Electrochemically Synthesized Biogenic Silver Nanoparticles Using Green Tea Extract as a Promising Antioxidant

Hermanto, Dhony; Ismillayli, Nurul; Irmawanti, Irmawanti; Fathulloh, Ilfa; Nila, Diska; Zuryati, Ulul Khairi; Muliasari, Handa; Wirawan, Rahadi

doi:10.33640/2405-609x.3276

Cited by 6 publications

(7 citation statements)

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“…The colorimetric probe has a slope of 11.951 a.u L/mg, a greater value than previous studies of 0.0331 and 0.0085 a.u L/mg, which used bromothymol blue and poly(sulfobetaine methacrylate) as indicators [12,25]. Moreover, AgNP offers good accuracy and long-term stability [17].…”

Section: Probe Linear Range (Mg/l) Lod Mg/l Refmentioning

confidence: 91%

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Inhibitive determination of organophosphate pesticides using acetylcholinesterase and silver nanoparticle as colorimetric probe

Hermanto,

Ismillayli,

Hamdiani

et al. 2023

Environmental Engineering Research

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Accurate and real-time detection of pesticides is needed to ensure food safety and ecosystem protection. A biosensor was developed to determine organophosphate pesticides using acetylcholinesterase (AChE) and silver nanoparticle (AgNP) immobilized on the alginate-chitosan film matrix. The sensing principle is based on organophosphate pesticides (OP) inhibiting AChE activity. AChE hydrolyzes acetylthiocoline (ATCh) to thiocholine (TCh) and acetic acid (AA). The -SH group on TCh induces AgNP aggregation, resulting in fading of the film's brownish-yellow color. The presence of OP in the sample inhibited AChE activity, leading to a decrease in TCh and color fading. The biosensor response is determined by measuring the Red Green Blue (RGB) value of the film. The biosensor offers rapid detection directly in-situ and real time without the use of sophisticated instruments, with optimal measurement conditions of pH 7, incubation time of 1 minute, and concentrations of AgNP, ATCh, and tris-HCl buffer of 10 μg/mL, 50, and 7 mM, respectively. Biosensors have excellent sensitivity, reproducibility, and selectivity. Measurement of OP levels in nine vegetable samples revealed that the proposed colorimetric probe's results agreed well with the GC result as the reference method. Therefore, this method can be applied in monitoring food and environment OP levels.

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Section: Probe Linear Range (Mg/l) Lod Mg/l Refmentioning

confidence: 91%

“…The biogenic AgNP was synthesized using electrolysis of green tea extract solution, as described by Hermanto et al [17,18]. The anode and cathode are made of silver metal rods, and their polarity is switched every 1 minute by a controller.…”

Section: Preparation Of Biogenic Agnpmentioning

confidence: 99%

Inhibitive determination of organophosphate pesticides using acetylcholinesterase and silver nanoparticle as colorimetric probe

Hermanto,

Ismillayli,

Hamdiani

et al. 2023

Environmental Engineering Research

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“…This step was essential for isolating the Pb-NPs and resulted in the formation of visible precipitates in the solution. These precipitates were meticulously collected, and 700C drying was then performed (11), Figure 1 provides an illustration of this process. Using a ceramic mortar, the material was homogenized until it created a very fine powder.…”

Section: Methodsmentioning

confidence: 99%

Determination, Manufacturing and application of a nanoparticle lead ion-selective electrode as a sensor in flow injection systems

Al-Samarrai

2024

Sensors and Machine Learning Applications

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This study involves the construction of ion-selective electrodes for the determination of lead (II) ions and their utilization as sensors in a flow-injection analysis (FIA) system. The electrode was constructed using a simple environmentally friendly method from a green tea extract, and a Lead acetate solution of the cited ions as a cylindrical disc. A vertical, side-to-side cylinder, the whole is created in its centre and another lateral hole is created for the electrical attachment of the electrode, so the prepared electrode is suitable for use with the FIA system. The electrode was studied surface properties and characteristics of this electrode were analysed using X-ray diffraction and Fourier-transform infrared spectroscopy (FTR). via selection of the optimum conditions (i.e. linear calibration range, lowest Nernstian response, lowest detection limit, degree of dilution, and precision and accuracy of their analytical uses). Electrode which gave the best Nernstian response1.00×10-1 to 1.00×10-10 M, a correlation coefficient of 0.9980, with lower Nernstian response of 1×10-10 M and detection limit of 1×10-11 M. The sampling rate was 120 samples per hour the calculated time of the contact of the sample with the electrode surface is 6 seconds and the degree of dilution is 2.37625.

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“…43 AgNPs released electrons to form Ag + ions, which occurred either on the surface of nanoparticles or via the release from nanoparticles. 44,45 The effective PVP capping action on AgNP 4 formed well-dispersed small nanoparticles that could effectively transfer electrons to DPPH. This also aligned with the negative surface charge of AgNP 4 , as shown in Table 1.…”

Section: Antioxidant Activity Of the Agnpsmentioning

confidence: 99%

The role of pH-induced tautomerism of polyvinylpyrrolidone on the size, stability, and antioxidant and antibacterial activities of silver nanoparticles synthesized using microwave radiation

Ismillayli,

Suprapto,

Santoso

et al. 2024

RSC Adv.

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Electrochemically Synthesized Biogenic Silver Nanoparticles Using Green Tea Extract as a Promising Antioxidant

Cited by 6 publications

References 0 publications

Inhibitive determination of organophosphate pesticides using acetylcholinesterase and silver nanoparticle as colorimetric probe

Inhibitive determination of organophosphate pesticides using acetylcholinesterase and silver nanoparticle as colorimetric probe

Determination, Manufacturing and application of a nanoparticle lead ion-selective electrode as a sensor in flow injection systems

The role of pH-induced tautomerism of polyvinylpyrrolidone on the size, stability, and antioxidant and antibacterial activities of silver nanoparticles synthesized using microwave radiation

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