Selective determination of catechin among phenolic antioxidants with the use of a novel optical fiber reflectance sensor based on indophenol dye formation on nano-sized TiO₂

Journal of Agricultural and Food Chemistry
Reşat ApakEmine Kılıç

Abstract

The optical sensor for "tea catechins" was built by immobilizing 2,2'-(1,4-phenylenedivinylene)bis-8-hydroxyquinoline (PBHQ) on TiO₂ nanoparticles (NPs). The sensor worked by "indophenol blue" dye formation on PBHQ-immobilized TiO₂ NPs as a result of p-aminophenol (PAP) autoxidation with dissolved O₂ at pH 10. Among quercetin, rutin, naringenin, naringin, gallic acid, caffeic acid, ferulic acid, p-coumaric acid, catechin, epicatechin, epicatechin gallate, epigallocatechin, epigallocatechin gallate, and trolox, only catechin group antioxidants delayed the color formation on NPs, as measured by the reflectance signal at 710 nm. For quantitative analysis, reflectance signal versus time was recorded, and the difference between the areas under curve (ΔAUC) in the presence and absence of catechin was correlated (r = 0.98) to catechin concentration. The selectivity of the sensor for catechins was shown in tea infusions compared to other plant extracts and was ascribed to the nonplanar structure of catechin interfering with the formation of perfectly conjugated indophenol blue on TiO₂ surface.

References

Mar 1, 1993·Free Radical Biology & Medicine·G CaoR G Cutler
Jan 1, 1996·Free Radical Biology & Medicine·S A van AckerA Bast
Dec 1, 1996·Chemical Research in Toxicology·S A van AckerA Bast
Feb 3, 1998·Critical Reviews in Food Science and Nutrition·D A BalentineL C Bouwens
Feb 3, 1998·Critical Reviews in Food Science and Nutrition·S A WisemanB Frei
Jul 25, 2000·Journal of Chromatography. a·J J Dalluge, B C Nelson
May 23, 2002·Journal of the American Chemical Society·Kiyoshi FukuharaNaoki Miyata
Nov 24, 2004·Biosensors & Bioelectronics·S A S S GomesM J F Rebelo
May 12, 2005·Journal of Agricultural and Food Chemistry·Ronald L PriorKaren Schaich
Apr 4, 2006·Journal of the American College of Nutrition·Carmen CabreraRafael Giménez
Dec 1, 2006·International Journal of Food Sciences and Nutrition·Reşat ApakErol Erçağ
Jul 4, 2009·Journal of Agricultural and Food Chemistry·Timothy W SirkAmadeu K Sum
Aug 3, 2011·The Journal of Physical Chemistry. a·L Lerner

❮ Previous
Next ❯

Citations

Dec 13, 2016·Current Opinion in Biotechnology·Yun Wang, Timothy V Duncan
Dec 13, 2012·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Marion MartignacFlorence Benoit-Marquié
Nov 11, 2020·Analytical Methods : Advancing Methods and Applications·Reşat ApakSelen Durmazel
Feb 1, 2014·Journal of Agricultural and Food Chemistry·Hongda ChenMatt Hotze

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.