'Extraction time' diaporamas de présentation

Solvent Cycle, Methods for Solute Precipitation

Chapter 7. Solvent Cycle, Methods for Solute Precipitation. Heat and Mass Transfer: High Pressure chemical Engineering I (WS). Flow Scheme of a Solvent Cycle. Solvent Cycle. Solvent Cycle Steps: separate the extract from the solvent (1), clean the solvent for reuse (2),

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LYCOPENE EXTRACTION FROM TOMATOES

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Extraction efficiency and extraction times of the SHIPTRAP gas stopping cell

Extraction efficiency and extraction times of the SHIPTRAP gas stopping cell. Gleb Vorobjev for SHIPTRAP collaboration, GSI. SMI, 27 . March 200 6. Outline. Introduction: Off-line experimental set-up Investigation of the gas cell: Summary. SHIPTRAP set-up SHIPTRAP gas stopping cell.

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Ultrasonic-assisted extraction of flavonoids from panax notoginseng flowers and its antimicrobial activities

Ultrasonic-assisted extraction of flavonoids from Panax notoginseng flowers (PNF) and its antimicrobial activities were first investigated. Single-factor and orthogonal experiment were used to investigate the optimum extraction condition. The results showed that, the combination of 90% ethanol, material-to-liquid ratio of 1:20 (g/mL), 1 h ultrasonic extraction and 3 times of extraction were optimal extraction condition with the highest yields of flavonoids from PNF at 40 kHz/200 W. Under the optimal extraction condition, the extraction rate was 2.49%. Also, flavonoids from PNF had obvious inhibitory effects on Staphylococcus aureus, Aeromonas hydrophila and Pseudomonas aeruginosa. These results clearly indicate that flavonoids from PNF have the potential to be antimicrobial agents, and also provide the theoretical data for supporting the use of PNF for food, pharmaceutical, cosmetics or nutraceutical industries.

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Optimization of ultrasonic extraction of alkaloids from Scutellaria barbata D. Don using response surface methodology

Based on a Box- Behnken design，response surface methodology was used to optimize the effects of processing parameters of extraction from Scutellaria barbata on total alkaloids yield. Three independent variables such as extraction time (X1), liquid-solid ratio (X2) and ultrasonic frequency (X3) were study. The P-value indicated that both extraction time (X1) and ultrasonic frequency (X3) had significant effects on the response value, followed by the interaction effects of liquid-solid ratio and ultrasonic frequency (X2X3). It also indicated that the square effects of extraction time (X1 2 ), liquid-solid ratio ( X2 2 ) and ultrasonic frequency (X3 2 ) had significant effects on the yields of alkaloids from Scutellaria barbata D. Don. The optimum conditions of alkaloids extraction were extraction time of 60 min, liquid-solid ratio of 55 mL/g and ultrasonic frequency of 350w. Under optimized conditions, the experimental yield 1.39±0.061% agreed closely with the predicted yield (1.40%).

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