Gold and Silver Nanoparticles in Optical Molecular Absorption Spectroscopy

Apyari, V. V.; Дмитриенко, С. Г.; Gorbunova, M. V.; Furletov, Aleksei A.; Zolotov, Yu. A.

doi:10.1134/s1061934819010052

Cited by 16 publications

(5 citation statements)

References 29 publications

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“…В настоящее время рост исследований в области получения и стабилизации наночастиц серебра связан с возможностью использования их при создании новых перспективных материалов. Они применяются при создания оптических, электронных, сенсорных устройств нового поколения, весьма актуальны для использования в биoаналитической электрохимии, биомедицине [1][2][3][4][5][6]. Кроме того, небольшие добавки наночастиц серебра в различные наноматериалы способны существенно изменять определенные характеристики полученных материалов.…”

Section: Introductionunclassified

Properties of Silver Sols in Organic Solvents

Konovalova,

Ryabkina,

Denisova

et al. 2024

HDSU

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Аннотация. В статье рассматриваются получение стабильных золей серебра в органических растворителях и их устойчивость при действии УФ облучения. В качестве стабилизатора наночастиц серебра использованы поливинилпирролидон для золя в этиловом спирте и цетилтриметиламмоний бромид для золей в хлористом метилене и хлороформе. Коллоидное состояние серебра в золях подтверждено спектрофотометрическим методом. Золи охарактеризованы по дисперсности и распределению частиц по размерам. Путем испарения растворителя получены порошки стабилизированных золей серебра, обозначенные как «сухие» золи. Растворы «сухих» золей серебра в хлористом метилене, хлороформе и этаноле сохраняют коллоидное состояние. Размер частиц преобладающей фракции после растворения в соответствующем растворителе остается неизменным для золей серебра в хлороформе и этаноле, для золя серебра в хлористом метилене размер частиц увеличивается.При УФ облучении полученных золей установлено понижение интенсивности полосы поверхностного плазмонного резонанса, что соответствует уменьшению концентрации наночастиц в растворе и устойчивости золей.

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Section: Introductionunclassified

Properties of Silver Sols in Organic Solvents

Konovalova,

Ryabkina,

Denisova

et al. 2024

HDSU

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“…44 On the other hand, gold nanoparticles (AuNPs) have been widely used in the development of colorimetric sensors for the detection of a variety of analytes, 45 e.g., proteins, 46,47 microorganisms, 48 antibiotics, 49 and heavy metal ions, 50 and 8-oxo-dG 24,25 because the color of AuNPs solution varied significantly with particle distance and was easily visible to the naked eye. 51 The combination of CDs and AuNPs has proven useful in various sensing strategies. For the detection of aflatoxin B1 (AFB1), nitrogen-doped CDs and aptamer-modified AuNPs were fabricated and assembled based on electrostatic interactions.…”

Section: ■ Introductionmentioning

confidence: 99%

“…On the other hand, gold nanoparticles (AuNPs) have been widely used in the development of colorimetric sensors for the detection of a variety of analytes, e.g. , proteins, , microorganisms, antibiotics, and heavy metal ions, and 8-oxo-dG , because the color of AuNPs solution varied significantly with particle distance and was easily visible to the naked eye …”

Section: Introductionmentioning

confidence: 99%

Fluorescent Aptasensor for Determination of 8-Oxo-2′-deoxyguanosine in Urine Using Carbon Dots and Amine-Functionalized Gold Nanoparticles

Ngernpimai

Thonghlueng

Phothikul

et al. 2023

ACS Appl. Nano Mater.

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8-Oxo-7,8-dihydro-2′-deoxyguanosine (8-oxo-dG) is a crucial biomarker of oxidative DNA damage. Herein, a highly sensitive fluorescent aptasensor for detecting 8-oxo-dG in urine was developed based on aptamer-mediated quenching of amino-terminated oligo(ethylene glycol)-capped gold nanoparticles (NH2-TEG-AuNPs) toward green emissive carbon dots (G-CDs). G-CDs were employed as fluorometric reporters. Upon addition of 8-oxo-dG, it formed a complex with an anti-8-oxo-dG aptamer, resulting in the quenching of fluorescence as NH2-TEG-AuNPs absorbed the emission from G-CDs. Initially, NH2-TEG-AuNPs suppressed the fluorescence intensity of G-CDs via the inner-filter effect (IFE). With the addition of the aptamers to a mixture of G-CDs and NH2-TEG-AuNPs, the electrostatic interactions between the aptamer and NH2-TEG-AuNPs resulted in the aggregation of NH2-TEG-AuNPs and the recovery of the fluorescence intensity of the quenched G-CDs. NH2-TEG-AuNPs dispersed due to the high affinity between the aptamer and 8-oxo-dG molecules, and the system demonstrated a fluorescence ″turn-off″ response of G-CDs. Thus, it was possible to determine the 8-oxo-dG concentration. A fluorescence calibration curve was constructed with two linear ranges: 100–2000 and 2000–10,000 nM. The limit of detection (LOD) for 8-oxo-dG was 15.89 nM. This approach was successfully applied to assess 8-oxo-dG in synthetic urine samples with mean recoveries ranging from 99 to 120% and relative standard deviations (RSDs) between 1.1 and 4.1%. The analytical performance was comparable to a commercially available enzyme-linked immunosorbent assay (ELISA) kit. This proposed fluorescent aptasensor for 8-oxo-dG detection in urine exhibited high selectivity and sensitivity over a broad concentration range against the target molecule and has the potential to be developed as a new platform for rapid screening of 8-oxo-dG.

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“…A good opportunity seems to be provided by nanoparticle-based approaches. Noble-metal nanoparticles, including label-free silver triangular nanoparticles (AgTNPs), are proposed for compound quantitation using spectral methods of analysis [ 23 , 24 , 25 , 26 , 27 , 28 ]. The most common principle underlying nanoparticle-based processes is their colloidal aggregation occurring for many types irrespective of their nature [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Fast and Sensitive Determination of Bioflavonoids Using a New Analytical System Based on Label-Free Silver Triangular Nanoplates

Furletov

Apyari

Гаршев

et al. 2022

Sensors

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Optical sensors based on silver triangular nanoplates (AgTNPs) are insufficiently studied as probes for the spectrophotometric determination of biologically active compounds. In the present article, an interaction between label-free AgTNPs and bioflavonoids in the presence of silver(I) ions was assessed to outline the possibilities of AgTNPs as a colorimetric probe for the fast and sensitive determination of bioflavonoids. It is shown that the interaction was accompanied by a bathochromic shift of the local surface plasmon resonance band of nanoparticles and an increase in its intensity. Seven bioflavonoids differing in their structure were tested. The influence of the structure of analytes and the main external factors on the analytical signal is discussed in detail. It was found that the detection limits of bioflavonoids in the selected optimal conditions increased in the series morin < rutin = quercetin < taxifolin and came to 0.9, 1.2, 1.2, and 2.0 μmol·L−1, respectively. Chrysin, naringenin, and naringin were found not to affect the spectral characteristics of AgTNPs. The suggested approach was applied for the spectrophotometric determination of flavonoids in pharmaceuticals and onion peel.

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Gold and Silver Nanoparticles in Optical Molecular Absorption Spectroscopy

Cited by 16 publications

References 29 publications

Properties of Silver Sols in Organic Solvents

Properties of Silver Sols in Organic Solvents

Fluorescent Aptasensor for Determination of 8-Oxo-2′-deoxyguanosine in Urine Using Carbon Dots and Amine-Functionalized Gold Nanoparticles

Fast and Sensitive Determination of Bioflavonoids Using a New Analytical System Based on Label-Free Silver Triangular Nanoplates

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