Volume-13 ~ Issue-7 ~ July 2020

Abstract: We report a simple, easy and sensitive method for detection of melamine in a rather complex pet food sample using gold nanoparticles (AuNPs). The sample preparation was relatively short and effective in removing interference species from the sample. The aggregation of gold nanoparticles in the presence of melamine caused a color change from red to purple and a shift of the absorption band to longer wavelengths. The observable color change and the shift in wavelength was used for melamine detection in solid pet food sample. The limit of detection (LOD) based on visual color change and UV-Vis spectroscopy was found to be 0.25 ppm and 0. 14 ppm, respectively. This LOD is well below the threshold limit set by FDA of USA. The method was highly selective to melamine against other substances present in pet food. HPLC using resorcinol as internal standard was used to validate the performance of the developed method and the percent recovery of melamine ranges from 95.6% to 101.5% with CV less than 5%.

Keywords: Gold nanoparticles (AuNPs), pet food, melamine, HPLC, method validation, TEM, UV-Vis

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Abstract:Background: Electron transfer (redox) reactions play very important roles in many biological processes including collagen synthesis, steroid metabolism, the immune response, drug activation, neurotransmitter metabolism, nitrogen fixation, respiration and photosynthesis. Ruthenium complexes with polypyridyl ligands have received much attention owing to their interesting spectroscopic, photophysical, photochemical and electrochemical properties, which are responsible for their potential uses in diverse areas such as photosensitizers for photochemical conversion of solar energy. Thiourea and its derivatives, of which DMTU is one, can be oxidised by a wide variety.......

Keywords: Kinetics; oxidation; anion catalysis; salt effect.

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Abstract: In this work, we used merchant phosphate from Tahoua. It is a powder obtained by grinding and physical treatment of rock phosphate nodules and is used as a crop fertilizer. However, it has a low reactivity. This does not favour its direct application to the soil to correct soil phosphorus deficiency in order to increase agricultural productivity. The present work aims to improve the solubility of this product by heat treatment to increase its agronomic efficiency. Tahoua merchant phosphate was calcined at 850°C in an adjustable kiln for two hours. The chemical composition, specific surface area and pore volume of the merchant and calcined products were determined respectively by XRF chemical analysis and BET method. A solubility test of the product was carried out in sulphuric (1M) and citric....

Keywords: Tahoua merchant phosphate; calcination; solubility; citric acid; sulphuric acid

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[2]. Sayma,S., Sharba K., Phosphorus Fertilizer: The Original and Commercial Sources,2019.http://dx.doi.org/10.5772/intechopen.82240
[3]. Zanguina, A..,Natatou, I.., Moursalou ,K., Gado, T., Jean,L.L., Dissolution du phosphate naturel de Tahouaen milieu acide. Bulletin d'information de la SOACHIM ,2010. 007 :85-93
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[5]. Natatou, I., Almou, M., Zanguina, A., Ikhiri, K., Boss, A., Bougard, M.,Etude physico-chimique du phosphate marchand de Tahoua (Niger). Journal de la SociétéOuest-Africaine de Chimie, 2004. 018 : 137-148.

Abstract: Corrosion is a natural electro-chemical phenomenon, in which metals revert to their natural and lower energy state, which can be simply defined as rust. It is a result of the inherent tendency of metals to revert to their more stable compound such as oxides, hydroxide and sulphides. It can be defined as the deterioration of metals and its alloys by chemical or electrochemical means. Metals are found in the form of ores in nature. In the refining process, energy is added to the ore to produce the metal. It is the same energy process that provides the driving force causing the metal to revert back to the more stable compound ores. As we know aluminium is one of the most widely used metals. When it combines with other metals by thermo-mechanical processing, aluminium alloys display a marked improvement in mechanical properties and in presence of various corrosive agents including corrosive gases, mineral acids etc. aluminium and its alloys get corroded and they loss their properties. In the present study....

Keywords: Weight loss, Thermometric, Surface coverage, Inhibition efficiency, Corrosion rate, Phyllanthus niruri.

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Abstract: Background: Present work deals with the assessment of Physico-chemical parameters of water samples of Hau River in An Giang and Can Tho Provinces in Vietnam with six sampling sites each. This is because there has been increasing land use around Hau River in the recent past whose activities significantly affect water quality parameters, therefore, making it crucial to assess the water quality in these areas. Materials and methods: The water samples were collected and analyzed monthly from January to December 2019. The purpose of this study was to assess the water quality parameters along the Hau River to establish the possible setbacks associated with its deterioration and thus derive recommendations.A correlation matrix was used to determine Pearson's correlation coefficient (r) value to identify the water quality parameters that were both highly correlated and interrelated.Differences in each pair of parameters were analyzed using multivariate means in Minitab software Version 19.2020.1.0....

Keywords: Water quality; Pearson's correlation; Anthropogenic; Deterioration

[1]. Hedrick, Michael S., et al. 'Special Issue on Aquaculture: New Opportunities to Address Global Food Supply for Comparative Biochemistry and Physiology.'Comparative Biochemistry and Physiology Part - B: Biochemistry and Molecular Biology, vol. 233, no. March, 2019, pp. 1–3, DOI:10.1016/j.cbpb.2019.03.005.
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[5]. Senthilmanickam, J., et al. 'A Study on Physico-Chemical Properties of Water Samples from Cauvery River of Pallipalayam Town, Namakkal District of Tamil Nadu, India.'International Journal of Advanced Science and Engineering, vol. 2, no. 4, 2016, pp. 193–99..

Abstract: Background: Coconut oil is a food supplement derived from the Cocos nucifera L of Cocoideae subfamily and Arecaceae family, the oil is obtained from coconut kernel and it is anatural functional oil. This study was undertaken to evaluate the physical, proximate, phytochemical composition and the effect of coconut oil on lipid profile indices of albino rats. Materials and Methods:The proximate analysis was according to AOCS, phytochemical analysis was carried out with GC-FID.Thirty-five (35) albino rats were used for the lipid profile evaluation. Two phases of experiment with four (4) groups of male albino rats comprising of five (5) animals each, averagely weighing 180g-200g were employed. Phase 1 of the experiment....

Keywords: Coconut oil; Proximate; Phytochemical; Lipid profile

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