Basing on cell wall composition Gram negative bacterial cell wall is highly hydrophobic than Gram positive bacterial cell wall. The lipid content of Gram negative bacterial sell wall is within 19-20% and in case of Gram positive bacteria it is 1-4%.

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http://www.textbookofbacteriology.net/structure_6.html

Dr. Devi Prasad Samantaray hello sir ,, do you have a reference for the above statement it will be really helpful