Serum micronutrient and micromineral concentrations and ratios in healthy Omani subjects.
OBJECTIVE
This study aimed to establish reference ranges of serum concentrations of copper, zinc, retinol, alpha-tocopherol, copper:caeruloplasmin and copper:zinc ratios in a group of healthy Omani men and women.


METHODS
Assay techniques employed were atomic absorption spectrophotometry (copper and zinc), reverse-phase high-pressure liquid chromatography with isocratic elution (retinol and alpha-tocopherol), immunonephelometry (caeruloplasmin) and spectrophotometry (albumin and cholesterol).


RESULTS
The mean +/- SD (microM) obtained for copper, zinc, retinol, and alpha-tocopherol were 15.9 +/- 3.0, 14.2 +/- 2.0, 1.45 +/- 0.39 and 16.9 +/- 4.4, respectively. The mean +/- SD for copper:zinc and copper:caeruloplasmin ratios were 1.15 +/- 0.30 micromol/mmol and 6.99 +/- 0.84 micromol/g, respectively. Significantly higher (p < 0.0001) copper and caeruloplasmin concentrations, copper:zinc and copper:caeruloplasmin ratios and lower zinc, retinol, alpha-tocopherol, cholesterol concentrations and alpha-tocopherol:cholesterol ratio were present in women compared to men. Age appeared to be associated with copper and retinol concentrations, and copper:caeruloplasmin ratios in women; in men, the association was mostly moderate with caeruloplasmin, alpha-tocopherol, cholesterol concentrations and alpha-tocopherol:cholesterol ratios. Smokers had decreased albumin (p = 0.002), zinc (p = 0.023) concentrations, and copper:caeruloplasmin ratios (p = 0.002), increased alpha-tocopherol concentrations (p = 0.016) and alpha-tocopherol:cholesterol ratios (p = 0.021) compared with non-smokers. Deficiency incidence was < or =5% for all investigated parameters.


CONCLUSIONS
Reference ranges of micronutrient concentrations and micromineral ratios were established for Omani subjects. The mean values of several micronutrients were lower than those reported for other populations and some showed gender effects.
Abiaka
Clifford
C
Department of Biochemistry, College of Medicine and Health Sciences, Sultan Qaboos University, Al-Khoudh, Oman. clifab@hotmail.com
Al-Tobi
Mohammed
M
Joshi
Ravi
R
D000293:Adolescent; D000328:Adult; D000418:Albumins; D002570:Ceruloplasmin; D002784:Cholesterol / Q000097:blood*; D003300:Copper / Q000097:blood*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009850:Oman; D015995:Prevalence; D012016:Reference Values; D012737:Sex Factors; D012907:Smoking; D014801:Vitamin A / Q000097:blood*; D015032:Zinc / Q000097:blood*; D024502:alpha-Tocopherol / Q000097:blood*
D000418:Albumins; D014801:Vitamin A; D003300:Copper; D002784:Cholesterol; D002570:Ceruloplasmin; D024502:alpha-Tocopherol; D015032:Zinc