Study of macroaggregate composition using FT-IR and 1H-NMR spectroscopy |
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| Affiliation: | 1. Marine Biological Station, National Institute of Biology, Fornace 41, 6330 Piran, Slovenia;2. Faculty of Chemistry and Chemical Technology, University of Ljubljana, Askerceva 5, 1000 Ljubljana, Slovenia;3. National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia;1. College of Physics, Jilin University, Changchun, PR China;2. Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda 669-1337, Japan;3. College of Materials Science and Engineering, Jilin University, Changchun, PR China;1. Research & Development, Advanced Science & Technology Division, Johnson & Johnson Vision Care Inc., FL, 32256, USA;2. Universidad Tecnologica Emiliano Zapata del Estado de Morelos UTEZ, Av. Universidad Tecnologica No. 1, Col. Palo Escrito, Emiliano Zapata, Mor., 62760, Mexico;3. Centro de Caracterización e Investigación en Materiales S.A. de C.V., Calle 21 Este #205, Bodega F, Col. Civac, Jiutepec, Mor., 62578, Mexico;1. Department of Environmental Engineering, Faculty of Engineering and Research Center for Environmental and Hazardous Substance Management, Khon Kaen University, Khon Kaen, 40002, Thailand;2. Center of Excellence on Hazardous Substance Management (HSM), Chulalongkorn University, Bangkok, 10330, Thailand;3. Research Center for Water Environment Technology, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo, 113-8656, Japan;4. Department of Urban Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo, 113-8656, Japan;1. School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, PR China;2. Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510006, PR China;3. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China;4. Water Pollution Research Department, National Research Centre, Giza 12622, Egypt;1. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China;2. Qinghai Technology Research and Development Center of Comprehensive Utilization of Salt Lakes Resources, Xining, Qinghai 810008, China;3. Qinghai Provincial Key Laboratory of Resources and Chemistry of Salt Lakes, Xining, Qinghai 810008, China |
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| Abstract: | Mucous macroaggregates, recently observed in the northern Adriatic in summer of 1997 and late spring of 2000, are primarily the product of phytoplankton (diatom) exudates during favourable environmental conditions in late spring, and can be viewed as macrogels. The FT-IR and 1H-NMR spectra of macroaggregate samples from the northern Adriatic, collected in different formation stages in July 1997, August 1997, September 1997 and June 2000, as well as of cultured diatom Skeletonema costatum, showed that they are similar and composed of aliphatic components and polysaccharides bonded through carboxylic and amide groups, and organosilicon compounds. The stability of macrogels of macroaggregates is, according to FT-IR and X-ray analyses, most probably enhanced by interactions with entrapped particles of calcite, quartz and clay minerals. These organic-mineral associations seem to be important for mucous phenomena. According to 1H-NMR spectra, the temporal differences in macroaggregate composition show a relative increasing percentage of organosilicon compounds and aliphatic components bonded to carbohydrates through ester and amide groups, and an increasing ratio between aliphatic structures and carbohydrates. This indicates that aliphatic chains bonded to Si and carbohydrates may contribute to the persistence and stability of macroaggregates in the summer stratified waters in the northern Adriatic, while the temporal decrease of carbohydrate content is most probably due to microbial and photochemical degradation of algal reserve polysaccharides. |
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