Beer contains organic compounds responsible for its organoleptic characteristics. During brewing, inorganic species like Cu can be unintentionally added. Cu plays a role in metabolism but excess is harmful. The WHO set a Cu ingestion limit. Monitoring Cu in beer is important since consumption is high. Sample digestion is usually required before Cu determination due to matrix effects. Considering Cu levels and dilution from digestion, sensitive techniques like atomic absorption spectrometry are needed.
Dispersive liquid-liquid microextraction (DLLME) can extract and preconcentrate analytes for elemental analysis. DLLME is simple, fast, and provides high preconcentration. Combining DLLME with flame atomic absorption spectrometry (FAAS) is an interesting approach since FAAS is inexpensive, simple and fast. Although Cu determination after DLLME has been done in some matrices, beer has not been reported.
This work proposed Cu extraction/preconcentration in beer using DLLME-FAAS. Key DLLME parameters were evaluated. The method was applied to beer samples and compared to microwave digestion with ICP-OES and ICP-MS.
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