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Ascorbic acid in intestinal tissues

B A Oelrichs, C C Kratzing

    The Australian Journal of Experimental Biology and Medical Science
    |October 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Ascorbic acid (vitamin C) is easily lost from intestinal tissue during handling. The small intestine can accumulate excess vitamin C, even when body stores are low.

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    Area of Science:

    • Biochemistry
    • Gastroenterology
    • Nutritional Science

    Background:

    • Ascorbic acid (vitamin C) plays a crucial role in intestinal health and function.
    • Understanding ascorbic acid stability and tissue retention is vital for research and clinical applications.
    • Intestinal tissue handling can significantly impact measured ascorbic acid levels.

    Purpose of the Study:

    • To quantify ascorbic acid (vitamin C) loss from intestinal tissue during common laboratory procedures.
    • To investigate the retention capacity of small intestinal tissue for ascorbic acid.
    • To determine if the small intestine can accumulate and retain ascorbic acid under specific conditions.

    Main Methods:

    • Intestinal tissue samples were subjected to washing, blotting, and incubation in Krebs-phosphate saline.

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  • Ascorbic acid content was measured in both intestinal strips and chopped tissue over time.
  • Ascorbic acid levels were assessed after intramuscular dosing in animals with depleted body stores.

    • Main Results:

    • Approximately 20% of ascorbic acid was lost from intestinal tissue during washing and blotting.
    • Incubation led to further losses, with chopped tissue retaining only 50% of ascorbic acid after 10 minutes compared to 80% in strips.
    • The small intestine demonstrated an ability to accumulate double the normal ascorbic acid levels and retain significant amounts (0.7–5 µg/mg DNA) even during depletion.

    Conclusions:

    • Ascorbic acid is loosely held within intestinal tissue, leading to substantial losses during handling.
    • Small intestinal tissue has a notable capacity for ascorbic acid accumulation and retention.
    • These findings highlight the importance of careful handling of intestinal tissue for accurate ascorbic acid assessment and suggest a unique role for the small intestine in vitamin C homeostasis.