The supplementation of yam powder products can give the nutritional benefits of the antioxidant mineral (cu, zn, mn, fe and se) intakes.
Yam has been recognized having the beneficial effects for the prevention of various diseases, such as cancer, immunity, infection and obesity etc. There is increasing consideration to supplement the antioxidant nutrients to make up the lack of the antioxidant nutrient intakes. No study has been reported for the analysis of antioxidant mineral contents and comparison to dietary recommended intake for the sense of health promotion. In our study, we analyzed the contents of antioxidant trace elements (Zn, Mn, Fe, Cu and Se) and Cr contents in cultivated Korean yam powders for evaluation of nutrient intake aspects. We collected the commercial yam powders from six different cultivated areas in the South Korea and measured antioxidant minerals (Zn, Mn, Fe, Cu and Se) and Cr contents using trace element-free plasma spectrometer (ICP) or atomic absorption spectrometer (AAS) after dry-ashing and then wet-acid digestion. The accuracy of mineral analysis method was confirmed by the mineral analysis of standard reference material. Each analyzed element contents in yam were compared to dietary reference intakes of Koreans (KDRIs). The average levels of trace elements (Zn, Mn, Fe, Cu, Se and Cr) in yam powders were 18.3, 11.9, 36.0, 3.7, 1.9 and 1.27 μg/g yam powder, respectively. The intakes of Zn, Fe, Cu and Se of which KDRIs is determined, are accounted as being up to 23.8%, 55.6%, 32.5% and 236% recommended intake (RI) of KDRIs, if daily yam supplementation (50 g) of commercial instruction would be considered. The intake of Mn is about 25% adequate intake (AI) of KDRIs with the daily supplementation of yam powder. Most of mineral intakes from daily yam supplementation were with the range of non-detectable to <10% upper limit (UL) level, which is very much safe. The study results show that daily supplementation of Korean yam power is beneficial to provide the supplemental nutrient intake and also is safe, if the suggested dosage would be considered.
Department of Food Science and Nutrition, College of Ecology, Andong National University, Gyeongbuk 760-749, Korea.
Mee-Young
MY
Shin
Department of Food Science and Nutrition, College of Ecology, Andong National University, Gyeongbuk 760-749, Korea.
Young-Eun
YE
Cho
Department of Food Science and Nutrition, College of Ecology, Andong National University, Gyeongbuk 760-749, Korea.
Chana
C
Park
Department of Food Science and Nutrition, College of Ecology, Andong National University, Gyeongbuk 760-749, Korea.
Ho-Yong
HY
Sohn
Department of Biological Science, Andong National University, Gyeongbuk 760-749, Korea.
Jae-Hwan
JH
Lim
Department of Food Science and Nutrition, College of Ecology, Andong National University, Gyeongbuk 760-749, Korea.
In-Sook
IS
Kwun
KDRIs; antioxidant minerals (Cu, Zn, Fe, Mn and Se); nutritional intake; yam