Showing 4 results for Pufa
S.s. Babaei , A. Abedian Kenari, M. Hedayati, M.a. Yazdani-Sadati,
Volume 7, Issue 3 (9-2018)
Abstract
Aims: In this study, the effect of dietary macronutrient composition (two levels of protein 44% and 38% with two carbohydrate/fatty ratios of 1.4 and 3) was studied during starvation and re-feeding with the aim of achieving growth, body composition, and fatty acids in the body of Siberian Sturgeon (Acipenser baerii, Brandt, 1869).
Materials & Methods: This experimental study was carried out at the International sturgeon research institute in a completely randomized design. 360 fish (with an initial weight of 30±5g) were randomly distributed in 24 tanks of 500 liters (15 fish per tank) with a volume of 350-400 liters capacity. Fish were fed on 4 different diets; protein 38% - carbohydrate: lipid ratio 3 (LP-St), protein 44% - carbohydrate: lipid ratio 3 (HP-St), protein 38% - carbohydrate: lipid ratio 1.4 (LP-L) and protein 44% - carbohydrate: lipid ratio 1.4 (HP-L), respectively. The fish were fed apparent satiation for 3 weeks, then, starved for two weeks, and, then, re-fed for 5 weeks. The results were analyzed, using SPSS 22 software by multivariate analysis of variance and Duncan's test.
Findings: Compensatory growth did not occur in any treatments. In the control group, the best growth was observed in HP-L, while after re-feeding, HP-St represented the best weight gain and feed conversion ratio
Conclusion: The dietary composition has a significant effect on the SFA, MUFA, and PUFA fatty acids, while the two weeks of starvation slightly increase only MUFA and have no significant effect on other fatty acids.
Seyed Fakhreddin Hosseini, Zahra Eskandari,
Volume 12, Issue 1 (12-2022)
Abstract
Omega-3 polyunsaturated fatty acids (ω-3PUFAs) have gained increasing interest in recent years due to their beneficial effects in maintaining heart health and regulating blood pressure, improving brain function, strengthening memory, and reducing depression. Fish and algae are known as the main sources of ω-3PUFAs. In the meantime, extracting fish oil from less-exploited species or fish waste not only creates higher added value, but also reduces environmental pollution caused by the process of disposal of fishery waste. In this study, the most common methods of oil extraction from marine sources, such as solvent-based methods (Soxhlet, Bligh and Dyer, and Folch Methods), supercritical fluid extraction (SFE) and enzymatic hydrolysis, along with their advantages and disadvantages, were investigated. Among them, Soxhlet extraction provides a high yield of lipids; Of course, choosing the right solvent is the most important factor in the effective extraction of lipids. However, continuous heating at the boiling temperature could lead to lipid oxidation and degradation of heat liable compounds. Therefore, development of alternative extraction and purification methods based on the use of green technologies and the sustainability principles, avoiding the use of organic solvents and high temperatures, is needed in order to produce omega-3 polyunsaturated fatty acids of higher purity and quality. Supercritical fluid extraction with environment-friendly solvents and enzymatic hydrolysis are the most promising green technologies for extracting fish oil, whereas pressurized extractions are suitable for extracting microalgae oil.
Volume 12, Issue 3 (7-2010)
Abstract
Changes in the fatty acid content, during frozen storage at -24°C of Caspian kutum (Rutilus frisii kutum), golden grey mullet (Liza aurata), common carp (Caprinus carpio), pike perch (Sander lucioperca) and common kilka (Clupeonella cultiventris caspia), caught from south Caspian Sea were studied in the present work. Changes in saturated fatty acids (SFAs), monounsaturated fatty acids (MUFAs), polyunsaturated fatty acids (PUFAs), ecosapentaenoic acid plus docosahexaenoic acid/palmitic acid (EPA+DHA/C16), n3 PUFA/n6 PUFA (n3/n6) and polyunsaturated fatty acids/saturated fatty acids (PUFA/SFA) were investigated during a six month period. Results indicated that due to the decrease in unsaturated fatty acids particularly PUFAs (9.25-23.03%), and lower ratios of n3/n6 (2.02-6.06), EPA+DHA/C16 (polyene index; 0.21-0.65) and PUFA/SFA (0.18-0.64) the poststorage nutritional values of these species significantly decrease.
Volume 20, Issue 7 (12-2018)
Abstract
The study was performed with 40 Simmental cows divided into four groups (treatments). The group I received diet with grass silage, maize silage, and concentrate. Group II was fed similar as group I plus 400 mg d-1 cow-1 of β-carotene. In group III, 40% maize silage DM was replaced with pumpkin silage to ensure a 400 mg higher β-carotene intake compared to the group I. In group IV, 60% of maize silage DM was replaced with pumpkin silage without balancing β-carotene. Milk samples were collected at 4 and 8 weeks of experiment. The milk was analyzed for the basic composition, carotenoids, Total Antioxidant Status (TAS), and composition of fatty acids. In both measurements, the highest content of α-carotene, β-carotene, lutein, violaxanthin were in the milk of group IV, and the lowest in group I. In the milk groups III and IV, higher content of PUFA, including n-3 PUFA, was found in successive samplings. In all samplings, milk TAS in group I was significantly lower compared to groups III and IV.
