Antibodies can actually be developed, either naturally or biochemically, to bind to just about anything. The hydrophobicity of a particular molecule is of no importance. Immunologically, a hydrophobic antigen may not produce as strong of a response, but I honestly have no idea about specific antigenic capacities. What you should know about antibodies is that their antigen binding sites can be structured to be specific, or at least have some sort of affinity, to any sort of structure (even specific polynucleotides or plastic polymers!).