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Accessible Unlicensed Requires Authentication Published by De Gruyter February 10, 2015

Studies on Grinding and Extraction of Oil from Fenugreek (Trigonella foenum-graecum) Seed

Savitha HG and Manohar B


Fenugreek (Trigonella foenum-graecum) seed known for its many medicinal properties is studied for its grinding characteristics in an impact-type hammer mill. The particle size distribution (PSD) data of powder was found to regress very well with well-known mathematical Rosin–Rammler–Bennet model. Several statistical parameters of the PSD such as mass relative span, size guide number, skewness, uniformity index, uniformity coefficient were also estimated. Weight mean diameter for the entire range of grinding was between 395.8 and 620.8 µm. Specific energy consumption (32.4–115.2 kJ/kg) increased linearly with increase in size reduction ratio (4.53–7.10). Fenugreek powder fraction with less than 200 µm resulted in highest oil yield. Oil yield was found increasing with increase in size reduction ratio.


The authors thank the pilot plant staff of Food Engineering Department, CFTRI, Mysore for their help in data collection.


1. SakhareSD, InamdarAA, PrabhasankarP. Roller milling process for fractionation of fenugreek seeds (Trigonella foenum-graecum) and characterization of milled fractions. J Food Sci Tech2014, Published online 16, Feb 2014.Search in Google Scholar

2. Al-HaboriM, RamanA. Pharmacological properties. In: Petropoulos, GA,editor. Fenugreek, the genus Trigonella. New York: Taylor and Francis, 2002.Search in Google Scholar

3. ToppoFA, AkhandR, PathakAK. Pharmacological actions and potential uses of Trigonella foenum-graecum: a review. Asian J Pharm Clin Res2009;2:2938.Search in Google Scholar

4. YadavR, KaushikR, GuptaD. The health benefits of Trigonella foenum-graecum: a review. Int J Eng Res Appl2011;1:325.Search in Google Scholar

5. MathurV, MathurNK. Fenugreek and other lesser known legume galactomannan-polysaccharides: scope for developments. J Sci Ind Res2005;64:47581.Search in Google Scholar

6. MurthyCT, BhattacharyaS. Cryogenic grinding of black pepper. J Food Eng2008;85:1828.Search in Google Scholar

7. RavindranPN, MadhusoodananKJ. Cardamom: the genus Elettaria. New York: Taylor and Francis, 2002.Search in Google Scholar

8. AltuntaşE, OzgözE, TaşerOF. Some physical properties of fenugreek (Trigonella foenum-graceumL.) seeds. J Food Eng2005;71:13743.Search in Google Scholar

9. ShakuntalaS, NaikJP, JeyaraniT, NaiduMM, SrinivasP. Characterisation of germinated fenugreek (Trigonella foenum-graecum L.) seed fractions. Int J Food Sci Technol2011;46:233743.Search in Google Scholar

10. BarnwalP, SinghKK, SharmaA, ChoudharyAK, ChothaniHR, SaxenaSN. Effect of moisture content, screw and grinder speed on physical and thermal properties of fenugreek powder. Int J Seed Spices2013;3:1321.Search in Google Scholar

11. BarnwalP, SinghKK, MohiteA, SharmaA, SaxenaSN. Influence of cryogenic and ambient grinding on grinding characteristics of fenugreek powder: a comparative study. J Food Proc Preser2014;12342. published online: 5 Sep 2014, doi:10.1111/jfpp.Search in Google Scholar

12. YangR, WangH, JingN, DingC, SuoY, YouJ. Trigonella foenum-graecum L. seed oil obtained by supercritical CO2 extraction. J Am Oil Chem Soc2012;89:226978.Search in Google Scholar

13. RaoGB, PonrajAM, RajendranTK, 2001. Process for obtaining useful materials from fenugreek seeds. US patent 2001/0024665 A1.Search in Google Scholar

14. ChangP. 1999. Method of extraction of commercially valuable fractions of fenugreek. US 5997877A.Search in Google Scholar

15. NakanoY, HoshinoS, ShonoJ, TsugeN. Processed product of fenugreek seeds and method for producing the same. US patent2012 8287927 B2.Search in Google Scholar

16. RosenthalA, PyleDL, NiranjanK, GilmourS, TrincaL. Combined effect of operational variables and enzyme activity on aqueous enzymatic extraction of oil and protein from soybean. Enzyme Microb Technol2001;28:499509.Search in Google Scholar

17. SulaimanS, Abdul AzizAR, ArouaMK. Optimization and modeling of extraction of solid coconut waste oil. J Food Eng2013;114:22834.Search in Google Scholar

18. SirisompongW, JirapakkulW, KlinkesornU. Response surface optimization and characteristics of rambutan (Nephelium lappaceumL.) kernel fat by hexane extraction. LWT – Food Sci Technol2011;44:194651.Search in Google Scholar

19. MeghwalM, GoswamiTK. Effect of grinding methods and packaging materials on fenugreek and black pepper powder quality and quantity under normal storage conditions. Int J Agric Biol Eng2014;7:10613.Search in Google Scholar

20. ShashidharMG, KrishnamurthyTP, GirishKG, ManoharB. Grinding of coriander seeds: modeling of particle size distribution and energy studies. Part Sci Technol2013;31:44957.Search in Google Scholar

21. PrasherCL. Crushing and grinding process handbook. New York: Wiley, 1987.Search in Google Scholar

22. HoldichRG. Fundamentals of particle technology. Nottingham, UK: Midland Information Technology and Publishing, 2002.Search in Google Scholar

23. McCabeW, SmithJ, UnitHP. Operations of chemical engineering. 7th ed. New York: McGraw Hill Publications, 2004.Search in Google Scholar

24. McKettaJJ. Unit operations handbook. Vol. 2, New York: CRC Press, 1992:32.Search in Google Scholar

25. ManoharB, SridharBS. Size and shape characterization of conventionally and cryogenically ground turmeric (curcuma domestica) particles. Powder Technol2001;120:2927.Search in Google Scholar

26. Krishna MurthyTP, GrindingMB. Studies of mango ginger: mathematical modelling of particle size distribution and energy consumption. Am J Food Sci Technol2013;1:706.Search in Google Scholar

27. RosinP, RammlerE. The laws governing the fineness of powdered coal. J Inst Fuel1933;7:2936.Search in Google Scholar

28. HarrisCC. The application of size distribution equation to multi-event communition processes. Trans SME/AIME1968;241:34358.Search in Google Scholar

29. BitraVSP, WomacAR, YangYT, IgathinathaneC, MiuPI, ChevananN, et al.. Knife mill operating factors effect on switchgrass particle size distributions. Bioresour Technol2009;100:517688.Search in Google Scholar

30. OkeyodeIC, JibiriNN. Grain size analysis of the sediments from Ogun River, south western Nigeria. Earth Sci Res2013;2:4351.Search in Google Scholar

31. CFI, 1982. The CFI guide of material selection for the production of quality blends. Canadian Fertilizer Institute, Ottawa, Ontario, Canada.Search in Google Scholar

32. Mohd RozalliNH, ChinNL, YusofYA. Grinding characteristics of Asian originated peanuts (Arachishypogaea L.) and specific energy consumption during ultra-high speed grinding for natural peanut butter production. J Food Eng2015;152:17.Search in Google Scholar

Published Online: 2015-2-10
Published in Print: 2015-4-1

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