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Molecules 2011, 16(9), 7224-7236; doi:10.3390/molecules16097224
Article

Flow Injection Spectrophotometric Determination of N-Acetyl-L-cysteine as a Complex with Palladium(II)

1,* , 2
 and
1
1 Department of Analytical Chemistry, Faculty of Chemistry and Technology, Teslina 10/V, 21000 Split, Croatia 2 Department of Mediterranean Agriculture and Aquaculture, University of Zadar, Mihovila Pavlinovića bb, 23000 Zadar, Croatia
* Author to whom correspondence should be addressed.
Received: 18 July 2011 / Revised: 16 August 2011 / Accepted: 17 August 2011 / Published: 25 August 2011
(This article belongs to the Special Issue Flow Chemistry)
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Abstract

We describe a new method using flow-injection analysis with spectro-photometric detection, suitable for the determination of N-acetyl-L-cysteine (NAC). The proposed method is appropriate for the determination of NAC in reaction with Pd2+ ions in the concentration range from 1.0 × 10−5 mol L−1 to 6.0 × 10−5 mol L−1. The detection limit NAC was 5.84 × 10−6 mol L−1 and the recorded relative standard deviation of the method is in the range from 1.67 to 4.11%. NAC and Pd2+ form complexes of Pd2+:NAC molar ratios of 1:1 and 1:2, depending on the ratio of their analytical concentrations. The cumulative conditional stability constant for the Pd(NAC)22+ complex is β12' = 2.69 × 109 L2 mol2. The proposed method was compared with the classic spectrophotometric determination of NAC, using the same reagent, PdCl2, and had shown certain advantages: a) shorter analysis time; b) the use of smaller volumes of sample and reagents, which make the proposed method cheaper and faster for NAC determination in real samples without sample pretreatment.
Keywords: flow-injection; spectrophotometry; N-Acetyl-L-cysteine; palladium; complexometry flow-injection; spectrophotometry; N-Acetyl-L-cysteine; palladium; complexometry
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Giljanović, J.; Brkljača, M.; Prkić, A. Flow Injection Spectrophotometric Determination of N-Acetyl-L-cysteine as a Complex with Palladium(II). Molecules 2011, 16, 7224-7236.

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