Browsing by Author "Dr. Mian Hasnain Nawaz,"

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    A Porphyrin based Estimation of Histamine Towards Detection of Meat Spoilage
    (Library Information Services COMSATS University Islamabad Lahore Campus, 2023-02-27) Unzila Saeed; CIIT/FA21-R06-014/LHR; Dr. Mian Hasnain Nawaz,; LHR TP 8446
    A major barrier to clinical diabetes diagnosis, management, and therapy is accurate histamine monitoring in chicken flesh. Due to their exceptional optical, electrical, and detecting qualities, histamine sensors based on fluorescent 2D material nanocomposites have drawn a lot of interest. The zinc oxide nanoparticles (ZnO NPs) developed in the current research display exceptional sensitivity and selectivity with 5,10,15,20-Tetrakis(4-hydroxyphenyl)-21H,23H-porphine (THPP) dye because of their high surface area, increased number of active sites, and improved common optical and electrical features, Using several characterization instruments such as SEM, XRD, FTIR, RAMAN spectroscopy, UV-Vis and Fluorescence Spectrophotometry morphology, and the surface chemistry chemical content, and fluorescence behaviour of the produced samples were justified. In the designed sensor, the fluorescence quenching of the THPP dye with ZnO-NPs when treated with various concentrations of histamine and without histamine, successfully increased the response of the fluorescent dye. The sensor has a linear range of 1.2 mM to 6.7 mM of histamine and a sensitivity of 3.34% mM-1 with the lower limit of detection i.e., 0.089 mM. Through the use of various molar concentrations of histamine and other analytes, the sensor's selectivity and sensitivity have been verified. Accordingly, based on our findings, the suggested sensor has a high level of discernment and responsiveness in its behaviour of fluorescence quenching efficiency towards histamine
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    Synthesis and Characterization of Cerium Oxide Nanorods on Surface of Polydopamine Coated Carbon Cloth for Ethanol Detection
    (Library Information Services COMSATS University Islamabad Lahore Campus, 2021-02-24) Rabia Batool; FA19-R06-030; Dr. Mian Hasnain Nawaz,; LHR TP 7337
    The on-site monitoring of ethanol is critical because of its widespread use in several applications such as pharmaceuticals, brewing, food, and chemical industries. Excess ethanol over the allowed maximum level has life-threatening consequences. Several studies have previously focused on simple, miniaturized, cost-effective, and sustainable methods, which are especially important in resource-limited situations. The current study is aimed at developing a robust electrode sensing interface for meeting application needs, as well as operational stability for quality control applications. The sensor layer (CeO/PDA@CC) is a composite of PDA and Cerium oxide nanostructure. Dopamine was effectively electropolymerized over the surface of carbon cloth, boosting the electron transfer rate compared to bare CC. The modified electrode (PDA@CC) was then deposited with CeO nanostructures by voltammetric technique. The synergistic impact of PDA and CeO nanostructure can develop a reliable ethanol sensor with admirable working stability. The synthesized sensor coating materials are evaluated using XRD, contact angle, SEM, and EDX investigation to evaluate the surface morphology and characterization of materials. EIS and CV were employed to evaluate the electrochemical performance of the developing sensor. At the designed sensor, cyclic voltammetry (CV) is used to measure the ethanol concentration ranging from 1 mM to 30 mM. The modified electrode was employed for real samples to ensure its suitability for practical applications. Ethanol identification and quantification at the milli-molar level are promising for on-the-spot monitoring and other quality control purposes