Analisis Senyawa Piren pada Alga Laut Eucheuma cottoni Di Perairan Kabupaten Bantaeng

The compounds pyrene is one of the polycyclic aromatic hydrocarbons (HAP) which is derived from petroleum. These compounds are carcinogenic and toxic for the marine biota. The purpose of this study to determine the levels of pyrene compounds in marine algae. In this research, analysis of pyrene compounds in marine algae Eucheuma cottonii using the method of GC - MS (Gas Chromatography - Mass spectrophotometry). Sampling was conducted in the waters the Bantaeng Regency with a 6 point sampling different locations namely Nipa-nipa, Bakara, Boroloe, Tapaloe, Baruga village and Baruga. The results showed that the concentration of pyrene compounds found in marine algae Eucheuma cottonii at 6 locations in waters the Bantaeng Regency has a concentration low enough pyrene compounds that is 0009-0063 ppm. This means that the concentration of pyrene was obtained below the threshold value determined by the decision of national of Environmental ministry for the marine life

Analisis Senyawa Piren pada Alga Laut Eucheuma cottoni Di Perairan Kabupaten Bantaeng

The compounds pyrene is one of the polycyclic aromatic hydrocarbons (HAP) which is derived from petroleum. These compounds are carcinogenic and toxic for the marine biota. The purpose of this study to determine the levels of pyrene compounds in marine algae. In this research, analysis of pyrene compounds in marine algae Eucheuma cottonii using the method of GC - MS (Gas Chromatography - Mass spectrophotometry). Sampling was conducted in the waters the Bantaeng Regency with a 6 point sampling different locations namely Nipa-nipa, Bakara, Boroloe, Tapaloe, Baruga village and Baruga. The results showed that the concentration of pyrene compounds found in marine algae Eucheuma cottonii at 6 locations in waters the Bantaeng Regency has a concentration low enough pyrene compounds that is 0009-0063 ppm. This means that the concentration of pyrene was obtained below the threshold value determined by the decision of national of Environmental ministry for the marine life

Analisis Senyawa Piren pada Alga Laut Eucheuma cottoni Di Perairan Kabupaten Bantaeng

The compounds pyrene is one of the polycyclic aromatic hydrocarbons (HAP) which is derived from petroleum. These compounds are carcinogenic and toxic for the marine biota. The purpose of this study to determine the levels of pyrene compounds in marine algae. In this research, analysis of pyrene compounds in marine algae Eucheuma cottonii using the method of GC - MS (Gas Chromatography - Mass spectrophotometry). Sampling was conducted in the waters the Bantaeng Regency with a 6 point sampling different locations namely Nipa-nipa, Bakara, Boroloe, Tapaloe, Baruga village and Baruga. The results showed that the concentration of pyrene compounds found in marine algae Eucheuma cottonii at 6 locations in waters the Bantaeng Regency has a concentration low enough pyrene compounds that is 0009-0063 ppm. This means that the concentration of pyrene was obtained below the threshold value determined by the decision of national of Environmental ministry for the marine life

Potensi Biomassa Rhizoma dan Daun Lamun Kering Thalassia hemprichii yang Terdapat di Pulau Barrang Lompo sebagai Biosorben Ion Logam Cu(II)

Bioma 2(2) 2008Biosorpsi merupakan metode alternatif yang dapat digunakan dalam mengatasi pencemaran lingkungan yang berasal dari buangan limbah yang mengandung polutan logam berat. Biosorpsi ion logam Cu(II) oleh biomassa rhizoma dan daun lamun kering Thalassia hemprichii telah dilakukan pada variasi waktu kontak, pH larutan dan konsentrasi awal ion logam tersebut. Metode yang digunakan adalah metode ???batch??? dan konsentrasi ion logam Cu(II) sebelum dan sesudah biosorpsi diukur dengan spektrofotometer serapan atom (SSA). Kesetimbangan dicapai sesudah 30 menit. Efektivitas adsporpsi bagi ion logam Cu(II) dicapai pada pH 3. Biosorpsi ion Cu(II) dengan menggunakan biomassa rhizoma dan daun lamun Thalassia hemprichii lebih sesuai dengan model isothermal Langmuir dengan nilai kapasitas adsorpsi (Qe) ~ 37 mg/g

Vibrational Raman optical activity of biomolecules

Traditionally, spectroscopic studies of chiral molecules have centered on electronic optical activity, usually measured as optical rotation or circular dichroism of visible and near-ultraviolet radiation. However, over the past two decades advances in optical and electronic technology have enabled optical activity measurements to be extended into the vibrational spectrum using both infrared and Raman techniques (Barron, 1982; Diem, 1993). It is now well established that vibrational optical activity opens up a whole new world of fundamental studies and practical applications

Role of hydration in determining the structure and vibrational spectra of L-alanine and N-acetyl L-alanine N'-methylamide in aqueous solution: a combined theoretical and experimental approach

In this work we have utilised recent density functional theory Born-oppenheimer molecular dynamics simulations to determine the first principles locations of the water molecules in the first solvation shell which are responsible for stabilizing the zwitterionic structure of L-alanine. Previous works have used chemical intuition or classical molecular dynamics simulations to position the water molecules. In addition, a complete shell of water molecules was not previously used, only the water molecules which were thought to be strongly interacting (H-bonded) with the zwitterionic species. In a previous work by Tajkhorshid et al. (J Phys Chem B 102:5899) the l-alanine zwitterion was stabilized by 4 water molecules, and a subsequent work by Frimand et al. (Chem Phys 255:165) the number was increased to 9 water molecules. Here we found that 20 water molecules are necessary to fully encapsulate the zwitterionic species when the molecule is embedded within a droplet of water, while 11watermolecules are necessary to encapsulate the polar region with themethyl group exposed to the surface, where it migrates during the MD simulation. Here we present our vibrational absorption, vibrational circular dichroism and Raman and Raman optical activity simulations, which we compare to the previous simulations and experimental results. In addition, we report new VA, VCD, Raman and ROA measurements for l-alanine in aqueous solution with the latest commercially available FTIR VA/VCD instrument (Biotools, Jupiter, FL, USA) and Raman/ROA instrument (Biotools). The signal to noise of the spectra of l-alanine measured with these new instruments is significantly better than the previously reported spectra. Finally we reinvestigate the causes for the stability of the Pp structure of the alanine dipeptide, also called N-acetyl-l-alanine N-methylamide, in aqueous solution. Previously we utilized the B3LYP/6-31G* + Onsager continuum level of theory to investigate the stability of the ALANMA4WC Han et al. (J Phys Chem B 102:2587) Here we use the B3PW91 and B3LYP hybrid exchange correlation functionals, the aug-cc-pVDZ basis set and the PCMand CPCM (COSMO) continuum solvent models, in addition to the Onsager and no continuum solvent model. Here by the comparison of the VA, VCD, Raman and ROA spectra we can confirm the stability of the NALANMA4WC due to the strong hydrogen bonding between the fourwatermolecules and the peptide polar groups. Hence we advocate the use of explicit water molecules and continuum solvent treatment for all future spectral simulations of amino acids, peptides and proteins in aqueous solution, as even the structure (conformer) present cannot always be found without this level of theory