Selectivity factor

$$\begin{gathered} S{F}_I=\frac{X_{ \\ 2:I \\ }}{X_{ \\ 1:I|2:I|3:I \\ }}\cdot \frac{\sum X_{ \\ 1:U|2:U|3:U \\ }}{\sum X_{ \\ 2:U \\ }} \end{gathered}$$

Abbreviations

• SF

Description

Selectivity factor (SF) quantifies the relative preference for that specific fatty acid at the sn-2 position compared to other fatty acids that are also preferentially esterified there. A higher SF reveals a greater competitive advantage for a particular fatty acid for that position.

It provides a comparative measure of how strongly a specific fatty acid competes for the sn-2 position relative to other fatty acids that show a preference for it.

Interpretation:

• 0..1 indicates a preference for sn-1 and sn-3 positions;
• 1 indicates no preference for sn positions;
• 1..3 indicates a preference for the sn-2 position.

References

• Верещагин, 1972, стр. 176