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Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia02:10

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Alkynes can be reduced to trans-alkenes using sodium or lithium in liquid ammonia. The reaction, known as dissolving metal reduction, proceeds with an anti addition of hydrogen across the carbon–carbon triple bond to form the trans product. Since ammonia exists as a gas (bp = −33°C) at room temperature, the reaction is carried out at low temperatures using a mixture of dry ice (sublimes at −78°C) and acetone. 
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Liddle syndrome is a genetically inherited form of hypertension characterized by the overactivity of epithelial sodium channels in the nephron, the functional unit of the kidney. This heightened activity leads to increased sodium reabsorption and excessive excretion of potassium. To counteract this, potassium-sparing diuretics such as amiloride are used. They function by blocking these sodium channels, thereby reducing the influx of sodium into the epithelial cells and minimizing the loss of...
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Diuretics are antihypertensive drugs used to treat hypertension resulting from sodium and water retention. Sodium, vital for fluid balance and nerve or muscle function, is regulated by the kidneys through millions of nephrons. Blood enters nephrons via afferent arterioles, which branch into capillaries called glomeruli. These filter blood plasma, allowing water and solutes, like sodium ions, to pass through capillary walls into Bowman's capsule. The filtrate then flows through various...
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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Phase I biotransformation reductive reactions are chemical processes that modify drugs by introducing or revealing polar functional groups via reduction. Enzymes called reductases catalyze these reactions, playing a pivotal role in drug metabolism by transforming lipophilic drugs into more polar, water-soluble metabolites for easy excretion. An essential type of reductive reaction is the carbonyl group reduction, where aldehydes and ketones are reduced to alcohols. An example is the...
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In a precipitation reaction, aqueous solutions of soluble salts react to give an insoluble ionic compound – the precipitate. The reaction occurs when oppositely charged ions in solution overcome their attraction for water and bind to each other, forming a precipitate that separates out from the solution. Since such reactions involve the exchange of ions between ionic compounds in aqueous solution, they are also referred to as double displacement, double replacement, exchange reactions, or...
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Product Structuring for Sodium Reduction.

Aaron S M Goh1

  • 1Singapore Institute of Technology.

Journal of Nutritional Science and Vitaminology
|November 25, 2015
PubMed
Summary

Reducing salt in food is key for health. Product structuring methods aim to enhance saltiness without increasing sodium content, improving flavor perception.

Area of Science:

  • Food Science
  • Sensory Science
  • Nutrition

Background:

  • Salt enhances food flavor but high intake links to cardiovascular diseases.
  • Reducing dietary salt is a public health priority.
  • Product structuring offers innovative approaches to salt reduction.

Purpose of the Study:

  • To review methods for reducing salt in food products.
  • To explore how product structuring impacts salt release and perception.
  • To highlight strategies for maintaining flavor while lowering sodium.

Main Methods:

  • Review of scientific literature on food product structuring.
  • Analysis of methods influencing salt release from food matrices.
  • Examination of salt transport mechanisms to taste receptors.

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Main Results:

  • Product structuring can optimize salt delivery to taste buds.
  • Methods focus on enhancing saltiness perception without added salt.
  • Understanding food matrix interactions is crucial for salt reduction.

Conclusions:

  • Product structuring presents viable strategies for salt reduction in foods.
  • These techniques aim to improve taste experiences with lower sodium levels.
  • Further research into food structure and salt perception is warranted.