refrence

http://www.chemistry.ccsu.edu/

http://www.elmhurst.edu/

http://www.chemguide.co.uk/

http://www.redwop.com/download/ninhydrn.pdf

http://en.wikipedia.org/wiki/Ninhydrin

http://antoine.frostburg.edu/chem/senese/101/organic/faq/amino-acid-test.shtml

http://www.woelen.nl/chem

http://www.chemistry.ccsu.edu/glagovich/teaching/316/qualanal/tests/nitrousacid.html

http://www.chemguide.co.uk/organicprops/amines/nitrousacid.html#top

http://www.chemistry.ccsu.edu/glagovich/teaching/316/qualanal/tests/nitrousacid.html

http://www.chemguide.co.uk/organicprops/amines/nitrousacid.html#top

http://msds.chem.ox.ac.uk/BE/benzenesulfonyl_chloride.html

http://en.wikipedia.org/wiki/Ninhydrin

http://www.chemistry.ccsu.edu/glagovich/teaching/316/qualanal/tests/schotten.html

http://www.sciencelab.com/