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Pressurized Hot Water Extraction: Promising Green Extraction TechnologyBY: Bhushan Bibwe | Category: Agriculture | Submitted: 2017-04-12 01:20:58
Article Summary: "The article is about working principle, advantages, limitation and application of Pressurized hot water extraction technique. PHWE utilizes very cheap, abundantly available and non-toxic liquid, water as an extracting solvent which is environment friendly can be recycled or disposed off with certain treatments. In PHWE technique.."
Pressurized Hot Water Extraction: Promising Green Extraction Technology
Authors: Bibwe Bhushan, Manoj Kumar Mahawar, Kirti Jalgaonkar, Dukare Ajinath and Pankaj Kannaujia
Horticultural Crop Processing division, ICAR-CIPHET, Abohar
The effective sample preparation and extraction procedures are regarded as a vital step in the analysis of solid sample. Classical sample preparation techniques that rely on extraction with solvents are liquid–liquid extraction (LLE), sonication, soxhlet extraction etc. However, these traditional methods are error-prone, time consuming with low extraction efficiency and also require large volume of harmful organic solvents. With the amount of hazardous waste needing to be decreased worldwide, the focus today is on automated and environmentally friendly extraction techniques that utilise a minimal amount of organic solvent. Such type of extraction techniques includes, supercritical fluid extraction (SFE), microwave-assisted extraction (MAE), pressurized liquid extraction (PLE) and pressurized hot water extraction (PHWE).
Water is possibly the most abundantly and naturally available non-toxic liquid on the Earth necessary for life, so its possibility to be used as a solvent has almost negligible environmental impact considering its production, use, transportation and recycling. In order to reduce the usage of organic solvents, PHWE can be one of the feasible green solvent extraction methods as it utilizes pressurized water as extractant (extracting solvent) at elevated temperature and controlled high pressure conditions. PHWE extraction technique uses liquid water at temperatures well above the atmospheric boiling point (100°C), but below its critical point (374°C, 22.1 MPa). PHWE also called as superheated water extraction, subcritical water extraction or hot liquid extraction. Water has an extremely high relative static permittivity (dielectric constant, ε). It has been demonstrated by scientists that with increasing water temperature at enough pressure, the dielectric constant (ε) of water (80 at 25oC) decreases to 27 at 250 oC and 50 bar, which falls between those of methanol (ε = 33) and ethanol (ε = 24) at 25oC to maintain it in liquid state. The polarity of water can be varied close to those of alcohols and allows it to dissolve a wide range of medium and low polarity analytes. PHWE has steadily become an efficient and low cost method for extraction of bioactive, essential and nutritional compounds from plants and food materials. PHWE can also be used for removal of organic contaminants in food stuff and also to extract different classes of pesticides and herbicides from soil and sediment samples to allow for remediation. It is dynamic extraction method in which larger volume of fluid is continuously refreshed during the whole process of extraction and extraction efficiency is strongly depends on the temperature and flow rate.
Comparison of different extraction techniques:
Parameters affecting PHWE process:
About Author / Additional Info:
I am working as a scientist at ICAR-Central Institute of Post Harvest Engineering and Technology, Abohar (ISO 9001:2015 institute).
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