The seaweed Sargassum hemiphyllum is widely distributed throughout the coastal waters of Asia and has high commercial value. In recent years, its natural biomass has declined due to over-exploitation and environmental...The seaweed Sargassum hemiphyllum is widely distributed throughout the coastal waters of Asia and has high commercial value. In recent years, its natural biomass has declined due to over-exploitation and environmental pollution. To seek for a feasible way to culture this seaweed efficiently, we designed a simple long-line system in a shrimp pond for the culture during winter, and the growth and nutritional composition of the seaweed were examined. Results show that the cul^re system was durable and flexible allowing S. hemiphyllum to grow vertically offthe muddy bottom of the pond. Although the length of pond- cultured S. hemiphyllum was inhibited by water depth, the weight-specific growth rate （（1.65±0.17）%/d） was nearly three times higher than that of wild plants （（0.62±0.19）%/d）. The crude protein （6.92%±0.88%） and ash content （21.52%±0.07%） of the pond-cultured seaweed were significantly lower than those of the wild plants （9.38%±-0.43% and 26.93%±0.07%, respectively）; however, crude fat （1.01%±0.04%） was significantly higher than that of the wild plants （0.87%±0.02%）. In addition, the nutritional composition of both pond-cultured and wild S. hemiphyllum was comparable to or even higher than those of other common seaweeds being used as food and/or aquaculture fodder. Future studies shall be focused on the impact of environmental parameters on its growth and nutritional composition.展开更多
Brown algae are well known as a source of biologically active compounds, especially those having antioxidant activities, such as phlorotannins. In this study we examined the antioxidant activities of crude phlorotanni...Brown algae are well known as a source of biologically active compounds, especially those having antioxidant activities, such as phlorotannins. In this study we examined the antioxidant activities of crude phlorotannins extracts（CPEs） obtained from Sargassum hemiphyllum（SH） and fractionated according to the molecular weights. When CPEs were administrated at a dose of 30 mg/kg to Kunming mice pre-treated with carbon tetrachloride（CCl4）, the levels of oxidative stress indicators in the liver, kidney and brain were significantly reduced in vivo. All the components of various molecular weight fractions of CPEs exhibited greater scavenging capacities in clearing hydroxyl free radical and superoxide anion than the positive controls gallic acid, vitamin C and vitamin E. Particularly, the components greater than 30 k D obtained from ethyl acetate phase showed the highest antioxidant capacities. These results indicated that SH is a potential source for extracting phlorotannins, the algal antioxidant compounds.展开更多
将半叶马尾藻(Sargassum hemiphyllum)置于实验室球形培养瓶内培养15 d,设置5个充气速率(50 m L/min、100 m L/min、200 m L/min、400 m L/min和800 m L/min)为实验组,静水培养(0)为对照组。每隔5 d测定藻体的生长速率和营养盐吸收速率...将半叶马尾藻(Sargassum hemiphyllum)置于实验室球形培养瓶内培养15 d,设置5个充气速率(50 m L/min、100 m L/min、200 m L/min、400 m L/min和800 m L/min)为实验组,静水培养(0)为对照组。每隔5 d测定藻体的生长速率和营养盐吸收速率,培养实验结束时,测定藻体的色素含量、可溶性蛋白和可溶性糖含量。结果表明:充气速率和培养时间均对半叶马尾藻的生长和PO34--P的吸收具有显著影响,而对NO3--N来说,仅培养时间对其吸收影响显著。培养第1天时,充气可显著促进营养盐吸收,最大充气速率(800 m L/min)培养的半叶马尾藻对NO3--N和PO34--P的吸收速率分别比静水培养的马尾藻高133.77%和89.51%,生长速率也比静水培养的马尾藻高95.04%。随着培养时间的延长,充气速率对半叶马尾藻的生长和营养盐吸收的促进作用逐渐减弱。在培养第15天时,充气速率为800 m L/min条件下的半叶马尾藻对NO3--N的吸收速率比静水培养的马尾藻低24.87%,对PO34--P的吸收速率仅高出静水培养下的46.03%,而生长比静水培养的马尾藻高出75.16%。同时,除了可溶性蛋白含量,高充气速率可抑制叶绿素a(Chla)、类胡萝卜素(Car)和可溶性糖合成。因此,水体运动是通过对营养盐吸收及其他生理过程产生的作用间接影响半叶马尾藻的生长,而不是直接影响半叶马尾藻生长和产量的最重要因素。展开更多
基金Supported by the Key Projects of the National Science and Technology Pillar Program during the 12th Five-year Plan Period(Nos.2011BAD13B02,2012BAD18B03)the Science and Technology Promoting Projects for Oceanic and Fishery in Guangdong Province(Nos. A201100D01,A201101D02)
文摘The seaweed Sargassum hemiphyllum is widely distributed throughout the coastal waters of Asia and has high commercial value. In recent years, its natural biomass has declined due to over-exploitation and environmental pollution. To seek for a feasible way to culture this seaweed efficiently, we designed a simple long-line system in a shrimp pond for the culture during winter, and the growth and nutritional composition of the seaweed were examined. Results show that the cul^re system was durable and flexible allowing S. hemiphyllum to grow vertically offthe muddy bottom of the pond. Although the length of pond- cultured S. hemiphyllum was inhibited by water depth, the weight-specific growth rate （（1.65±0.17）%/d） was nearly three times higher than that of wild plants （（0.62±0.19）%/d）. The crude protein （6.92%±0.88%） and ash content （21.52%±0.07%） of the pond-cultured seaweed were significantly lower than those of the wild plants （9.38%±-0.43% and 26.93%±0.07%, respectively）; however, crude fat （1.01%±0.04%） was significantly higher than that of the wild plants （0.87%±0.02%）. In addition, the nutritional composition of both pond-cultured and wild S. hemiphyllum was comparable to or even higher than those of other common seaweeds being used as food and/or aquaculture fodder. Future studies shall be focused on the impact of environmental parameters on its growth and nutritional composition.
文摘Brown algae are well known as a source of biologically active compounds, especially those having antioxidant activities, such as phlorotannins. In this study we examined the antioxidant activities of crude phlorotannins extracts（CPEs） obtained from Sargassum hemiphyllum（SH） and fractionated according to the molecular weights. When CPEs were administrated at a dose of 30 mg/kg to Kunming mice pre-treated with carbon tetrachloride（CCl4）, the levels of oxidative stress indicators in the liver, kidney and brain were significantly reduced in vivo. All the components of various molecular weight fractions of CPEs exhibited greater scavenging capacities in clearing hydroxyl free radical and superoxide anion than the positive controls gallic acid, vitamin C and vitamin E. Particularly, the components greater than 30 k D obtained from ethyl acetate phase showed the highest antioxidant capacities. These results indicated that SH is a potential source for extracting phlorotannins, the algal antioxidant compounds.
文摘将半叶马尾藻(Sargassum hemiphyllum)置于实验室球形培养瓶内培养15 d,设置5个充气速率(50 m L/min、100 m L/min、200 m L/min、400 m L/min和800 m L/min)为实验组,静水培养(0)为对照组。每隔5 d测定藻体的生长速率和营养盐吸收速率,培养实验结束时,测定藻体的色素含量、可溶性蛋白和可溶性糖含量。结果表明:充气速率和培养时间均对半叶马尾藻的生长和PO34--P的吸收具有显著影响,而对NO3--N来说,仅培养时间对其吸收影响显著。培养第1天时,充气可显著促进营养盐吸收,最大充气速率(800 m L/min)培养的半叶马尾藻对NO3--N和PO34--P的吸收速率分别比静水培养的马尾藻高133.77%和89.51%,生长速率也比静水培养的马尾藻高95.04%。随着培养时间的延长,充气速率对半叶马尾藻的生长和营养盐吸收的促进作用逐渐减弱。在培养第15天时,充气速率为800 m L/min条件下的半叶马尾藻对NO3--N的吸收速率比静水培养的马尾藻低24.87%,对PO34--P的吸收速率仅高出静水培养下的46.03%,而生长比静水培养的马尾藻高出75.16%。同时,除了可溶性蛋白含量,高充气速率可抑制叶绿素a(Chla)、类胡萝卜素(Car)和可溶性糖合成。因此,水体运动是通过对营养盐吸收及其他生理过程产生的作用间接影响半叶马尾藻的生长,而不是直接影响半叶马尾藻生长和产量的最重要因素。
