三种海产动物油中高度不饱和脂肪酸的提取     

吴红棉  蒋志红  常德秘 《广东海洋大学学报》1994,(1)

采用低温—盐形成法对蓝圆　Ｓｃｏｍｂｅｒｍｏｒｕｓｎｉｐｈｏｎｉｕｓ（Ｃｕｖｉｅｒ）、马鲛鱼Ｄｅｃａｐｔｅｒｎｓｍａｒｕａｄｓｉ（ＴｅｍｍｉｎｃｋｅｔＳｃｈｌｅｇｅｔ）、海蛇三种海产动物油中高度不饱和脂肪酸进行提取，经皂化、冷冻、过滤、酸化、离心等工序反复处理后，可得碘价为２２０～２５０的高度不饱和脂肪酸混和物。探讨了提取过程中的最适工艺条件，并比较了该三种海产动物脂质中的高度不饱和脂肪酸的含量。  相似文献   

Effect of n?3 HUFA levels in rotifers and Artemia on growth and survival of larval black sea bream ( Sparus macrocephalus )     

Liu Jingke  Li Kuiran  Huang Bingxin  Chen Xiaolin 《中国海洋湖沼学报》2004,22(4):421-424

Requirement for dietary n−3 HUFA (n−3 highly unsaturated fatty acid) for growth and survival of black sea bream (Sparus macrocephalus) larvae was studied using rotifers andArtemia at various levels of n−3 HUFA. Five treatments with rotifers andArtemia differing in n−3 HUFA were prepared by enriching them with various oil emulsions. Results indicated that dietary n−3 HUFA significantly influence fish n−3 HUFA levels and are essential for growth and survival of black sea bream larvae. The results also indicated that the incorporation of n−3HUFA TG (triacylglycerols) into tissues of larval black sea bream was more effective from natural fish oil in comparison with n−3 HUFA fatty acid ethyl esters from ethyl-esterified oil. Project No. 39770588 supported by the NSFC.  相似文献   

大獭蛤软体部营养成分的分析与评价   总被引：1，自引：0，他引：1  

潘英  秦小明  潘红平 《广东海洋大学学报》2007,27(3):78-81

对大獭蛤(Lutraria maxima)软体部进行营养成分分析,并对其营养价值进行综合评定。结果表明,大獭蛤软体部粗蛋白含量为81.20%,干物质中水解氨基酸总量为83.50%,其中必需氨基酸为30.22%,占氨基酸总量的36.19%;氨基酸中6种呈味氨基酸含量丰富,占氨基酸总量的53.81%;大獭蛤软体部第一限制氨基酸为亮氨酸;矿物质含量丰富。可见,大獭蛤软体部营养价值高,呈味特性良好。  相似文献   

Behaviour of iron,manganese, phosphate and humic acid during mixing in a Delaware salt marsh creek     

Kurt W. Eastman  Thomas M. Church 《Estuarine, Coastal and Shelf Science》1984,18(4):447-458

The mixing behaviour of iron, manganese, phosphate and humic acid in a Delaware salt marsh creek was studied using field data, laboratory mixing experiments, and geochemical mass balance equations. Property-salinity diagrams for field data indicated that the removal of iron is 56–70% in the 0–10‰ salinity range. A proposed mechanism of removal is the flocculation of colloidal iron, perhaps with humic acid. Phosphate, however, undergoes 195% addition in the same low salinity region, which may be due to release of phosphate from resuspended sediments. Dissolved manganese is conserved, as is humic acid throughout the salt marsh mixing zone. Within the uncertainty of the data the maximum possible removal of humic acid is 23%.Laboratory mixing experiments that simulated salt marsh mixing along the same salinity gradient as observed in the field (5–25‰) showed only small-scale additions and removals compared to the field results. Such small-scale changes occurred largely at salinities >10‰ in the laboratory experiments, whereas most removals and additions occurred at salinities <10‰ in the field. Mixing studies also showed little difference between prefiltered and unfiltered mixes. The studies suggest that simple mixing of salt marsh waters, with or without suspended material, does not strongly influence the observed behaviour of dissolved constituents in salt marshes, and that other processes (e.g. sediment or intertidal exchange) must dominate their behaviour.  相似文献   

The amino acid composition of estuarine colloidal material     

A.C. Sigleo  P.E. Hare  G.R. Helz 《Estuarine, Coastal and Shelf Science》1983,17(1):87-96

Amino acids were determined in estuarine colloidal and particulate material from near surface waters ranging from fresh to brackish water (12 g kg^?1 salinity). The hydrolizable amino acids and associated ammonia account for an average of 80% of the nitrogen present in colloidal samples, and approximately 75% of the nitrogen from particulate fractions of the same samples. The relative proportions of these amino acids are similar to those of a cultured estuarine diatom. There are no significant amounts of D amino acids, or non-protein amino acids characteristic of bacteria in sediments and soil. A single deep-water sample (25 m) shows some evidence of bottom mud resuspension by the presence of a possible aspartic acid-hydroxyproline dimer.  相似文献   

Properties of humic acids as biomarkers of lake catchment management   总被引：1，自引：0，他引：1  

Joanna?CieslewiczEmail author  Slawomir?S.?Gonet 《Aquatic Sciences - Research Across Boundaries》2004,66(2):178-184

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Composition and major sources of organic compounds in urban aerosols     

Xinhui Bi  Bernd R.T. Simoneit  Guoying Sheng  Shexia Ma  Jiamo Fu   《Atmospheric Research》2008,88(3-4):256-265

Total suspended particles (TSP), collected during June 2002 to July 2003 in Guangzhou, a typical economically developed city in South China, were analyzed for the organic compound compositions using gas chromatography–mass spectrometry (GC/MS). Over 140 organic compounds were detected in the aerosols and grouped into different classes including n-alkanes, hopanoids, polycyclic aromatic hydrocarbons, alkanols, fatty acids, dicarboxylic acids excluding oxalic acid, polyols/polyacids, lignin products, phytosterols, phthalates and water-soluble sugars. The total amounts of the identified organic compounds including unresolved complex mixture (UCM) ranged from 3112 ng/m³ in spring to 5116 ng/m³ in winter, comprising on seasonal average 2.8% of TSP. Primary organic compounds peaked in winter although there are no heating systems burning fuels in Guangzhou. The highest saccharide levels occurred in fall due to agricultural activities. This study demonstrated that utilization of fossil fuels, biomass burning, soil resuspension and plastic/refuse burning are the major contributors to the identified organic compounds in the urban atmosphere of South China.  相似文献   

Application of Greek lignite as an additive for controlling rheological and filtration properties of water–bentonite suspensions at high temperatures: A review     

Vassilios C. Kelessidis  Cassiani Papanicolaou  Antonios Foscolos 《International Journal of Coal Geology》2009,77(3-4):394-400

This review paper presents the results of an extensive study investigating whether addition of 3% w/w Greek lignite to 6.42% w/w water–bentonite suspensions, after being exposed to high temperatures, can prevent gelation and control filtration characteristics. Two different bentonites and eight lignites from different Greek basins have been used while a commercial lignite product has been used as standard. The lignite-free bentonite suspensions heated to 177 °C for 16 h (thermal aging) thicken considerably, increasing the yield stress and the yield point. Fluid consistency and flow behavior indices also change while no significant change is observed for plastic viscosity. Thermal aging of the suspensions results in unacceptably high fluid loss values.Addition of Greek lignite to water–bentonite suspensions, followed by thermal aging, provided the rheological stability of the suspensions by maintaining the low yield stress/point regardless of the type of bentonite. Some of the lignites performed as well as their commercial counterpart. No specific trends for rheological improvement have been identified with respect to various characteristics of lignites such as contents of humic, fulvic acids, humins and other parameters such as specific surface area and cation exchange capacity.Furthermore, addition of lignite in most cases provided very good filtration control of the water–bentonite suspensions after exposure to 177 °C, with some Greek lignites being superior to the commercial product. The same lignite parameters examined for rheological control, were also examined to determine their effect on fluid loss of these suspensions for both bentonites. The content of humic and fulvic acids of two groups of lignites showed weak inverse correlations with the fluid loss volumes for both bentonites, while all other parameters did not seem to directly correlate with the effectiveness of the lignites.  相似文献   

养殖海鲡肌肉的生化组成     

李刘冬  陈毕生  冯娟  柯浩  蔡景心  范楷 《广东海洋大学学报》2001,21(1):30-34

对海鲡肌肉的营养成分含量及氨基酸、脂肪酸、无机质组成进行了研究，结果表明，海鲡的蛋白质和脂肪含量分别为21.5%和5.5%，必需氨基酸和鲜味氨基酸分别占氨基酸总量的40.9%和37.8%，不饱和脂肪酸占脂肪酸总量的65.2%，其中C205和C226的含量分别为4.5%和12.0%，3.4kg阶段的养殖海鲡肌肉的必需氨基酸和呈味氨基酸的比率最高。  相似文献   

西北太平洋低纬度区域海水中溶解氨基酸的分布及组成研究   总被引：1，自引：1，他引：0  

张宁  陈岩  高先池  杨桂朋 《海洋科学》2020,44(5):60-70

本文对2018年秋季西北太平洋低纬度区域上层海洋(5~200 m)中溶解氨基酸(THAA)的分布和组成进行了研究。结果表明,该海域表层海水中THAA的浓度范围为0.40~0.97μmol/L,平均浓度为0.58±0.14μmol/L;5~200m垂直断面上THAA的平均浓度为0.59±0.16μmol/L,范围为0.30~1.05μmol/L。调查海域内THAA浓度明显低于中国近海,在5~200m内的垂直分布基本表现出随深度增加而增加的趋势。将表层和垂直水体中的THAA分别与DOC、Chla等环境因子进行相关性分析,结果显示均无显著相关性。西北太平洋低纬度区域海水中的优势氨基酸是天冬氨酸(Asp)、谷氨酸(Glu)、丝氨酸(Ser)、甘氨酸(Gly)、苏氨酸(Thr)和丙氨酸(Ala)。基于氨基酸的碳归一化产率(THAA-C%)、降解因子(DI)值,表明该海域表层海水中的有机质降解程度较高,且随深度的增加而降低。  相似文献