PMID- 32797837
OWN - NLM
STAT- MEDLINE
DCOM- 20201001
LR  - 20201001
IS  - 1873-3778 (Electronic)
IS  - 0021-9673 (Linking)
VI  - 1626
DP  - 2020 Aug 30
TI  - Hierarchical zeolitic imidazolate framework-67 derived from in-situ synthesized 
      CO-Al layered double hydroxide embedded within porous-anodized aluminum foil for 
      thin film microextraction of caffeine followed by its high performance liquid 
      chromatography-ultraviolet detection.
PG  - 461358
LID - S0021-9673(20)30635-X [pii]
LID - 10.1016/j.chroma.2020.461358 [doi]
AB  - In this study, the in-situ conversion of the synthesized Co-Al layered double 
      hydroxide (Co-Al LDH) nanosheets to three dimensional hierarchical zeolitic 
      imidazolate framework-67 (3D HZIF-67) was presented as a cost-effective, highly 
      efficient, flexible and robust sorbent to carry out the microextraction process. 
      In the first stage, the anodized aluminum foil was prepared electrochemically. 
      Then, the Co-Al LDH precursor was constructed on the surface of the 
      previously-prepared anodized Al foil applying in-situ formation approach. The 
      procedure is followed by the conversion of the prepared Co-Al LDH film to 3D 
      HZIF-67 film via a facile solvothermal method without adding cobalt salt. The 
      in-situ prepared 3D HZIF-67-anodized Al was used for the thin film 
      microextraction (TFME) of caffeine. The effective factors in TFME procedure were 
      investigated and optimized through applying Central Composite Design (CCD). In 
      the obtained optimal condition, the calibration curves for TFME-HPLC-UV of 
      caffeine were linear in the range of 1-200 microg L(-)(1) with the coefficient of 
      determination (r(2)) higher than 0.9915. The limits of detection were 0.33 and 
      0.38 microg L(-)(1), in water and urine matrices, respectively. Moreover, the 
      enrichment factors (EFs) and absolute recoveries (%AR) were also calculated as 
      173-198 and 57.1%-65.3%, respectively. The inter-day relative standard deviations 
      (RSDs) were evaluated as the method precision for 20 and 200 microg L(-)(1) of spiked 
      sample and were between 4.9-6.1%. The repeatability of the preparation step was 
      investigated as batch-to-batch reproducibility and it was found to be 4.9%; as a 
      result, the reproducibility of the presented film was approved. Finally, the 
      proposed method was utilized to determine caffeine (as the model analyte) from 
      different types of real samples including urine, coffee, beverage (Pepsi) and 
      shampoo. The obtained recoveries (higher than 88%) confirmed the capability of 
      the method for real sample analysis.
CI  - Copyright (c) 2020. Published by Elsevier B.V.
FAU - Alipour, Faezeh
AU  - Alipour F
AD  - Electroanalytical Chemistry Research Laboratory, Department of Analytical 
      Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar, Iran.
FAU - Raoof, Jahan Bakhsh
AU  - Raoof JB
AD  - Electroanalytical Chemistry Research Laboratory, Department of Analytical 
      Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar, Iran. 
      Electronic address: j.raoof@umz.ac.ir.
FAU - Ghani, Milad
AU  - Ghani M
AD  - Department of Analytical Chemistry, Faculty of Chemistry, University of 
      Mazandaran, Babolsar, Iran.
LA  - eng
PT  - Journal Article
DEP - 20200620
PL  - Netherlands
TA  - J Chromatogr A
JT  - Journal of chromatography. A
JID - 9318488
RN  - 0 (Hydroxides)
RN  - 0 (Imidazoles)
RN  - 0 (Solvents)
RN  - 1318-02-1 (Zeolites)
RN  - 3G0H8C9362 (Cobalt)
RN  - 3G6A5W338E (Caffeine)
RN  - CPD4NFA903 (Aluminum)
SB  - IM
MH  - Adsorption
MH  - Aluminum/*chemistry
MH  - Caffeine/*isolation & purification
MH  - Chromatography, High Pressure Liquid/*methods
MH  - Cobalt/*chemistry
MH  - Electrodes
MH  - Hydroxides/*chemistry
MH  - Imidazoles/*chemistry
MH  - Limit of Detection
MH  - Microscopy, Atomic Force
MH  - Porosity
MH  - Reproducibility of Results
MH  - Solvents/chemistry
MH  - Surface Properties
MH  - *Ultraviolet Rays
MH  - Zeolites/*chemistry
OTO - NOTNLM
OT  - 3D HZIF-67/anodized aluminum film
OT  - Caffeine
OT  - Co-Al LDH/anodized aluminum film
OT  - HPLC-UV
OT  - In-situ growth
OT  - Thin film microextraction
COIS- Declaration of Competing Interest The author declare to have no conflict of 
      interests
EDAT- 2020/08/17 06:00
MHDA- 2020/10/02 06:00
CRDT- 2020/08/17 06:00
PHST- 2020/04/18 00:00 [received]
PHST- 2020/06/14 00:00 [revised]
PHST- 2020/06/17 00:00 [accepted]
PHST- 2020/08/17 06:00 [entrez]
PHST- 2020/08/17 06:00 [pubmed]
PHST- 2020/10/02 06:00 [medline]
AID - S0021-9673(20)30635-X [pii]
AID - 10.1016/j.chroma.2020.461358 [doi]
PST - ppublish
SO  - J Chromatogr A. 2020 Aug 30;1626:461358. doi: 10.1016/j.chroma.2020.461358. Epub 
      2020 Jun 20.