Phytochemical and Nutrient Composition of Rice Husks

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Uzoamaka C. Nnadiukwu
Eugene N. Onyeike
Catherine C. Ikewuchi
Kingsley C. Patrick-Iwuanyanwu


This study deals with the determination of possible phytocompounds, minerals, vitamins and nutritional constituents present in Rice husk (RH). Dried rice husk samples were collected from a local rice mill at Awgu Town in Enugu, South-East Nigeria. The proximate,  phytochemical, vitamin and mineral composition of the ground sample were investigated using standard methods of analysis, while a Gas chromatography-mass spectrometry (GC-MS) device was employed for the characterization of bioactive components of the sample. The proximate analysis revealed the presence of carbohydrate (37.04%), crude protein (1.85%), moisture (7.93%), crude fat (3.76%), fibre (25.74%), and ash content (23.39%). The phytochemical screening high amount of flavonoids, carotenoid, and glycosides in the RH sample. Vitamins such as A, C, D, E, K and B complexes (B1, B2, B3, B5, B6, B7, B9, and B12) as well as minerals (calcium, magnesium, potassium, sodium, zinc, iron, selenium, cobalt, manganese, copper and phosphorus) were also identified in the sample. Meanwhile, the GC-MS analysis of the sample revealed the presence of cynarin, demecolcine, penta-triacontene, hyoscyamine, kheltin, acetyldigoxin, quinoline-3- methyl, coumaric acid, copaene, benzyl benzoate, caryophyllene, danthron, lupenon, beta-amyrin, ephedrine, alpha-ergosterol, galanthamine, kawain, agrimophol, eugenol, anabasine, benzylisoquinoline, carpaine, phytol, phytic acid, myrcene, lobeline, beta-caryophyllene, sparteine, and emetine. This study established that the high nutritional value and bioactive composition of rice husk indicates the rice milling by-product to be a promising food formulate with numerous health benefits.

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How to Cite
Nnadiukwu, U. C., Onyeike, E. N., Ikewuchi, C. C., & Patrick-Iwuanyanwu, K. C. (2023). Phytochemical and Nutrient Composition of Rice Husks: Tropical Journal of Natural Product Research (TJNPR), 7(2), 2457–2463. Retrieved from
Author Biographies

Uzoamaka C. Nnadiukwu, Africa Centre of Excellence in Public Health and Toxicological Research (PUTOR), University of Port Harcourt, PMB, 5323 Port Harcourt, Rivers State, Nigeria.

Department of Biochemistry, Faculty of Science, University of Port Harcourt, Rivers State, Nigeria

Eugene N. Onyeike, Africa Centre of Excellence in Public Health and Toxicological Research (PUTOR), University of Port Harcourt, PMB, 5323 Port Harcourt, Rivers State, Nigeria.

Department of Biochemistry, Faculty of Science, University of Port Harcourt, Rivers State, Nigeria

Catherine C. Ikewuchi, Africa Centre of Excellence in Public Health and Toxicological Research (PUTOR), University of Port Harcourt, PMB, 5323 Port Harcourt, Rivers State, Nigeria.

Department of Biochemistry, Faculty of Science, University of Port Harcourt, Rivers State, Nigeria

Kingsley C. Patrick-Iwuanyanwu, Africa Centre of Excellence in Public Health and Toxicological Research (PUTOR), University of Port Harcourt, PMB, 5323 Port Harcourt, Rivers State, Nigeria.

Department of Biochemistry, Faculty of Science, University of Port Harcourt, Rivers State, Nigeria


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