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¹³C and ¹⁵N—Chemical Shift Anisotropy of Ampicillin and Penicillin-V Studied by 2D-PASS and CP/MAS NMR

Author： Antzutkin O.N. Lee Y.K. Levitt M.H.

Publisher： Academic Press

ISSN： 1090-7807

Source： Journal of Magnetic Resonance, Vol.135, Iss.1, 1998-11, pp. : 144-155

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

The principal values of the chemical shift tensors of all ¹³C and ¹⁵N sites in two antibiotics, ampicillin and penicillin-V, were determined by 2-dimensional phase adjusted spinning sideband (2D-PASS) and conventional CP/MAS experiments. The ¹³C and ¹⁵N chemical shift anisotropies (CSA), and their confidence limits, were evaluated using a Mathematica program. The CSA values suggest a revised assignment of the 2-methyl ¹³C sites in the case of ampicillin. We speculate on a relationship between the chemical shift principal values of many of the ¹³C and ¹⁵N sites and the &bgr;-lactam ring conformation.

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