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Lipid Absorption01:24

Lipid Absorption

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Dietary triglycerides from chyme in the duodenum are mixed with bile salts produced by the liver to emulsify fats. As a result, large droplets are broken down into smaller ones, increasing the surface area for enzymatic action. Once emulsified, pancreatic lipases hydrolyze the triglycerides into free fatty acids and monoglycerides.
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Methods for Studying Drug Absorption: In situ01:09

Methods for Studying Drug Absorption: In situ

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In situ experiments, such as the Doluisio method and Single-Pass Perfusion technique, provide critical insights into drug uptake by simulating in vivo conditions for drug absorption.
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Methods for Studying Drug Absorption: In vitro01:16

Methods for Studying Drug Absorption: In vitro

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In vitro experiments are crucial for understanding the transport and absorption of drugs through biological materials. These studies employ varied methods such as the diffusion cell method, the everted sac technique, and the everted ring technique.
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Mineral, Vitamin and Water Absorption01:27

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Electrolytes are essential minerals and ions primarily obtained from the diet and absorbed through the gastrointestinal tract. Most electrolytes are absorbed in the small intestine. While the absorption of iron and calcium primarily occurs in the duodenum, calcium is also absorbed in the jejunum and ileum. In these regions, passive diffusion contributes to its absorption alongside active transport mechanisms in the duodenum. These ions can exit the enterocytes through specialized active...
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Factors Influencing Drug Absorption: Anatomical Parameters01:23

Factors Influencing Drug Absorption: Anatomical Parameters

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Drug absorption involves the movement of drugs from the point of administration into the systemic circulation. Initially, Gastrointestinal (GI) motility propels the drug through the digestive tract and into the stomach. However, the stomach's high acidity and limited surface area restrict its role in drug absorption for most drugs. The drug then moves from the stomach to the small intestine via gastric emptying, which can be slowed by various factors, including interactions with other...
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Drug Absorption Mechanism: Passive Membrane Transport01:23

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Passive transport is a method of drug absorption where small, lipid-soluble drugs can move across the cell membrane. This movement happens along the concentration gradient, which is a natural flow from higher to lower concentration areas. The speed at which the drug moves is directly related to its lipid–water partition coefficient. This means that the more a drug dissolves in lipids, the faster it diffuses or spreads throughout the body. It is important to note that most drugs are either...
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Liposomal Mineral Absorption: A Randomized Crossover Trial.

Grant M Tinsley1, Patrick S Harty1, Matthew T Stratton1

  • 1Energy Balance & Body Composition Laboratory, Department of Kinesiology & Sport Management, Texas Tech University, Lubbock, TX 79409, USA.

Nutrients
|August 26, 2022
PubMed
Summary

A novel liposomal delivery mechanism significantly enhances iron absorption from multivitamin/mineral (MVM) supplements. This study found improved iron bioavailability with liposomal MVM compared to standard MVM, but no difference for magnesium absorption.

Keywords:
absorptionbioavailabilityironliposomesmagnesiummicronutrientsmultivitamin

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Area of Science:

  • Nutrition Science
  • Pharmacokinetics
  • Dietary Supplements

Background:

  • Multivitamin/mineral (MVM) supplements are widely used.
  • Optimizing mineral absorption from MVMs is crucial for efficacy.
  • Novel delivery systems may improve nutrient bioavailability.

Purpose of the Study:

  • To evaluate if a liposomal delivery mechanism enhances mineral absorption from an MVM.
  • To compare the absorption of iron and magnesium from liposomal versus standard MVM formulations.

Main Methods:

  • A randomized crossover trial involving 25 healthy participants.
  • Blood samples were collected at baseline and 2, 4, 6 hours post-ingestion of liposomal or standard MVM.
  • Serum iron and magnesium concentrations were analyzed using colorimetric assays and pharmacokinetic modeling.

Main Results:

  • Liposomal MVM significantly increased iron absorption compared to standard MVM, evidenced by higher concentrations at 4 and 6 hours and a greater area under the curve.
  • No significant differences in magnesium absorption were observed between the liposomal and standard MVM formulations.
  • Statistical analysis revealed significant condition × time interactions for iron absorption parameters (p < 0.02).

Conclusions:

  • A liposomal delivery mechanism effectively enhances iron absorption from MVM supplements.
  • Liposomal technology shows promise for improving the bioavailability of specific minerals in MVMs.
  • Further research may explore this delivery system for other essential nutrients.