\(\text{Energy value of food}\space \text{(kJg)}^{-1}\)= \(\dfrac{\text{a (g)}\times4.2\\ \space \times\space\text{b}}{\text{c (g)} \times 1000}\)
Where:
\(\text{Percentage of vitamin C}\) = \(\dfrac{\text{a}}{\text{b}}\times0.1\%\)
\(\text{Vitamin C concentration} \\ \text{(mg ml)}^{-1}\) = \(\dfrac{\text{a}}{\text{b}}\times1.0\%\)
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