Hi Sushil, the major reactive phospholipids are phosphatydyl ethanolamine (PE, amine conjugation) and phosphatydyl serine (PS amine and -COOH conjugation).

If you don't want to do the modification yourself, s good selection of modified lipids can be found at

https://avantilipids.com/products

Mr. Koirala,

Without high level quantum chemical data there is unable to comment nature of chemical bond.

Thank you Steingrimur Stefansson and Ms Ivanova.

I will get back to you as I get more information