Determination of antioxidant activities in fruit juices based on rapid colorimetric measurement and characterisation of gold nanoparticles

Chou, Jason; Li, Xiaofu; Yin, Yifan; Indrisek, Nicole

doi:10.1080/03067319.2015.1036862

Cited by 15 publications

(14 citation statements)

References 37 publications

(50 reference statements)

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“…An example of the UV–visible spectra of AuNPs in the A. deliciosa juice is shown in Figure a (control). It is well-known that colloidal AuNPs have surface plasmon absorption in the range of 520–550 nm depending on their particle sizes. ,, Thus, the absorption peak observed in the four fruit juices/extract indicates the formation of AuNPs with different particle sizes. Among the four fruit juices/extracts tested in this study, AuNPs formed from M. acuminate extract show the lowest λ max at 535 nm, while the AuNPs from the M. domestica juice have the highest λ max at 549 nm.…”

Section: Results and Discussionmentioning

confidence: 97%

Size-Controlled Green Synthesis of Highly Stable and Uniform Small to Ultrasmall Gold Nanoparticles by Controlling Reaction Steps and pH

et al. 2017

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Synthesis of gold nanoparticles (AuNPs) with controllable particle size and stable dispersion through green chemistry without using toxic regents is crucial for biomedical applications. In this study, spherical AuNPs with controllable particle size in the range of 8 to 18 nm were synthesized by the reduction of HAuCl4 using only fruit juices/extract without adding any other chemicals. By controlling the chemical reaction steps and adjusting the pH of the solution at a later stage of the reaction, the sizes of the spherical AuNPs were fine tuned to 4.5 ± 2.0 nm, 5.9 ± 2.5 nm, and 6.0 ± 1.5 nm with fruit juices/extract of A. deliciosa, P. persica, and M. domestica, respectively. For the first time, spherical ultrasmall AuNPs of 2.6 ± 1.1 nm with uniform distribution were successfully achieved using M. Acuminate extract at pH 10 and 11. The ultrasmall and small AuNPs were imaged again by transmission electron microscopy (TEM) after 4 months stored at the room temperature and 72 h incubation in 1 mM NaCl, which is typically found in biological media. No aggregation was observed in the above AuNP solutions after four months and incubation for 72 h in NaCl. These results indicate that highly stable AuNPs synthesized through green chemistry can be used in cells or embryos and hold great promise in biological applications.

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Section: Results and Discussionmentioning

confidence: 97%

Size-Controlled Green Synthesis of Highly Stable and Uniform Small to Ultrasmall Gold Nanoparticles by Controlling Reaction Steps and pH

et al. 2017

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“…As a rule, to determine the integral AOA/concentration of the object under study, the indicator electrodes are manufactured by screen printing using carbon or Pt pastes [6,34,[36][37][38][39] or new materials, for example, carbon veil [40]. In a number of works, to improve the quality of the electrode, nanomaterials are deposited on its surface [41][42][43][44][45][46][47][48][49][50].…”

Section: Sensorsmentioning

confidence: 99%

Electrochemical Hybrid Methods and Sensors for Antioxidant/Oxidant Activity Monitoring and Their Use as a Diagnostic Tool of Oxidative Stress: Future Perspectives and Challenges

Брайнина

Kazakov

2020

Chemosensors

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The terminology used in electrochemical methods which are used to generate the measured signal in antioxidant/oxidant activity (AOA/OA) sensors is briefly considered. The review presents a hybrid version of electrochemical methods for the determination of AOA/OA. Invasive electrochemical methods/sensors for AOA/OA of blood/serum/plasma, and non-invasive ones for semen, sweat, saliva and skin determination are described. AOA/OA sensors application in health estimation, cosmetology, food and nutrients is presented. Attention is paid to widely described approaches and technologies used in chemical/biochemical sensors. It will be considered as base/prototypes for developing sensors of the kind for AOA/OA determination. Prospects for the development of wearable, written sensors and biosensors are considered. Miniature and wireless sensors will allow for the monitoring of the patient’s state, both at the bedside and far beyond the hospital. The development of wearable self-powered written and printed sensors is an important step towards personalized medicine.

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“…Based on TEM images, the average nanoparticles size and their size distribution were analyzed by ImageJ1.50i [24]. Ten TEM images, containing at least 100 particles in each of the images, were applied to calculate the sizes of AuNPs, including their statistically significant mean and standard deviation values.…”

Section: Image Processingmentioning

confidence: 99%

Study of Green Synthesis of Ultrasmall Gold Nanoparticles Using Citrus Sinensis Peel

Yang

Tan

et al. 2019

Applied Sciences

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Sweet orange (Citrus sinensis) peel, one of the most underutilized biowaste, was in this study employed for the green synthesis of gold nanoparticles (AuNPs) as an alternative source of reductant and stabilizer. Spherical AuNPs with narrow size distribution (1.75 ± 0.86 nm) were obtained by controlling pH and adjusting sequence for the first time. ultraviolet-visible (UV-vis) spectrophotometer, transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDS), dynamic light scattering (DLS) were applied to detect the characteristic surface plasmon resonance peak, morphological and aggregate characteristic, elementary composition and hydrodynamic diameter, respectively. The major functional groups in extract were tested by Fourier transform infrared(FT-IR) spectrophotometer to characterize the components which are responsible for the reduction and stabilization of AuNPs. The possible role of the components during the process of AuNPs synthesis is also discussed. The result of this study enriched the green source for ultra-small AuNPs synthesis, and will help to understand the mechanism of synthesis and stability of ultra-small AuNPs by fruit peels extract.

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Determination of antioxidant activities in fruit juices based on rapid colorimetric measurement and characterisation of gold nanoparticles

Cited by 15 publications

References 37 publications

Size-Controlled Green Synthesis of Highly Stable and Uniform Small to Ultrasmall Gold Nanoparticles by Controlling Reaction Steps and pH

Size-Controlled Green Synthesis of Highly Stable and Uniform Small to Ultrasmall Gold Nanoparticles by Controlling Reaction Steps and pH

Electrochemical Hybrid Methods and Sensors for Antioxidant/Oxidant Activity Monitoring and Their Use as a Diagnostic Tool of Oxidative Stress: Future Perspectives and Challenges

Study of Green Synthesis of Ultrasmall Gold Nanoparticles Using Citrus Sinensis Peel

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