Basic amino acids (BAA) induced 1-(β-carboxyethyl)-3,3-dimethyl-6′-nitrospiro(indoline-2,2′[2H-1]benzopyran) (SP) isomerization to its open form, i.e.merocyanine (MC), and the formation of its complex with BAA in water was reported for the first time, which may provide a potential application for in situ recognition of BAA.
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Liu et al. (2007) studied this question.
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