The research explored the extraction techniques of organic solvents of Antarctic kril oil and the effects of freezing temperature, extractant proportion, ex-traction time, drying temperature and ratio of material and ...The research explored the extraction techniques of organic solvents of Antarctic kril oil and the effects of freezing temperature, extractant proportion, ex-traction time, drying temperature and ratio of material and liquid on extraction ratio of Antarctic kril oil. Based on single-factor experiments, optimal extraction conditions were concluded as per response surface methodology, as fol ows: freezing tempera-ture at -38.5 ℃, the ratio of material and liquid at 1 g:6.7 ml, and drying tempera-ture at 66.8 ℃, where the yield rate of crude oil reached 13.71%.展开更多
A 90-day experiment was conducted to investigate the effects of different dietary linoleic acid (LA; 18:2n-6) and linolenic acid ratios (LNA; 18:3n-3) on growth induces, feed utilization and tissue fatty acid pr...A 90-day experiment was conducted to investigate the effects of different dietary linoleic acid (LA; 18:2n-6) and linolenic acid ratios (LNA; 18:3n-3) on growth induces, feed utilization and tissue fatty acid profile of freshwater prawn, Macrobrachium rosenbergii post-larvae (PL). The experiment was conducted in cubic indoor fiberglass tanks, each holding 700 L in triplicate. Post-larvae with an average weight of 20.8 ± 0.20 mg were stocked at 80 PL m2. Five experimental isocaloric (15.06 MJ kgl digestible energy), and isonitrogenous (30.45% digestible protein) diets were formulated by blending of soybean oil and linseed oil to containing five dietary LA/LNA ratios (7.80, 2.75, 1.28, 0.65 and 0.30). The highest survival values were recorded for prawn PL fed diet containing 0.65 LA/LAN ratios. Growth indices of PL significantly increased (P 〈 0.05) with decreased dietary LA/LAN ratios to 0.65. The same trend was observed for the highest (P ≤ 0.05) protein efficiency ratio, protein productive value, fat retention, energy retention and best feed conversion ratio. The total whole tissue polyunsaturated fatty acid composition of M. rosenbergii PL was dominated by LA followed by LAN. Post larvae fed the diets containing higher LA/LNA ratios showed a higher tissue LA/LNA ratio. The obtained findings revealed that fatty acid patterns ofM. rosenbergii PL were influenced by fatty acid profiles of diets. The diet containing 0.65 LA/LNA ratio is recommended to obtaining optimum growth performance and feed utilization for M. rosenbergii PL.展开更多
基金Supported by Postgraduate Scientific Research Foundation(A-2500-11-0079)Shanghai Engineering Research Center of Aquatic-Product Processing&Preservation Foundation(11DZ2280300)Aquaculture Genetics and Breeding Technology Center in Shanghai Ocean University(ZF1206)~~
文摘The research explored the extraction techniques of organic solvents of Antarctic kril oil and the effects of freezing temperature, extractant proportion, ex-traction time, drying temperature and ratio of material and liquid on extraction ratio of Antarctic kril oil. Based on single-factor experiments, optimal extraction conditions were concluded as per response surface methodology, as fol ows: freezing tempera-ture at -38.5 ℃, the ratio of material and liquid at 1 g:6.7 ml, and drying tempera-ture at 66.8 ℃, where the yield rate of crude oil reached 13.71%.
文摘A 90-day experiment was conducted to investigate the effects of different dietary linoleic acid (LA; 18:2n-6) and linolenic acid ratios (LNA; 18:3n-3) on growth induces, feed utilization and tissue fatty acid profile of freshwater prawn, Macrobrachium rosenbergii post-larvae (PL). The experiment was conducted in cubic indoor fiberglass tanks, each holding 700 L in triplicate. Post-larvae with an average weight of 20.8 ± 0.20 mg were stocked at 80 PL m2. Five experimental isocaloric (15.06 MJ kgl digestible energy), and isonitrogenous (30.45% digestible protein) diets were formulated by blending of soybean oil and linseed oil to containing five dietary LA/LNA ratios (7.80, 2.75, 1.28, 0.65 and 0.30). The highest survival values were recorded for prawn PL fed diet containing 0.65 LA/LAN ratios. Growth indices of PL significantly increased (P 〈 0.05) with decreased dietary LA/LAN ratios to 0.65. The same trend was observed for the highest (P ≤ 0.05) protein efficiency ratio, protein productive value, fat retention, energy retention and best feed conversion ratio. The total whole tissue polyunsaturated fatty acid composition of M. rosenbergii PL was dominated by LA followed by LAN. Post larvae fed the diets containing higher LA/LNA ratios showed a higher tissue LA/LNA ratio. The obtained findings revealed that fatty acid patterns ofM. rosenbergii PL were influenced by fatty acid profiles of diets. The diet containing 0.65 LA/LNA ratio is recommended to obtaining optimum growth performance and feed utilization for M. rosenbergii PL.