In-Situ Growth Of Zinc-Aluminum-Layered Double Hydroxide On Nanoporous Anodized Aluminum Bar For Stir-Bar Sorptive Extraction Of Phenolic Acids

Sample preparation containing extraction step is normally required prior to analysis of different analytes by chromatography instruments including high performance liquid chromatography (HPLC), gas chromatography (GC), electrophoresis or mass spectrometry (MS). The sample preparation step usually has different purposes from sample cleaning-up and the target analytes enrichment to making it compatible with the analytical instrumentation. Solid-phase extraction and liquid-liquid extraction are the most routine and classical extraction methods used in laboratories; however, a large number of published papers have focused on the development of microextraction techniques. The mass and volume of the extraction phase are the main differences between the classical extraction and the microextraction techniques. Among different sample preparation procedures, sorptive extraction (SE) techniques have widely been used for the extraction of different organic compounds [1, 2]. The present study is the first report of in-situ preparation and application of Zn-Al layered double hydroxide coated anodized aluminum stir bar for stir bar sorptive extraction approach. The prepared anion exchange sorbent has been explored for the extraction of three acidic organic compounds including p-hydroxybenzoic acid, 3.4-dihydroxybenzoic and gallic acid from grape juice and nonalcoholic beer samples. After SBSE, phenolic acids were quantified through reversed-phase high-performance liquid chromatography-diode array detection. Plackett–Burman design was employed for screening the experimental factors. The effective factors were then optimized using Box Behnken Design (BBD). Under the optimum conditions, the linearity range of the method was between 0.2 and 200 μg L−1. Batch-to-batch reproducibility at 50 μg L−1 concentration level was 4.6-5.1% (n = 3); the limits of detection were between 0.06 and 0.26 μg L−1. Different juices such as grape and beer samples were satisfactorily analyzed in order to investigate the method capability in real sample analysis.

کلیدواژه ها:

Zn-Al layered double hydroxide ، SBSE ، In-situ formation ، phenolic acids ، HPLC-DAD.