Materials and Reagents
A reference standard of atorvastatin (lot no.
A00138109I; purity, 96.0%), ortho-hydroxy-atorvastatin
(lot no. 1010–085A4; purity, 95.8%), and the internal
standard (IS), [d5]-atorvastatin (lot no. 1031–178A3;
purity, 95.8%) and [d5]-ortho-hydroxy-atorvastatin (lot
no. 1031–167A2; purity, 96.9%), were donated by
Sandoz China, Shanghai Novartis Trading, Ltd. (Shanghai,
People’s Republic of China). Acetonitrile, methanol,
formic acid dimethyl carbinol, methylene chloride, and
tert-butyl-methyl-ether were of HPLC grade and purchased
from Tedia Company Inc. (Fairfield, Ohio). Other
reagents were of analytical grade.
Materials and ReagentsA reference standard of atorvastatin (lot no.A00138109I; purity, 96.0%), ortho-hydroxy-atorvastatin(lot no. 1010–085A4; purity, 95.8%), and the internalstandard (IS), [d5]-atorvastatin (lot no. 1031–178A3;purity, 95.8%) and [d5]-ortho-hydroxy-atorvastatin (lotno. 1031–167A2; purity, 96.9%), were donated by Sandoz China, Shanghai Novartis Trading, Ltd. (Shanghai,People’s Republic of China). Acetonitrile, methanol,formic acid dimethyl carbinol, methylene chloride, andtert-butyl-methyl-ether were of HPLC grade and purchasedfrom Tedia Company Inc. (Fairfield, Ohio). Otherreagents were of analytical grade.
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