Top PageAt first, his analysis about Laminaria sp. collected from Mouritania Sea by FT-IR, elemental analysys and 13C CP-MAS NMR revealed polysaccharide humic substances-like material was the major insoluble material from Laminaria. Then, he collected marine and coastal humic sunstances extracted from Hakata Bay at Fukuoka, Japan. The humic substances was analysed by UV, IR, GC-MS, Py-GC-MS and 1H NMR. The humic sucstances from Hakaya Bay resembled from marine humic substances and the presence of a wide range of biologically relaed material such as proteins, carbohydrates, lipids, and phenols were observed. These organic sediments are primarily influenced probably by the nature and importance of aquatic plants, algae and animal biomasses at the coastal region and basin. Also, the extraction procedure change the "humic substances" of marine origin. That means the extraction standard procedure is improtant and often overestimate the content of carbohydrate origin of insoluble material in th humic substances at coastal region.
Investigation of humic substances in Sediments and Seawater of Hakata Bay and Humic-type Substances in Algae of Mauritania Sea. Dadda ould Ballala Dr. Thesis at Kyushu University (2000).
D.O. Balalla, T. Murae: Spectroscopic comparison of two methods extractiong humic acids from marine sediments. The 17th symposium of organic geochemisty in Japan Hirosaki, Japan (1999).
D. O. Ballala and T. Murae Res. Org. Geochem., 2001, 16, 39.
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