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Related Concept Videos

Dehydration Synthesis01:15

Dehydration Synthesis

Overview
Dehydration synthesis (also called a condensation reaction) is the chemical process in which two molecules covalently link together to form a new molecule, along with the release of a water molecule. Many physiologically important compounds form by dehydration synthesis reactions, such as complex carbohydrates, proteins, DNA, and RNA.
Synthesis of carbohydrates
Sugar molecules are covalently linked together by dehydration synthesis. During the reaction, the hydroxyl (-OH) group from...
Diabetes Insipidus I: Introduction01:29

Diabetes Insipidus I: Introduction

Definition Diabetes insipidus is a disorder marked by the production of large amounts of dilute urine because of impaired vasopressin production, release, or kidney response. The lack of effective vasopressin action limits water reabsorption in the renal collecting ducts, which leads to excessive urinary water loss and intense thirst.Clinical PresentationIndividuals with diabetes insipidus report persistent thirst and very high urine output. In severe cases, fluid intake can reach up to 20...
Regulation of Water Intake01:25

Regulation of Water Intake

Osmolality refers to the number of solute particles per kilogram of solvent in a solution. Plasma osmolality specifically indicates the total number of solute particles per kilogram of water in blood plasma. This value reflects the body's hydration status and is tightly regulated through mechanisms controlling water intake and output. While water consumption is a conscious decision, the body has intrinsic regulatory systems to maintain fluid balance. Dehydration, a state of water deficit...
Diabetes Insipidus II: Pathophysiology01:22

Diabetes Insipidus II: Pathophysiology

Normally, water balance is maintained through three interconnected mechanisms: the hypothalamic thirst center, the synthesis and release of antidiuretic hormone (ADH, or vasopressin), and the kidneys' responsiveness to this hormone. ADH is synthesized in the hypothalamus, released from the posterior pituitary, and acts on the distal nephron, allowing water reabsorption and concentrated urine production.Diabetes Insipidus and Its TypesIn diabetes insipidus (DI), this regulatory system is...
Dehydration of Aldols to Enones: Acid-Catalyzed Aldol Condensation00:43

Dehydration of Aldols to Enones: Acid-Catalyzed Aldol Condensation

As shown in Figure 1, under acidic conditions, the β-hydroxy ketone undergoes dehydration via an E1 elimination reaction to form an enone.
Physiology of the Genitourinary System III: Urine Concentration and Dilution01:20

Physiology of the Genitourinary System III: Urine Concentration and Dilution

The kidneys concentrate or dilute urine to maintain water and electrolyte balance. Nephrons, particularly the loop of Henle, play a crucial role in this process through the countercurrent multiplication system. This system establishes a high osmolarity in the renal medulla, which is essential for water reabsorption. In the loop of Henle’s descending limb, water is reabsorbed into the surrounding medulla due to its permeability to water. In contrast, the ascending limb actively transports...

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Rearing Axenic Delia antiqua with Half-Fermented Sterile Diets
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Onion dehydration: a review.

Jayeeta Mitra1, S L Shrivastava, P S Rao

  • 1Department of Agricultural and Food Engineering, Indian Institute of Technology, Kharagpur, 721302 India.

Journal of Food Science and Technology
|June 5, 2013
PubMed
Summary
This summary is machine-generated.

This review covers various onion dehydration methods, including air, solar, and vacuum drying. It highlights their role in preserving onion quality and adding value for consumers.

Keywords:
DehydrationMathematical modelingNutritional valueOnion

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Area of Science:

  • Agricultural Science
  • Food Science
  • Chemical Engineering

Background:

  • Onion (Allium cepa) is a globally significant vegetable crop, ranking third in world production.
  • Beyond culinary uses, onions possess notable medicinal properties.
  • Effective processing and preservation of onions are critical for maximizing their utility and shelf-life.

Purpose of the Study:

  • To review and compile various dehydration techniques for onions.
  • To assess the application of these methods for onion preservation and value addition.
  • To briefly summarize research on modeling onion drying kinetics and quality parameters.

Main Methods:

  • Convective air drying
  • Solar drying
  • Fluidized bed drying
  • Vacuum microwave drying
  • Infrared drying
  • Osmotic drying

Main Results:

  • A comprehensive overview of diverse onion dehydration technologies is presented.
  • The reviewed techniques are primarily employed for preservation and enhancing the value of onions.
  • Existing research on the modeling of drying kinetics and quality attributes is briefly compiled.

Conclusions:

  • Dehydration is a key strategy for onion preservation and value addition.
  • A variety of drying techniques are available, each with specific applications.
  • Further research into modeling drying kinetics and quality parameters is essential for process optimization.