Ultrasound dehydration of cashew apple followed by BL respectively showed the faster drying time compared to UN Ultrasound treatment was effective in retaining on whiteness of dried cashew apple The color difference of US followed by BL was significantly lower (p0 05) compared to UN samples The application of ultrasound during pretreatment (55 5 W/L 40 kHz) or during convective drying (31 kW m−3 21 8 kHz) was also addressed The results showed that the application of ultrasound during the pretreatment and during drying increased water transport and reduced the drying time

Structural changes caused by ultrasound pretreatment

2018-11-16Furthermore the drying process was accelerated by ultrasound demonstrating the reduction of the internal resistance to water transfer Finally it was observed that high structural changes on the potato cylinders can bring some disadvantages

Ultrasound technology is based on mechanical waves at a frequency above the threshold of human hearing ( 20 kHz) (Chandrapala et al 2013) Ultrasonic pretreatment involves the immersion of the material in water a hypertonic aqueous solution or other solutions to which ultrasound is applied (Fan et al 2008) Sonication in liquid produces

2018-10-20Pretreatment of biomass to maximize the recovery of fermentable sugars as well as to minimize the amount of enzyme inhibitors formed during the pretreatment is a challenge in biofuel process We develop a modified Fenton pretreatment in a mixed solvent (water/DMSO) to combine the advantages of organosolv and Fenton pretreatments The hemicellulose and cellulose in corncob

In this study ultrasound‐assisted osmotic dehydration (UAOD) pretreatment in combination with different drying methods (hot‐air vacuum and freeze‐drying) has been applied in order to achieve better quality of dried pumpkin slices UAOD pretreatments were carried out in sucrose solutions of 40 and 60% for 40 80 and 120 min

Honeyberries are rich in various nutrients (eg minerals and vitamins) and bioactive compounds (eg polyphenols) The aim of the study was to evaluate the impact of ultrasound (USN) pre-treatment ( power at 37 kHz) at 40 C for 3 min and drying techniques (conduction or vacuum) on nutritional c

Influence of Drying by Convective Air Dryer or Power

2010-9-15Convective air drying and power ultrasound effects on vitamin C and β-carotene contents in carrots were studied For convective air drying a central composite face-centered design fitting temperature between 40 and 65 C and air flow rate between 2 and 6 10−1 m/s were used previously carrots were blanched Likewise ultrasound drying was performed on both unblanched and blanched

2020-7-28pretreatment in drying of foods (Huang et al 2019) Ultrasound pretreatment accelerates the mass transfer in drying mainly due to breakdown of cells and formation of micro channels (Sun 2014) In the last decade ultrasound has been applied as a pretreatment in hot air drying

Barley grass is a plant resource for rehabilitation therapy Its processing requires retaining nutrition well for rehabilitation cure of consumers To meet the aim as well as low energy consumption and microbiological safety of products ultrasonic treatments (UT) were applied to bathing materials at different power levels (10 30 45 60W/L) for 10mins After treatments the bathed barley

Drying is a technique that involves removal of moisture using heat energy This heat affects the protein components in foods especially the thiosulphide groups which causes hydrophobic bond break that has been attributed greatly to denaturation during drying Safe moisture content (SMC) is the extent to which moisture can be withdrawn from food crops during drying that such crops can be

Figure 1 shows that the drying time of the specimens pretreated by ultrasound was much shorter than that of the control specimens It is also observed that the drying time was decreased with increase in the pretreatment time and in the ultrasound frequency On average the drying time for specimens pretreated with 28 kHz ultrasound was 22 20 16 and 15 h respectively for pretreatment time

2018-10-20Pretreatment of biomass to maximize the recovery of fermentable sugars as well as to minimize the amount of enzyme inhibitors formed during the pretreatment is a challenge in biofuel process We develop a modified Fenton pretreatment in a mixed solvent (water/DMSO) to combine the advantages of organosolv and Fenton pretreatments The hemicellulose and cellulose in corncob

Furthermore the drying process was accelerated by ultrasound demonstrating the reduction of the internal resistance to water transfer Finally it was observed that high structural changes on the potato cylinders can bring some disadvantages such as changes on the color and severe shrinkage

2020-7-5Abstract Dimensional stability is a key property of wood that significantly affects its applications The effect of an ultrasound pretreatment on poplar wood (Populous tomentosa) dimensional stability was examined During the pretreatments wood samples were immersed in distilled water and treated ultrasonically under three different powers and frequencies

Research Article Effect of Ethyl Oleate Pretreatment on

2019-7-31e drying time of pre-treated plums using chemical pretreatment was observed to be signi cantly shorter than that of untreated samples of plums [ ] It was found that chemical pretreat-ment could signi cantly accelerate the drying process and remarkably improve the quality of red peppers undergoing greenhouse and open sun drying [ ] e

In this study carrot slices were put in glucose osmotic 50% at 1 2 and 3 hr Ultrasound waves frequency 40 kH power 30 w/l passed through container of osmotic solution and carrot slices The results revealed that significant increasing of dry matter of sample by using ultrasound waves pre osmotic time had a significant on dry material by increasing from 1to 3 hr sample treated by

A pretreatment step is needed to enhance the enzymatic step In this study sugarcane bagasse (SCB) one of the most abundant agricultural residues in Thailand was pretreated biologically with various microorganisms of white-rot fungus—Phanerochaete sordid (SK 7) Cellulomonas sp (TISTR 784) and strain A 002 (Bacillus subtilis isolated

Evaluation of ultrasound pretreatment and drying methods on selected quality attributes of bitter melon (Momordica charantia L ) Recently numerous attentions have been drawn to bitter melon (Momordica charantia L ) processing due to its outstanding pharmacological properties

2019-7-31e drying time of pre-treated plums using chemical pretreatment was observed to be signi cantly shorter than that of untreated samples of plums [ ] It was found that chemical pretreat-ment could signi cantly accelerate the drying process and remarkably improve the quality of red peppers undergoing greenhouse and open sun drying [ ] e

Acoustic waves are characterized by their frequency (cycles per second) wavelength (distance between cycles) and amplitude (height of the wave) Depending on the frequency of the waveform sound waves can be classified as infrasonic sonic and ultrasonic Sonic waves have frequencies between 20 and 20 000 Hz which correspond to the frequency range of human hearing

Thus after pretreatment with the appropriate amount of 5% CO 2 during sample drying the relative percentage and number of esters contributing to the aroma of samples increased significantly compared with those of the control sample The main increase in content and number of types identified was observed for the ethyl ester compounds

2019-4-9(2019) Evaluation of ultrasound pretreatment and drying methods on selected quality attributes of bitter melon (Momordica charantia L ) Drying Technology: Vol 37 Special issue dedicated to selected papers from ADC 2017 pp 387-396