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Undergraduate Theses

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Committee Chair: search.filters.chair.Pahila, Ida G.SDG: search.filters.sdg.SDG 12 - Responsible consumption and production

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    Bioaccumulation of cadmium, copper and lead by Hydrilla (Hydrilla vericillata)
    Baniago, Arjay C. (Division of Pysical Sciences and Mathematics, College of Arts and Sciences, University of the Philippines Visayas, 2007-04)
    Bioaccumulation of cadmium, copper, and lead by Hydrilla (Hydrilla verticillata) were tested to 5 different initial concentrations. The water contaminant sample was composed of mixed cadmium, copper and lead metals supplied as nitrate salts. These were analyzed for the decrease in concentrations at 24-hour intervals for 5 days using the SpectrAA 55B Atomic Absorption Spectrometer. Plants exposed only for 5 days were digested and analyzed. The plant growth was normal at lower concentrations and showed higher removal efficiency. H. verticillata showed maximum removal percentage on the 5th day of exposure at 5 mg L-1 for cadmium (90.47%) and copper (95.20%) but for lead was on the 1st day (96.74%). The order of metal ion removal and the actual uptake for the three metals by H. verticillata is Pb>Cu>Cd, but at lower concentration, cadmium was absorbed more than copper. The copper and lead uptakes by H. verticillata are superior as compared to other aquatic plants uptakes. Lead uptake at higher concentrations might be due to physicochemical adsorption of the metal to the plant components and not on metabolism-mediated uptake, because plant condition does not have an adverse effect on the uptake
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    Comparing the quercetin content of different Allium sp. by spectrophotometry
    Asuelo, Allen Daryl F. (Division of Physical Sciences and Mathematics, College of Arts and Sciences, University of the Philippines Visayas, 2007-04)
    Quercetin from two Allium sp. was extracted sequentially with solvents of varying degrees of polarity. The crude quercetin was subjected to chemical tests and the concentration determined by using Shimadzu mini UV-Vis 1240 Spectrophotometer. Results of the study showed that the extraction procedure used was effective in extracting quercetin. This was verified by the identical spectrum obtained with quercetin from the standard (Quercetin Complex) with the IR spectrum of quercetin obtained from the literature. The crude quercetin was positive to the both chemical tests, namely Baeyer's and Ferric chloride tests, subjected to it. Quercetin content in red onions was obtained with mean concentrations of 10.60 mg/kg at 362nm and 7.429 mg/kg at 370nm. Quercetin content in garlic was obtained with mean concentrations of 9.692 mg/kg at 362nm and 5.689 mg/kg at 370nm. The quercetin concentration measured at 370nm was quercetin another wavelength at 362nm measured the concentration of quercetin as flavonols. The result of One-way ANOVA at 0.05a showed that there is a significant difference in the quercetin content between red onions and garlic.