Prabakaran A/L Poopalan
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Prabakaran A/L Poopalan
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Prabakaran, A/L Poopalan
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Poopalan, P.
Poopalan, Prabakaran A.L.
Poopalan, Prabakaran
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Scopus Author ID
7003686974

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Surface charge transduction enhancement on nano-silica and - Alumina integrated planar electrode for hybrid DNA determination

2021-06-01 , Ramanathan S. , Prabakaran A/L Poopalan , Subash Chandra Bose Gopinath , Mohd Khairuddin Md Arshad , Anbu P. , Lakshmipriya T. , Salimi M.N. , Pandian K.

This study represents the surface charge transduction, an efficient and inexpensive biosensor with modifications by silica-alumina entities and determination of gene sequence hybridization. The sensing surface was made by the planar aluminium interdigitated electrode on silicon substrate. Silica and alumina nanoparticles were engineered on the planar transducer surface and the device sensitivity was investigated. The morphology of silica and alumina particles was characterized through the high-resolution election microscopic analyses and revealed the spherical shaped nanoscale sizes at the range of 45–100 nm. The elemental compositions of silica and alumina nanomaterial were affirmed through energy disperse spectroscopy as prominent peaks of Si, Al and O were observed. Selected area electron diffraction analysis of silica and alumina justified their crystalline and amorphous nature, respectively. XRD analysis revealed the expending cristobalite state of silica crystal and γ-alumina for planar electrode surface enhancement. Fourier transform infrared spectroscopy peak observed at 1094 cm−1 revealed the asymmetric stretching of silica nanoparticles whereas the projecting peak observed at 806 cm−1. Additionally, Al–O stretch and Al–O–Al bending modes were justified with the peaks at 585 and 825 cm−1, respectively. Band gap values of silica and alumina computed were 6.75 eV and 3.20 eV, respectively. The results of DNA probe immobilization and complementation have affirmed that silica modified transducer shows the lowest detection at 10 aM whereas alumina modified transducer displayed insignificant current signal and failed to detect DNA hybridization. To investigate the effect of silica entity and its nanocomposite in detecting DNA hybridization, aluminosilicate nanocomposite was deposited on transducer and attained highly sensitive gene detection. Based on the coefficient regression value, aluminosilicate nanocomposite modified planar transducer has shown good device sensitivity (R2 = 0.96) in contrast to silica and alumina entities.

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Alkalinized extraction of silica-aluminium nanocomposite from traditional Chinese joss paper: Optical characterizations

2020-03-01 , Ramanathan S. , Subash Chandra Bose Gopinath , Mohd Khairuddin Md Arshad , Prabakaran A/L Poopalan , Anbu P. , Lakshmipriya T. , Lee C.G.

The Chinese traditional joss paper has been recycled and silica and aluminium nanocomposite production is reported in the current research, using an alkalinization procedure. Characterization of silica and aluminium nanocomposite extracted was performed using field-emission transmission electron microscope (FETEM), field-emission scanning electron microscope (FESEM), UV–visible spectroscopy, high-power optical microscopy (HPM) and 3D nano profiler, indicates the size, shape and particle distribution, eventually reveals the purity of silica and aluminium nanocomposite synthesized. The silica-aluminium nanocrystal synthesized from joss paper waste was found to be ~15 nm size range under FETEM analysis and FESEM analysis revealed the uniform spherical shape. The energy disperse spectroscopy (EDX) data attained from FESEM analysis affirmed the synthesis of silica-aluminium nanocomposite with greater purity since the ratio of silicon to aluminium observed in EDX spectra was 13.24 to 7.96. HPM indicated the size of agglomerated aluminosilicate is 36.74 μm whereas 3D nano profiler has proven that the height of nanocrystal synthesized from joss paper waste is 234.37 μm. Band gap value of 3.84 eV, calculated using UV–vis absorbance readings further affirmed the size of nanocomposite which is in good agreement with presented results.

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Aluminosilicate Nanocomposites from Incinerated Chinese Holy Joss Fly Ash: A Potential Nanocarrier for Drug Cargos

2020-02-25 , Ramanathan S. , Subash Chandra Bose Gopinath , Mohd Khairuddin Md Arshad , Prabakaran A/L Poopalan , Anbu P. , Lakshmipriya T.

An incredible amount of joss fly ash is produced from the burning of Chinese holy joss paper; thus, an excellent method of recycling joss fly ash waste to extract aluminosilicate nanocomposites is explored. The present research aims to introduce a novel method to recycle joss fly ash through a simple and straightforward experimental procedure involving acidic and alkaline treatments. The synthesized aluminosilicate nanocomposite was characterized to justify its structural and physiochemical characteristics. A morphological analysis was performed with field-emission transmission electron microscopy, and scanning electron microscopy revealed the size of the aluminosilicate nanocomposite to be ~25 nm, while also confirming a uniformly spherical-shaped nanostructure. The elemental composition was measured by energy dispersive spectroscopy and revealed the Si to Al ratio to be 13.24 to 7.96, showing the high purity of the extracted nanocomposite. The roughness and particle distribution were analyzed using atomic force microscopy and a zeta analysis. X-ray diffraction patterns showed a synthesis of faceted and cubic aluminosilicate crystals in the nanocomposites. The presence of silica and aluminum was further proven by X-ray photoelectron spectroscopy, and the functional groups were recognized through Fourier transform infrared spectroscopy. The thermal capacity of the nanocomposite was examined by a thermogravimetric analysis. In addition, the research suggested the promising application of aluminosilicate nanocomposites as drug carriers. The above was justified by an enzyme-linked apta-sorbent assay, which claimed that the limit of the aptasensing aluminosilicate-conjugated ampicillin was two-fold higher than that in the absence of the nanocomposite. The drug delivery property was further justified through an antibacterial analysis against Escherichia coli (gram-negative) and Bacillus subtilis (gram-positive).

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Aluminosilicate Nanocomposite on Genosensor: A Prospective Voltammetry Platform for Epidermal Growth Factor Receptor Mutant Analysis in Non-small Cell Lung Cancer

2019-12-01 , Ramanathan S. , Subash Chandra Bose Gopinath , Mohd Khairuddin Md Arshad , Prabakaran A/L Poopalan , Anbu P. , Lakshmipriya T. , Kasim F.H.

Lung cancer is one of the most serious threats to human where 85% of lethal death caused by non-small cell lung cancer (NSCLC) induced by epidermal growth factor receptor (EGFR) mutation. The present research focuses in the development of efficient and effortless EGFR mutant detection strategy through high-performance and sensitive genosensor. The current amplified through 250 µm sized fingers between 100 µm aluminium electrodes indicates the voltammetry signal generated by means of the mutant DNA sequence hybridization. To enhance the DNA immobilization and hybridization, ∼25 nm sized aluminosilicate nanocomposite synthesized from the disposed joss fly ash was deposited on the gaps between aluminium electrodes. The probe, mutant (complementary), and wild (single-base pair mismatch) targets were designed precisely from the genomic sequences denote the detection of EGFR mutation. Fourier-transform Infrared Spectroscopy analysis was performed at every step of surface functionalization evidences the relevant chemical bonding of biomolecules on the genosensor as duplex DNA with peak response at 1150 cm−1 to 1650 cm−1. Genosensor depicts a sensitive EGFR mutation as it is able to detect apparently at 100 aM mutant against 1 µM DNA probe. The insignificant voltammetry signal generated with wild type strand emphasizes the specificity of genosensor in the detection of single base pair mismatch. The inefficiency of genosensor in detecting EGFR mutation in the absence of aluminosilicate nanocomposite implies the insensitivity of genosensing DNA hybridization and accentuates the significance of aluminosilicate. Based on the slope of the calibration curve, the attained sensitivity of aluminosilicate modified genosensor was 3.02E-4 A M−1. The detection limit of genosensor computed based on 3σ calculation, relative to the change of current proportional to the logarithm of mutant concentration is at 100 aM.

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