FULL PAPER
Rs = 2(t2–t1)/(w1+w2)
S = 2(μ2–μ1)/(μ1+μ2)
(4)
(5)
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in which t, w and μ are migration times, peak widths at the baseline
and the electrophoretic mobilities, respectively. Resolution values
lower than 1 are reported in Table 6 to permit homogeneous com-
parison with literature data.
Mass Spectrometry: ESI-MS spectra were recorded with a Finnigan
LCQ-Deca ion-trap electrospray mass spectrometer (Bremen, Ger-
many). Solutions of copper complexes were introduced into the ESI
source through a fused silica capillary (100 μm i.d.) from a Hamil-
ton syringe. Solutions of copper complexes were prepared by dis-
solving the cyclodextrin derivative (0.096 mm) in 5 mm
CH3COONH4 (pH 6.8) in the presence of CuSO4, [Cu2+]/CDhm3
1:1.2 for the binary complex, by adding l-Trp (0.080 mm) to the
binary complex to obtain the ternary complex. The experimental
conditions for all the spectra, acquired in positive mode, were op-
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3 μLmin–1, nitrogen sheath gas flow rate 22.0 (arbitrary units), cap-
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40 V.
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expressed as three times standard deviations.
Supporting Information (see footnote on the first page of this arti-
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Acknowledgments
The authors thank the Ministero dell’Università e della Ricerca
(MIUR) (PRIN 2010MZJARJ, FIRB_RINAME_RBA-P114AMK
and FIRB_MERIT_RBN-E08HWLZ) for financial support.
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Received: August 6, 2013
Published Online: November 21, 2013
Eur. J. Inorg. Chem. 2014, 377–383
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