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Bioavailability is a major determinant of nutritional status. In order to determine a safe level of folate fortification, its bioavailability must be assessed, so that risk-benefit analysis can be carried out. Recently, a mathematical model of folate true absorption which takes into account the liver first pass was devised (ref 1). In this model, the volume of distribution is a convenient method for describing how well a nutrient is removed from plasma and distributed into tissues.
In this study, volume of distribution will be more accurately estimated using an intravenous dose of labelled (13C5) dose of natural folate (5-methyltetrahydrofolic acid) in healthy adults aged 18-65, over a wide body mass index (BMI) range.
Healthy adults will be given an IV dose of a small amount of 13C5 5-methyltetrahydrofolic acid, and blood samples will be taken at regular time points via a cannula over a 2hr time period.
The primary objective is to estimate the sampled plasma pool volume of distribution in order to quantify the fraction of any folate test dose, or folate metabolites, appearing in systemic plasma circulation in future studies of bioavailability.
Endpoint Classification: Pharmacokinetics Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Basic Science
13C5-labelled 5-methyltetrahydrofolic acid
Institute of Food Research
Active, not recruiting
Institute of Food Research
Published on BioPortfolio: 2014-08-27T03:19:24-0400
The current study is designed as a phase I multiple dose study to evaluate the pharmacokinetics and bioavailability of [14C]-labelled oxytocin in healthy women.
This is a Phase I, open label, single-site trial to evaluate the in vivo release characteristics in the gastrointestinal tract of metronidazole benzoate capsules designed to disintegrate i...
The purpose of the study is to determine the bioavailability of orally administered folic acid compared with the i.v. administered folic acid, and to use the samples collected to validate ...
The purpose of this study is to determine the kinetics of 13C-eicosapentaenoic acid (EPA) and 13C-arachidonic acid (AA) in young and older participants
Hydrolysis of dietary protein may impact their gastrointestinal kinetics and further metabolism. The primary goal of this work was to measure the metabolic fate of intact or hydrolyzed pro...
Citric acid has been used for over six decades to induce cough; however the mechanism of its pro-tussive effect is still not fully understood. We assessed the response to inhalation of citric acid at ...
In vivo tracking of transplanted stem cells has been a central aim of stem cell therapy. Although many tracking systems have been introduced, no method has yet been validated for clinical application...
Hepatic energy metabolism negatively relates to insulin resistance and liver fat content in type 2 diabetes patients, but its role in metabolically healthy humans is unclear. We hypothesized that intr...
The study aims to establish the reference intervals (RIs) for total bilirubin (TBIL), direct bilirubin (DBIL), urea (UR), and uric acid (UA) in healthy Chinese geriatric population.
Citrin (mitochondrial aspartate-glutamate transporter) deficiency causes the failures in both carbohydrate-energy metabolism and the urea cycle, and the alterations in the serum levels of several amin...
Healthy People Programs are a set of health objectives to be used by governments, communities, professional organizations, and others to help develop programs to improve health. It builds on initiatives pursued over the past two decades beginning with the 1979 Surgeon General's Report, Healthy People, Healthy People 2000: National Health Promotion and Disease Prevention Objectives, and Healthy People 2010. These established national health objectives and served as the basis for the development of state and community plans. These are administered by the Office of Disease Prevention and Health Promotion (ODPHP). Similar programs are conducted by other national governments.
Governmental guidelines and objectives pertaining to public food supply and nutrition including recommendations for healthy diet and changes in food habits to ensure healthy diet.
A species of Lactobacillus that occurs in the human GASTROINTESTINAL TRACT and the VAGINA of healthy women. It produces LACTIC ACID and HYDROGEN PEROXIDE, and is used as a PROBIOTIC. It is also used for the treatment and prevention of BACTERIAL VAGINOSIS.
Surgical reinnervation of a denervated peripheral target using a healthy donor nerve and/or its proximal stump. The direct connection is usually made to a healthy postlesional distal portion of a non-functioning nerve or implanted directly into denervated muscle or insensitive skin. Nerve sprouts will grow from the transferred nerve into the denervated elements and establish contact between them and the neurons that formerly controlled another area.
An imaging technique using compounds labelled with short-lived positron-emitting radionuclides (such as carbon-11, nitrogen-13, oxygen-15 and fluorine-18) to measure cell metabolism. It has been useful in study of soft tissues such as CANCER; CARDIOVASCULAR SYSTEM; and brain. SINGLE-PHOTON EMISSION-COMPUTED TOMOGRAPHY is closely related to positron emission tomography, but uses isotopes with longer half-lives and resolution is lower.
Blood is a specialized bodily fluid that delivers necessary substances to the body's cells (in animals) – such as nutrients and oxygen – and transports waste products away from those same cells. In vertebrates, it is composed of blo...
Within medicine, nutrition (the study of food and the effect of its components on the body) has many different roles. Appropriate nutrition can help prevent certain diseases, or treat others. In critically ill patients, artificial feeding by tubes need t...
Hepatology is the study of liver, gallbladder, biliary tree, and pancreas, and diseases associated with them. This includes viral hepatitis, alcohol damage, cirrhosis and cancer. As modern lifestyles change, with alcoholism and cancer becoming more promi...