Improving Grape Quality Using Microwave Vacuum Drying Associated with Temperature Control

Improving grape quality using microwave vacuum drying associated with temperature control.

Microwave (MW) vacuum dehydration using temperature to control the level of MW power demonstrated potential in improving the performance of the process. Product surface temperature measured by an infrared temperature sensor was used to control MW power at any level between 0 and 3 kW. Multiple linear regression analysis indicated an r2 = 0.942 for prediction of final moisture content and r2 = 0...

Microwave Assisted Vacuum Drying and Endpoint Determination Using Mass Spectrometry

Microwave drying technology has the potential for large production time and energy cost savings versus traditional vacuum drying methods for active pharmaceutical ingredient (API) applications. One of the most critical parameters in the drying process is the determination of the end point, usually at a specified moisture content. On-line mass spectrometry (MS) was used as a tool to monitor micr...

Control of Continuous Microwave Drying Process of Peanuts Using Remote Temperature Measurement

Process control methods are widely used in food industry for quality assurance purposes. The characteristics and requirements for various food processing operations are described by Mittal (1996) and McFarlane (1995). For peanut processing, a complex fuzzy control system for the roasting process, based in part on theoretical modeling (Landman et al., 1994) was developed by Davidson et al. (1999...

Pulsed Vacuum Osmotic Dehydration of Garlic Bulbs Followed by Microwave Drying

ABSTRACT: The combination of pulsed vacuum osmotic dehydration and microwave drying of garlic bulbs were examined. The response surface methodology (RSM) was used to determine the effect of NaCl concentration (8%-20%), osmotic solution temperature (25-65°C), operation pressure (240-830 mbar), immersion time (20-300 min) and microwave power level (100-600 W) on water loss (WL), solids gain (SG),...

Low temperature vacuum drying – gentle on bacteria and the environment