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Studies on water-extractable carbohydrates of the particulate matter from the northwest Pacific Ocean

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Abstract

We have studied carbohydrate metabolism in the marine environment by means of the isolation and characterization of carbohydrates of particulate matter from various depths. The present work is especially concerned with water-extractable carbohydrates of the particulate samples from 11 stations of the northwest Pacific Ocean. Water-extractable carbohydrate content in the particulate matter of the surface waters was measured; it ranged from 19.2 to 36.0% of the total particulate carbohydrate. These values decreased, ranging from 6.5 to 15.5% at 50 m depth. Such rapid vertical change of the concentration of the carbohydrate indicated that it was lost from the particulate matter much faster than the other particulate organic constituents such as protein and water-insoluble carbohydrate. This process left water-insoluble carbohydrate in the deep-water particulate matter as previously observed in the Sagami Nada, off eastern Honshu, Japan. Upon acid hydrolysis, water-extractable carbohydrate revealed glucose ranging from 67.0 to 84.2%. Rhamnose, fucose, ribose, arabinose, xylose, mannose and galactose were also identified as components of the carbohydrate fraction. Carbohydrate studies on the laboratory cultured diatoms clearly indicated that the water-extractable carbohydrates were food reserve materials of the diatoms. In view of this fact, the metabolism of the water-extractable carbohydrate in the euphotic zone and its underlying layer is discussed.

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Communicated by M. Anraku, Nagasaki

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Handa, N., Yanagi, K. Studies on water-extractable carbohydrates of the particulate matter from the northwest Pacific Ocean. Mar. Biol. 4, 197–207 (1969). https://doi.org/10.1007/BF00393893

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