Table 1

Regression analysis results of data for assaying vitamins B1, B6, B2 and C by HPLC, fluorescence and iodometric titration, respectively

Features

Vitamins


B1

B6

B2

C


Range

20-60 μg/mL

30-90 μg/mL

1-5 μg/mL

50-150 mg

Regression equationa

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 (r2)

0.9984 ± 1.45·10-3

0.9989 ± 1.54·10-3

0.9999 ± 0.00

0.9999 ± 5.0·10-5


ay = 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:10.1186/1475-2891-10-47

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