Effect of N-acetylation on the Acidic Solution Stability and Permeability of Membranes Prepared from Different Chain Flexibility Chitosans

N-乙醯化對由不同鏈柔軟度的幾丁聚醣所制備的膜的酸性溶液安定性與滲透系數的影響

陳榮輝(Rong-Huei Chen) ； 華宏達(Hung-Dao Hua) ； 黃俊儒(Jin-Ru Huang)

《臺灣水產學會刊》 25卷4期 (1998/12) Pp. 303-311

https://doi.org/10.29822/JFST.199812.0008

摘要

在1993年3月間於台灣西南海域中，從大陸棚到深海處選擇了26個測站採集沈積物，以便進行其底棲動物群集、細菌數量及沈積物中的化學及物理特性之分析。沈積物主要是由細小的顆粒所組成的（平均顆粒大小介於12到139微米之間）。底棲動物之群落以甲殼類、多毛類及有殼的軟體動物為主。每克沈積物中約含4.2×10^(9)到5.2×10^(10)細菌量。細菌總量約佔沈積物總有機碳重之0.05到0.1％之間。這個比例並不會隨著深度增加而增加或減少之。沈積物之碳氮比值會隨著深度增加而減少；這可能是因為有機氮中的腐植值會隨著深度增加而增加之故。底棲動物的物種豐度會隨著深度增加而減少，這主要是因為沉機物中的細泥含量會隨著深度而增加而食物的可利用度會隨著深度而減少之故。

關鍵字

幾丁聚醣 ； 膜 ； N-乙醯化 ； 酸性溶液安定性 ； 孔洞大小 ； 鏈柔軟度

並列摘要

Sediment from 26 stations of the continental shelf to the deep-sea southwest ofTaiwan was sampled in March 1993.The macrofaunal assemblages,bacterial abundanceand chemical and geological characters were assessed.The sediment was composed mainly of fine-grained particles(mean grain size rangedfrom 12 to 139μm).Macrofauna assemblages were dominated by crustaceans,polychaetes,and shell-bearing mollusk.Bacterial abundances ranged from 4.2×10^(9)to 5.2×10^(10)cells(g sediment)^(-1).Bacterial biomass contributed from 0.05 to 1% to the totalorganic carbon,and no trend of increase or decrease in this value with depth wasobserved.The sediment C:N ratio decreased with depth,which was due mainly to theincrease in the humus fraction of sediment organic nitrogen.The decrease in macrofaunalrichness with increasing depth might have resulted mainly from the increase in mudcontent and decrease of food availability with depth.

並列關鍵字

Chitosan ； Membrane ； N-Acetylation ； Acidic Solution Stability ； Pore Size ； Permeability ； Chain Flexibility