title: Copper content of staple seeds and grains grown in Kanam local government area, Nigeria.
abstract: Copper is a trace mineral that plays an important role in human metabolism, largely because it allows many critical enzymes to function properly. Little is known of copper content of Nigerian foods. In this paper, copper contents of several typical Nigerian foods were determined. The samples were collected from Kanam of Plateau State in central region of Nigeria. The samples were wet-ashed according to the protocol of Hill et al. (Anal Chem 55:2340-2342, 1986).Concentrations of copper in the samples was determined using inductively coupled-mass spectrophotometry. There is, for each crop, a wide variation in copper content. The highest copper content was found in cowpea, Vigna unguiculata (16.95 μg/g of dry weight). Lowest copper content was found in white maize and in yellow maize (Zea mays), with values 1.23 μg/g and 1.38 μg/g of dry weights, respectively. Other foods, such as white sorghum, red sorghum (Sorghum bicolor), millet (Pennisetum glaucum), and groundnuts (Arachis hypogea) had copper contents varying from 2.22 to 11.81 μg/g. These values are well below the supplemental values of 50 mg/day that could interfere with zinc absorption. Thus, among the staple foodstuffs of the areas sampled, cowpea appears to be the richest source of dietary copper followed by groundnut while the two maize varieties are the poorest.
authors: Department of Nutritional Sciences, College of Human Science, Oklahoma State University, Stillwater, OK 74078 USA ; Department of Biochemistry, Faculty of Medical Sciences, University of Jos, PMB, 2084 Jos, Nigeria.
authors: Kiri Hashimu
authors: KH
authors: Jaryum
authors: Zebulon Sunday Chibundo
authors: ZS
authors: Okoye
authors: Barbara
authors: B
authors: Stoecker
keywords: Contents; Copper; Functions; Grains; Kanam
references: Crit Rev Food Sci Nutr. 1992;32(1):1-31
references: 1290583
references: J Biol Chem. 2002 Aug 23;277(34):e22
references: 12243126
references: Am J Clin Nutr. 1983 Jun;37(6):898-903
references: 6405607
references: Biol Trace Elem Res. 2009 May;128(2):104-17
references: 18974939
references: Am J Clin Nutr. 1998 May;67(5 Suppl):952S-959S
references: 9587135
references: Am J Clin Nutr. 1996 May;63(5):797S-811S
references: 8615367
references: Br J Nutr. 2002 May;87(5):393-403
references: 12010579