Showing 3 results for Extraction Methods
M.m. Taati Keley , B. Shabanppour, S.m. Ojagh ,
Volume 7, Issue 2 (6-2018)
Abstract
Aims: The first step in the purification of omega-3 is to extract oil. The aim of this study was to evaluate the effects of Wet Pressing (WP), Cold Extraction (CE), and Enzyme Extraction (EE) methods on tuna by-products oil and their moisture as well as chemical parameters.
Materials and Methods: The methods used in this experimental study to extract oil from primary raw materials were WP, CE, and EE and the efficiency rate of the methods was calculated. Regarding the qualitative evaluation, moisture content, volatile compounds, neutralized lipid levels, fatty acid profiles, acidity rates, and also levels of mercury, arsenic, cadmium, and lead were measured. Data analysis was performed by SPSS 22, using one way ANOVA and Duncan test.
Findings: The amount of oil extracted by EE method was significantly higher than the other two methods (p<0.05). The amount of oil moisture did not have a significant difference in 3 methods (p>0.05). Cholesterol levels in the samples of oils obtained from these methods were not significantly different. Free fatty acid profile in these treatments did not show significant difference. Acidity value in EE group was significantly higher than 2 other treatments. Also, the amount of toxic metals like Hg and As in oils obtained by EE method was significantly higher than that of WP and CE treatments. On the other hand, Pb level did not have a significant difference in the experimental groups.
Conclusion: Due to the quality of the obtained oil and the fact that EE method does not harm the environment, it can be a good method to extract fish oil.
Volume 8, Issue 29 (5-2011)
Abstract
At present, demands for inexpensive and alternative protein sources for animal protein, in order to be used in value–added foods have been increased. Therefore, many researchers shifting on production of plant protein resources. So, the objective of present study was possibility measurements of cottonseed protein concentrate production for human consumption from cottonseed meal. Three different methods, n-butanol : acid, mixed solvents (water : acetone : hexan) and ethanol-ultra filtration, in order to produce cottonseed protein concentrate were examined. Variables (percentage) were nitrogen, nitrogen solubility, fat, crude fiber, total gossypol and free gossypol. Statistical analysis was performed in the three distinct statistical patterns and by using blocks completely random and examination at significantly = α 0.01. After comparing resulted data with world standard measurements, results obtained as follow: extraction methods with n-butanol : acid (9 times washing along with Hcl), using mixed solvents (30 : 67 : 3 ratio along with classic extraction) and ethanol-ultra filtration (alkaline extraction along with ultra filtration molecular weight Cut off: 20000) were suitable. The last extraction method was demonstrated as most appropriate method to produce cottonseed protein concentrate.
Volume 21, Issue 148 (5-2024)
Abstract
Herbal bioactive compounds are secondary metabolites of plants that are produced in response to environmental stress and to protect the plant against harsh conditions. These compounds have both health effects on humans and also have preservative effects in food products. The conditions for extracting active compounds have a significant effect on their functional activities, and conventional and new methods have been used to extract bioactive compounds from plants. The aim of this study was to compare the extraction methods of bioactive compounds of Persian Golnar extract (PGE). In this research three methods of ohmic (temperatures of 45 °C and 60 °C for 40 and 60 min), ultrasonic (temperatures of 40 °C, 50 °C and 60 °C for 20 and 40 min) and perculation (for 24, 48 and 72 h) were used to prepare PGE, and the best extract was selected based on the extraction yield, total phenol content (TPC), total anthocyanin content (TAC) and antioxidant activity (DPPH radical scavenging). The results showed that there was no significant difference between the extraction yields of all three methods (p>0.05). The ohmic method had the same TPC as the ultrasonic method, but showed a higher TAC and antioxidant activity and was chosen as the best method. The optimal treatment in this stage included ohmic method, 60 °C and 40 min, and the extract obtained under these conditions contained 109.74 mg GAE/g of TPC, 373.26 mg/g of TAC and 81.11% antioxidant activity.
