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Abstract
This research aimed to determine relationships between weight and several physic-mechanical properties of coffee grains. Grains having 12.2% (wet basis) moisture content in average, originated from cherries of different ripening levels identified by green, yellow, red and deep red in colors were used for experiment. Research used regresi linear analysis. Results of experiment indicated that weight of grains positively correlated to length, width, thickness and frontal area with very high values of determination coefficient. Weight of grains correlated positively to sphericity and negatively to porosity. Weight of grains originated from green and red cherries had positive correlation with density whereas weight of grains originated from yellow and deep red cherries possessed no correlation with density. Weight of grains from yellow, red and deep red cherries had negative correlation with true density in contrast weight of grains from green cherries had positive correlation with true density. There were no reliable trend concerning the relationships between weight of grains and coefficient of static friction and angle of repose.
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References
Aydin, C. 2007. Some Engineering Properties of Peanut and Kernel. Journal of Food Engineering 79 (3) : 810 – 816.
Baryeh, E.A. 2001. Physical Properties of Bambara Groundnuts. Journal of Food Engineering 47 (4) : 321 – 326.
Co?kuner, Y and E. Karababa, 2005. Physical properties of coriander seeds (Coriandrum sativum L.). Journal of Food Engineering 80 (2) : 408 – 416.
Ogunjimi, L.A.O, N. A. Aviara and O. A. Aregbesola, 2002. Some Engineering Properties of Locust Bean Seed. Journal of Food Engineering 55 (2) : 95 – 99.
Olukunle, O.J. and B.O. Akinali, 2012. Investigating Some Engineering Properties of Coffee Seeds and Beans. Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS) 3(5): 743 – 747.
Omobuwajo, T.O., L. A Sanni and Y. A Balami, 2000. Physical Properties of Sorrel (Hibiscus sabdariffa) Seeds. Journal of Food Engineering 45(1) : 37-41.
Özgüven, F. and K. Vursavu?, 2005. Some Physical, Mechanical and Aero-dynamic properties of Pine (Pinus pinea) Nuts. Journal of Food Engineering 68(2) : 191–196.
Raharjo, P. 2012. Panduan Budidaya dan Pengolahan Kopi Arabika dan Robusta. Penebar Swadaya. Jakarta.
Standar Nasional Indonesia. 2008. SNI-01-2907-2008 tentang Biji Kopi.
Wang, B., D. Li, L.J. Wang, Z.G. Huang, L. Zhang, X.D. Chen & Z.H. Mao. 2007. Effect of Moisture Content on The Physical Properties of Fibered Flaxseed. International Journal of Food Engineering 3 (5) : 1 – 11.
Yalcin, I., C. Özarslan and T. Akba?, 2007. Physical Properties of Pea (Pisum sativum) seed. Journal of Food Engineering 79 (2) : 731 –735.
Yudianto, D. 2013. Profil Tingkat Kematangan Buah Kopi Rakyat dan Identifikasi Sifat Fisik Kopi Beras dan Kopi Bubuk di Desa Sosokan Taba Kabupaten Ke-pahyang. [Skripsi]. Universitas Bengkulu.