NotesVol. 75 droxide (10%) was refluxed for one hour followed by cooling and acidification with dilute hydrochloric acid.Benzoylation.-The benzoyl derivative (Schotten-Baumann method) was crystallized slowly from alcohol, as colorless crystals, m.p. 111°. It is insoluble in aqueous sodium hydroxide solution (10%) (Found: C, 68.3; H, 4.3; N, 3.5. C20H15O5N requires C, 68.8; H, 4.3; N, 4.0.). The benzoyl derivative was refluxed with aqueous sodium hydroxide solution (10%) for one hour, allowed to cool and acidified with dilute hydrochloric acid, the deposit was crystallized from benzene-petroleum-ether mixture and proved to be (Va or Via) (m.p. and mixed m.p.).The syntheses of the other substances mentioned in the theoretical part are listed in the Tables I and II.

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A whole-cell environmental biosensor was fabricated on a diamond electrode. Unicellular microalgae Chlorella vulgaris was entrapped in the bovine serum albumin (BSA) membrane and immobilized directly onto the surface of a diamond electrode for heavy metal detection. We found that the unique surface properties of diamond reduce the electrode fouling problem commonly encountered with metal electrodes. The cell-based diamond biosensor can attain a detection limit of 0.1 ppb for Zn(2+) and Cd(2+), and exhibits higher detection sensitivity and stability compared to platinum electrodes.