Comparison of pressurised fluid extraction and microwave assisted extraction with atmospheric pressure methods for extraction of additives from polypropylene

The Analyst ◽  
1999 ◽  
Vol 124 (3) ◽  
pp. 397-400 ◽  
Author(s):  
Harold J. Vandenburg ◽  
Anthony A. Clifford ◽  
Keith D. Bartle ◽  
John Carroll ◽  
Ian D. Newton
Keyword(s):  
Atmospheric Pressure ◽  
Microwave Assisted Extraction ◽  
Fluid Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction

scholarly journals Microwave-Assisted Extraction as an Alternative to Soxhlet, Sonication, and Supercritical Fluid Extraction

1996 ◽  
Vol 79 (1) ◽  
pp. 142-156 ◽  
Author(s):  
Viorica Lopez-A Vila ◽  
Richard Young ◽  
Nataly Teplitsky
Keyword(s):  
Supercritical Fluid Extraction ◽  
Supercritical Fluid ◽  
Soxhlet Extraction ◽  
Standard Reference Materials ◽  
Microwave Assisted Extraction ◽  
Fluid Extraction ◽  
Microwave Assisted ◽  
Spiked Soil ◽  
Assisted Extraction ◽  
Relative Standard

Abstract Microwave-assisted extraction (MAE), Soxhlet, soni cation, and supercritical fluid extraction (SFE) were compared in their ability to extract 95 compounds listed in U.S. Environmental Protection Agency Method 8250. Freshly spiked soil samples and 2 standard reference materials were extracted with hexane-acetone (1 + 1) by MAE and Soxhlet extraction, with methylene chloride-acetone (1 + 1) by sonication extraction, and with supercritical carbondioxide modified with 10% methanol by SFE. Results indicate that MAE is a promising extraction technique. Of 94 compounds for which we are reporting data, 51 compounds gave MAE recoveries of >80%; 33,50-79%; 8,20-49%; and 2, <19%. Soxhlet extraction gave very similar results: 50 recoveries were >80%; 32,50-79%; 8,20-49%; and 4, <19%. Sonica tion recoveries were slightly higher: 63 values were >80%; 25,50-79%; 4,20-49%; and 2, <19%. SFE recoveries were the lowest: 37 values were >80%; 37, 50-79%; 12,20-49%, and 8, <19%. MAE gave the best precision: relative standard deviations (RSDs) were <10% for 90 of 94 compounds. Soxhlet extraction gave the worst precision: only 52 of 94 samples gave RSDs ≤10%. Although MAE looks promising, 15 polar basic compounds extracted at 115°C with hexane acetone for 10 min (1000 W power) gave poor recoveries. Because no technique gave acceptable recoveries for these polar compounds, we investigated their extraction with MAE using acetonitrile at 50° and 115°C. Ten of the 15 compounds were quantitatively recovered (>70%) with acetonitrile at 115°C.

Study on Extraction Technology of the Pigment from Spinach

2012 ◽  
Vol 518-523 ◽  
pp. 3931-3937 ◽  
Author(s):  
Zhi Ling Chen ◽  
Jian Ping Chao ◽  
Bing Kun Wang ◽  
Hui Lin Cao ◽  
Song Wang ◽  
...  
Keyword(s):  
High Efficiency ◽  
Optimum Process ◽  
Process Conditions ◽  
Extraction Temperature ◽  
Microwave Assisted Extraction ◽  
Fluid Extraction ◽  
Extraction Technology ◽  
Isolation Technique ◽  
Microwave Assisted ◽  
Assisted Extraction

spinach contains a variety of plant pigments, high lutein content, which makes the research of spinach pigment extracting research special significance. Supercritical CO2fluid extraction food industry is a new extraction and isolation technique; microwave assisted extraction technology has the potential to become future food industrialization production of the leading. The UV-vis spectrophotometric analysis, parallel experimental method to determine the optimum process conditions of extracting pigment from spinach. For supercritical CO2extraction: ethanol (as extractant) is 250ml, extraction pressure 30MPa, extraction temperature 50°C, extraction time 1.5h. The microwave assisted extraction of ethanol as extractant, liquid ratio is 1:20, extraction time1.5h, extraction temperature of 40 °C. The comparison of two methods: microwave extraction is energy saving and high efficiency, and supercritical fluid extraction has safety and environmental protection, therefore, the two methods are worth to advocate and promote.

scholarly journals COMPARISON OF THE QUALITATIVE COMPOSITION OF LAURUS NOBILIS LEAVES EXTRACTS OBTAINED BY SUPERCRITICAL FLUID EXTRACTION AND MICROWAVE-ASSISTED EXTRACTION

2018 ◽  
pp. 169-177 ◽  
Author(s):  
Денис (Denis) Игоревич (Igorevich) Прокопчук (Prokopchuk) ◽  
Олег (Oleg) Игоревич (Igorevich) Покровский (Pokrovskiy) ◽  
Ольга (Ol'ga) Олеговна (Olegovna) Паренаго (Parenago) ◽  
Саида (Saida) Амирановна (Аmiranovna) Багателия (Bagatelia) ◽  
Алхас (Аlkhas) Анатольевич (Аnatol'evich) Марколия (Markolia) ◽  
...  
Keyword(s):  
Supercritical Fluid Extraction ◽  
Supercritical Fluid ◽  
Process Parameters ◽  
Biologically Active ◽  
Qualitative Composition ◽  
Microwave Assisted Extraction ◽  
Fluid Extraction ◽  
Laurus Nobilis ◽  
Microwave Assisted ◽  
Assisted Extraction

Along with traditional methods for processing aroma plants, such as steam distillation or extraction with organic solvents, novel alternative approaches are developed which provide the means for a more effective isolation of biologically active compounds from plant matrices and simultaneously possess ecological attractiveness. Supercritical fluid extraction and microwave-assisted extraction can be attributed to such approaches. Their implementation into routine practice is partially hampered by somewhat vague understanding of applicability areas of these methods as well as by the lack of knowledge on the influence of process parameters on the result. In this work, we performed a comparison of the applicability of supercritical fluid and microwave-assisted extraction techniques for the isolation of biologically active compounds from leaves of Laurus nobilis L. It was shown that microwave-assisted extraction allows obtaining oil containing only volatile terpene components. Supercritical fluid extraction allows isolation of not only volatile terpenes from laurel leaves, but a broader spectrum of compounds including eugenol derivatives, phytosteroids and tocopherols. Qualitative composition of supercritical fluid extracts is virtually independent on process parameters, only quantitative differences in component proportions are registered.

Sign in / Sign up

Export Citation Format

Share Document