76–85. https://doi.org/10.6066/jtip.2020.31.1.76
Silaban, R., Sinaga, H., & Karo-Karo, T. (2023). Pengaruh jenis kemas terhadap karakteristik fisikokimia dan sensorik kopi Arabika Gayo dengan metode pengolahan semi basah. Jurnal Teknologi Pangan dan Hasil Pertanian, 18(2), 122–135. https://doi.org/10.26623/jtphp.v18i2.7259
Sinaga, S.H., & Julianti, E. (2021). Physical characteristics of Gayo Arabica coffee with semi-washed processing. IOP Conference Series: Earth and Environmental Science, 782(3), Article 032093. https://doi.org/10.1088/1755-1315/782/3/032093
Sunarharum, W.B., Mahatmanto, T., Ali, D.Y., Prananto, Y.P., Efrat, N., Asih, N.E., & Mirillia, N.G. (2022). Sensory and physicochemical characteristics of two common roast defects in Robusta coffee. International Journal on Advanced Science, Engineering and Information Technology, 12(1), 536–545. https://doi.org/10.18517/ijaseit.12.1.13805
Tsai, S.-Y., Hwang, B.-F., Wang, S.-P., & Lin, C.-P. (2017). A kinetics study of coffee bean of roasting and storage conditions. Journal of Food Processing and Preservation, 41(4), Article e13040. https://doi.org/10.1111/jfpp.13040
Wang, X., & Lim, L.-T. (2015). Physicochemical characteristics of roasted coffee. In V.R. Preedy (Ed.), Coffee in health and disease prevention (pp. 247–254). Academic Press. https://doi.org/10.1016/B978-0-12-409517-5.00027-9
Wei, F., & Tanokura, M. (2015). Chemical changes in the components of coffee beans during roasting. In V.R. Preedy (Ed.), Coffee in health and disease prevention (pp. 83–91). Academic Press. https://doi.org/10.1016/B978-0-12-409517-5.00010-3
Yusibani, E., Ikramullah, I., Yufita, E., Jalil, Z., & Suhendi, E. (2023). The effect of temperature and roasting time on the physical properties of Arabica and Robusta Gayo coffee bean. Journal of Applied Agricultural Science and Technology, 7(2), 100–108. https://doi.org/10.55043/jaast.v7i2.75
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