Table 1 

Regression analysis results of data for assaying vitamins B_{1}, B_{6}, B_{2 }and C by HPLC, fluorescence and iodometric titration, respectively 

Features 
Vitamins 



B_{1} 
B_{6} 
B_{2} 
C 



Range 
2060 μg/mL 
3090 μg/mL 
15 μg/mL 
50150 mg 
Regression equation^{a} 
Y = 214695 x + 3168877 
Y = 191100 x  130681 
Y = 57.9 x + 28.3 
Y = 0.1x + 2.36 
SE of intercept 
2140.2 
694.4 
4.5 
4.05 
SE of slope 
48166.4 
3445.3 
1.9 
0.0 
Correlation coefficient (r^{2}) 
0.9984 ± 1.45·10^{3} 
0.9989 ± 1.54·10^{3} 
0.9999 ± 0.00 
0.9999 ± 5.0·10^{5} 


^{a}y = bx + a, where x is the concentration in μg/mL, except for vitamin C in mg, y is the peak area, for HPLC method, the intensity for fluorescence and volume for titration; a is the intercept and b is the slope. SE= standard error. 

Ribeiro et al. Nutrition Journal 2011 10:47 doi:10.1186/147528911047 