scholarly journals Influence of drying procedure on colour and rehydration characteristic of wild asparagus

2009 ◽  
Vol 27 (No. 3) ◽  
pp. 171-177 ◽  
Author(s):  
S. Jokić ◽  
I. Mujić ◽  
M. Martinov ◽  
D. Velić ◽  
M. Bilić ◽  
...  
Keyword(s):  
Colour Change ◽  
Convective Drying ◽  
Physical Factors ◽  
Microbial Count ◽  
Rehydration Ratio ◽  
Airflow Velocity ◽  
Freeze Dried ◽  
Drying Procedures ◽  
C 50

The objective of this research was to examine the influence of different drying procedures on the colour quality and rehydration capacity of wild asparagus (<i>Asparagus maritimus</i> L.). Wild asparagus samples were dried using convective (40°C, 50°C, 60°C, and 70°C at the airflow velocity of 2.75 m/s), natural, and freeze (–20°C and –40°C) drying procedures. Rehydration and colour characteristics were used as indicators of the quality of the dried asparagus samples. Convective drying of asparagus resulted in the smallest colour change of the fresh material, whereby drying at 60°C presented the optimum. The best rehydration ratio was achieved when the samples were freeze dried at –40°C. Naturally dried asparagus samples resulted in a very low rehydration ratio compared to the other procedures investigated. The rehydration and appearance of the dried asparagus are two important physical factors that need special attention when designing or selecting a drying procedure. Furthermore, the influence of drying on other quality characteristics of wild asparagus, such as the content of active ingredients or microbial count, should be investigated in further studies. The investigation of economic parameters of different drying procedures should be considered as well.

Effect of pectin coating on colour and quality of dehydrated pineapple during storage

2016 ◽  
Vol 35 (2) ◽  
Author(s):  
C. S. Saini ◽  
H. K. Sharma
Keyword(s):  
Colour Change ◽  
Quality Parameters ◽  
Colour Difference ◽  
Rehydration Ratio ◽  
Browning Index ◽  
Reaction Rate Constants ◽  
Evaluation Scores ◽  
Colour Parameters ◽  
Predicted Values

The effect of storage on the colour and quality parameters of uncoated and pectin coated dehydrated pineapple samples were studied during storage. The dehydrated pineapple samples were packed in aluminium foil pouches and stored at 30 ± 1°C and 75% RH. The colour change was determined using <italic>L*, a*, b*</italic>, hue, total colour difference and browning index values. The kinetics of changes in colour parameters was determined using zero-order and first-order reaction kinetics. Non-linear regression of experimental data was done to obtain the reaction rate constants. <italic>L*, b*</italic>, and hue values decreased, while <italic>a*</italic>, total colour difference and browning index increased during storage in both coated and uncoated samples. Both the models were found to describe the data of colour parameters adequately. The correlation coefficient value of most of the colour parameters was more than 0.95 indicating good agreement between experimental and model predicted values. The browning was more observed in uncoated samples than coated samples, which increased in the later stages of storage. Rehydration ratio decreased, while moisture content increased with storage. The sensory evaluation scores of coated samples remained acceptable for longer period than uncoated samples.

scholarly journals THE EFFECT OF CONVECTIVE FIXED BED DRYING BASED ON A SOLAR COLLECTOR AND PHOTOVOLTAIC (CSD) TO THE QUALITY ATRIBUTES OF RED PEPPER COMPARED WITH CONVENTIONAL CONVECTIVE FIXED BED DRYING (CCD)

2019 ◽  
Vol 7 (1) ◽  
pp. 24-33
Author(s):  
Siti Asmaniyah Mardiyani ◽  
Sumardi Hadi Sumarlan ◽  
Bambang Dwi Argo ◽  
Amin Setyo Leksono
Keyword(s):  
Ascorbic Acid ◽  
Solar Collector ◽  
Fixed Bed ◽  
Quality Attributes ◽  
Red Pepper ◽  
Convective Drying ◽  
Solar Drying ◽  
Rehydration Ratio ◽  
Drying System

The effect of conventional convective drying (CCD) and convective solar drying (CSD) based on a solar collector and photovoltaic on the quality of dried red pepper was researched. The study was aimed to determine the effect of five drying system (CCD 50°C, CCD 60°C, CCD 70°C, CSD, and open sun drying) on the quality attributes of dried red pepper. The quality observed were rehydration ratio, ascorbic acid, capsaicin, non-enzymatic browning index, anthocyanin, and carotenoids. The results of the study confirmed that the drying system significantly affected the quality attributes of dried red pepper except for anthocyanin.  The CSD had a satisfactory result, shown by some attributes  (carotenoids, ascorbic acid, and ratio) which were not statistically different from the quality of dried red pepper gained from CCD 50°C.

scholarly journals Physical quality analysis of drying beluntas leaves (Pluchea indica L.) using variations of drying methods

2021 ◽  
Vol 922 (1) ◽  
pp. 012053
Author(s):  
A S Telaumbanua ◽  
J N W Karyadi ◽  
Pravitajaty ◽  
A N I Kusumastuti ◽  
K Ma’Rufah ◽  
...  
Keyword(s):  
Moisture Content ◽  
Quality Analysis ◽  
Physical Parameters ◽  
Drying Methods ◽  
Rehydration Ratio ◽  
Freeze Dried ◽  
Drying Conditions ◽  
The Impact ◽  
Freeze Dryer

Abstract Beluntas leaves are medicinal plants with pharmacological effects, such as antioxidant, antidiarrheal, antidiabetic, and antibacterial. Drying is one of the processes before the beluntas leaves are consumed. However, drying could degrade the quality of beluntas leaves. This research aims to investigate the impact of drying conditions on the physical qualities of dried beluntas leaves. Beluntas leaves with a moisture content of 83-90% were dried using drying methods, namely the greenhouse effect dryer (ERK), cabinet dryer (CD) at 40, 50, 60, and 70°C, and freeze dryer (FD) at 35, 45, and 55°C. The physical parameters measured were moisture content, color, shrinkage, rehydration ratio, and bulk density. The results showed that the final moisture content of the dried beluntas leaves were 8.40; 4.92-10.70; 4.73-6.77%w.b for ERK, CD, and FD, respectively. Page’s model was suitable for explaining the changes in moisture ratio during the drying process (R 2 = 0.9934 − 0.9999). The freeze-drying method can preserve the leaves’ color and obtain the lowest moisture content with a low drying temperature compared to other methods. Freeze-dried beluntas leaves also exhibited the highest rehydration ratio, which was 2.03 – 2.25.

Study on the Effect of Vacuum Microwave Drying on Quality of Okra

2013 ◽  
Vol 791-793 ◽  
pp. 132-136 ◽  
Author(s):  
Jing Yi Li ◽  
Zhen Hua Duan
Keyword(s):  
Microwave Power ◽  
Fracture Resistance ◽  
Colour Change ◽  
Microwave Drying ◽  
Rehydration Ratio ◽  
Drying Time ◽  
Vacuum Degree ◽  
Vacuum Microwave ◽  
The Impact

The purpose of this paper is to investigate the impact of vacuum microwave drying on the quality of okra. The curves of colour, fracture resistance, rehydration ratio and the content of vitaminC were obtained at various drying times, vacuum degrees and microwave powers. Results showed that an increase in drying time and microwave power resulted in serious colour change when compare the dry product to fresh okra. However, the higher the vacuum, the slighter the colour changed. The fracture resistance decreased and the brittleness was good when drying time was increased to high level of 14min and 16min. Increasing vacuum degree also made fracture resistance decreased; rehydration ratio increased with the time and microwave power increased, but decreased if the time exceeds 14min. The rehydration ratio of okra is also affected by the vacuum degree, increasing which led the rehydration ratio increased significantly at the beginning of drying and then slowly; the greater the drying time and microwave power, the more lost of vitaminC, however, higher vacuum degree was found to be beneficial to save the vitaminC.

scholarly journals Comparative quality assessment of different drying procedures for plum fruits (Prunus domestica L.)

2017 ◽  
Vol 35 (No. 5) ◽  
pp. 449-455 ◽  
Author(s):  
Akhijahani Hadi Samimi ◽  
Arabhosseini Akbar ◽  
Kianmehr Mohammad Hossein
Keyword(s):  
Colour Change ◽  
Drying Methods ◽  
Prunus Domestica ◽  
Air Velocity ◽  
Rehydration Ratio ◽  
Hot Air Drying ◽  
Hot Air ◽  
Drying Procedures ◽  
Different Levels

Different drying methods for plum fruits were compared in this case study. Samples were dried at a temperature of 70°C using the method of hot air drying as well using hybrid solar drying at three levels of air velocity (0.5, 1, and 2 m/s) and open sun drying. The dried samples were then compared on the basis of changes in colour, shrinkage and rehydration. The effect of air velocity on colour change was significant (P &lt; 0.05) at the three different levels (0.5, 1, and 2 m/s), whereas effects on shrinkage and rehydration ratio were not significant (P &lt; 0.05). The best conditions for plum drying with respect to values of colour change, shrinkage, rehydration ratio and the drying costs were obtained for the plums dried using a hybrid solar dryer at an air velocity of 1 m/s.

scholarly journals Ultrasound-assisted osmotic dehydration and convective drying of apples: Process kinetics and quality issues

2016 ◽  
Vol 37 (3) ◽  
pp. 383-391 ◽  
Author(s):  
Dominik Mierzwa ◽  
Stefan J. Kowalski
Keyword(s):  
Osmotic Dehydration ◽  
Colour Change ◽  
Apple Fruit ◽  
Point Of View ◽  
Convective Drying ◽  
Drying Process ◽  
Drying Time ◽  
Ultrasound Enhancement ◽  
Kinetics Of

Abstract The aim of the present theme issue was to study the influence of ultrasound enhancement on the kinetics of osmotic dehydration and the effect of convective drying from the point of view of drying time and quality of dried products. Apple fruit was used as the experimental material. The kinetics of osmotic dehydration with (UAOD) and without (OD) ultrasound enhancement were examined for 40% fructose and sorbitol solutions. The effective dehydration time of osmotic process was determined. Preliminary dehydrated samples with OD and UAOD were next dried convectively with (CVUS) and without (CV) ultrasound assistance. The influence of OD and UAOD on the kinetics of CV and CVUS drying was analysed. The parameters of water activity and colour change were measured for the assessment of product quality after drying process.

An image analysis based expert system for assessing the quality of freeze-dried protein formulations

2012 ◽  
Author(s):  
Jukka Rantanen ◽  
Hjalte Trnka ◽  
Jian Wu ◽  
Marco van de Weert ◽  
Holger Grohganz
Keyword(s):  
Image Analysis ◽  
Expert System ◽  
Protein Formulations ◽  
Freeze Dried

ASPECTS OF THE ARCHITECTURAL AND URBAN HERITAGE: FROM REGISTERS TO CONSERVATION FOR ADAPTIVE AND MODERN USE AT THE HISTORIC CORES OF SALT AND IRBID, JORDAN

2017 ◽  
Vol 11 (2) ◽  
pp. 190
Author(s):  
Leen Adeeb Fakhoury ◽  
Naif Adel Haddad
Keyword(s):  
Local Community ◽  
Initial Assessment ◽  
Physical Factors ◽  
Cultural Significance ◽  
Community Quality Of Life ◽  
Urban Heritage ◽  
Two Cities ◽  
Conservation Actions ◽  
Historic Cities

This paper attempts to present and discuss the outcome of the results of the key different studies and projects carried out at Salt and at Irbid historic cores.  It focuses on the executed urban heritage projects undertaken mainly by the Ministry of Tourism and Antiquities (MoTA) of Jordan in the last two decades. It discusses their different aspects through initial assessment of the loss and degradation of the cultural heritage assets of the two cities; the fragmentation and lack of connectivity between the modern and historic cores; issues of sustainability of architectural and urban heritage projects i.e. tourism planning and conservation; and reuse projects at the historic cores in relation to cultural, physical factors and development needs. It also addresses the behaviour and characteristics of the urban regeneration process in those two historic cities, starting from their documentation to examination of the different aspects of the currently adopted urban practices and policies, and their impact on the existing urban heritage, depending on the specific identity of the respective historic cores. Finally, it aims to define the main constraints and challenges for the reuse of the existing heritage fabric including the local community quality of life, while building on sustainable heritage activities accommodating tourism opportunities. This will give, at least, some indications from which we can identify a use or combination of uses, and practical steps needed for successful heritage conservation actions in Jordan, in order to retain the cultural significance of the place.

scholarly journals mHealth for the Monitoring of Brace Compliance and Wellbeing in Adolescents with Idiopathic Scoliosis: Study Protocol for a Feasibility Study

2021 ◽  
Vol 18 (15) ◽  
pp. 7767
Author(s):  
Verónica Martínez-Borba ◽  
Carlos Suso-Ribera ◽  
Amanda Díaz-García ◽  
Judith Salat-Batlle ◽  
Diana Castilla ◽  
...  
Keyword(s):  
Idiopathic Scoliosis ◽  
Feasibility Study ◽  
Mobile Applications ◽  
Clinical Utility ◽  
Physical Factors ◽  
Perceived Health Status ◽  
Clinical Alarms ◽  
Patient Responses ◽  
Physical Consequences

Attempts to optimize monitoring of brace adherence prescribed to adolescents with idiopathic scoliosis (IS) have generally relied on sensors. Sensors, however, are intrusive and do not allow the assessment of psychological and physical consequences of brace use that might underlie poor adherence. Mobile applications have emerged as alternatives to monitor brace compliance. However, the feasibility and utility of these app-based systems to assess key psychological and physical domains associated with non-adherence remain unexplored. This feasibility study aims to test the usability, acceptability, and clinical utility of an app-based system that monitors brace use and related psychological and physical factors. Forty adolescents with IS daily respond to the app for 90 days. The patient responses may generate clinical alarms (e.g., brace non-adherence, discomfort, or distress) that will be sent daily to the medical team. Primary outcomes will be app usability, acceptability, and response rates. Secondary outcomes will include brace adherence, the number of side effects reported, number and type of clinical alarms, stress, quality of life, perceived health status, and mood. If accepted by patients and clinicians, apps may allow rapid detection and response to undesired events in adolescents undergoing brace treatment.

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