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Related Concept Videos

Parentral Nutrition: Centeral and Peripheral Parental Nutrition01:27

Parentral Nutrition: Centeral and Peripheral Parental Nutrition

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Parenteral Nutrition (PN) delivers essential nutrients directly into the bloodstream, bypassing the digestive system. It is commonly used for individuals with severe digestive disorders or conditions that prevent normal nutrient absorption.
PN can be administered through two primary routes:
1. Central Parenteral Nutrition (CPN):
CPN involves delivering a high concentration of nutrients through a large vein. This is typically achieved using a Peripherally Inserted Central Catheter (PICC) or,...
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Amino Acid Catabolism01:18

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Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...
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Enteral Nutrition II: Nasointestinal and Gastrostomy Feeding01:15

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Enteral nutrition encompasses various methods of delivering nutrition directly to the gastrointestinal (GI) tract, bypassing traditional oral intake. It is particularly beneficial for patients who cannot eat by mouth but have a functioning digestive system. Key methods include nasointestinal feeding, gastrostomy, and jejunostomy, each suited to different clinical scenarios based on the patient's needs and condition.
Nasointestinal Feeding
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Protein Absorption01:12

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Proteins in the gastrointestinal tract typically come from food, but they can also originate from disintegrated cells or secreted enzymes. In the stomach, the enzyme pepsin breaks down these proteins into polypeptides. The fragments then move into the duodenum as a semi-fluid mass called chyme. Pancreatic proteases, such as trypsin and chymotrypsin, and intestinal brush border enzymes like carboxypeptidases further dismantle the polypeptides into tripeptides, dipeptides, and free amino acids.
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Amino Acid Biosynthetic Pathways01:29

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Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which...
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Amino acids03:42

Amino acids

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Amino acids are the monomers that comprise proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, or the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom. Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. There are 20 common amino acids present in proteins, each with a different R group. Variation in the amino acid sequence is responsible for...
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Updated: Mar 6, 2026

A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition
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Parenteral Nutrition: Amino Acids.

Leonard John Hoffer1

  • 1Faculty of Medicine, McGill University, Montreal, QC H3G 1Y5, Canada. l.hoffer@mcgill.ca.

Nutrients
|March 14, 2017
PubMed
Summary

Parenteral amino acids offer a targeted protein source for critically ill patients, balancing high protein delivery with controlled energy intake. This approach supports protein-catabolic states, contrasting with whole protein nutrition.

Area of Science:

  • Critical care medicine
  • Nutritional biochemistry
  • Clinical nutrition

Background:

  • Growing interest in optimizing protein delivery for protein-catabolic critically ill patients.
  • Need for nutrition therapies that provide ample protein without excessive energy.
  • Critical illness often leads to a hypermetabolic state with increased protein breakdown.

Purpose of the Study:

  • To summarize the principles of parenteral amino acid therapy.
  • To explain the formulation of parenteral amino acid solutions.
  • To compare parenteral amino acids with enteral whole protein products for critically ill patients.

Main Methods:

  • Review of biochemical and nutritional principles guiding parenteral amino acid therapy.
  • Explanation of parenteral amino acid solution formulation.
Keywords:
amino acidscritical illnessnutritional supportparenteral nutritionprotein nutrition

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  • Comparative analysis of parenteral amino acid products versus enteral whole protein products.

    • Main Results:

    • Parenteral amino acids can provide a generous protein supply while controlling energy input.
    • Understanding formulation is key to effective parenteral amino acid therapy.
    • Parenteral amino acids present distinct advantages and disadvantages compared to enteral nutrition in critical illness.

    Conclusions:

    • Parenteral amino acid therapy is a viable strategy for protein-catabolic critically ill patients.
    • Tailored formulation of parenteral amino acids is crucial for therapeutic success.
    • The choice between parenteral amino acids and enteral nutrition depends on individual patient needs and clinical context.