(Chien
et al., 2011). However, recently melamine was fraudulently added
to protein-containing products (such as dairy products and animal
feeds) to increase the apparent protein measurement (Lin, 2009;
Tittlemier, 2010). The maximum residue level (MRL) for melamine
set by many countries and by WHO are 1 mg kg1 for infant
formula and 2.5 mg kg1 for other milk and milk-based foods or all
other foods (FAO/WHO, 2010). Thus, rapid and sensitive analytical
method to detect melamine in foods is very urgent