Amino Acid Analysis as a Basis for Personalized Preventive Healthcare

Amino Acid Analysis as a Basis for Personalized Preventive Healthcare

Amino acid analysis forms the basis of a preventive health test developed by OakLabs Scientific. The resulting amino acid profiles enable the assessment of selected metabolic parameters in relation to various health-related areas. The analytical implementation was carried out in cooperation with membraPure GmbH, which manufactures the ARACUS Amino Acid Analyzer in Hennigsdorf, near Berlin, Germany, and distributes it worldwide.

Amino acids are essential components of human metabolism. They not only serve as building blocks of proteins but are also involved in energy production, immune regulation, neurotransmitter synthesis, hormone metabolism, muscle development, and regeneration processes. Changes in amino acid profiles may therefore provide indications of metabolic imbalances.

The described health test is based on the measurement of selected amino acids and related metabolites. These are interpreted in the context of various health-related areas, including sleep and mood, chronic inflammation, cardiovascular risk, type 2 diabetes risk, thyroid metabolism, as well as fitness, muscle development, and regeneration.

The test is designed as a lifestyle and preventive health assessment. It does not replace a medical diagnosis or professional medical advice. Abnormal results should be evaluated by a healthcare professional, particularly in the presence of symptoms or existing risk factors.

The basic profile includes, among others, tryptophan, kynurenine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, and valine. The extended test profile may additionally include arginine, asymmetric dimethylarginine, alanine, proline, taurine, glutamine, serine, and tyrosine.

These analytes were selected because they are associated with important metabolic pathways. Tryptophan and kynurenine are relevant markers of tryptophan–kynurenine metabolism, which is associated with immune activation and inflammatory processes. The branched-chain amino acids valine, leucine, and isoleucine play important roles in muscle metabolism and energy balance and are also discussed in relation to insulin resistance and type 2 diabetes risk. Arginine and asymmetric dimethylarginine are involved in nitric oxide metabolism and are therefore of interest when assessing endothelial function and cardiovascular risk. Tyrosine and phenylalanine are precursors of important signaling molecules and are associated with catecholamine-related and thyroid-related metabolic pathways.

Sample Preparation and Analysis

Samples are collected by the customer using the provided health test kit. The kit contains the materials required for capillary blood collection and return shipment. A 300 µL lithium heparin tube is used for this purpose. It is important that the tube contains the full 300 µL of blood to ensure optimal analytical conditions. As an alternative to the finger lancet, an alternative blood collection device ("TAPmicro") for the upper arm can be ordered through the online shop.

In addition, health- and lifestyle-related information is collected through a questionnaire and taken into account during the subsequent presentation of results. The questionnaire is not part of the analytical measurement itself but supplements the laboratory results with contextual information. The combination of the quantitative amino acid profile and questionnaire data forms the basis for the personalized presentation of results.

Upon arrival at the laboratory, the blood sample is registered and uniquely identified using its assigned sample ID.

The analysis is performed using the ARACUS Amino Acid Analyzer. The amino acids are separated by ion-exchange chromatography, subsequently derivatized with ninhydrin using post-column derivatization, and detected photometrically. Chromatographic separation is performed using a high-resolution physiological method suitable for the determination of free amino acids and selected amino acid-related biomarkers.

Suitable amino acid standards and an internal standard are used for quantification. The standard mixture contains the relevant proteinogenic amino acids and is supplemented with additional amino acid-related biomarkers required for the test profile. For quality control, standards are analyzed regularly within the measurement sequence to ensure system stability and comparability of the results.

After completion of the measurement, the chromatographic data are evaluated and the concentrations of the selected amino acids and amino acid-related biomarkers are calculated. The results are subsequently combined with the information obtained from the health questionnaire and presented in a personalized results report.

The detailed evaluation algorithm and internal decision thresholds are part of the proprietary evaluation procedure and are not disclosed in this Application Note.

Results and Discussion

The interpretation of results is not based on individual amino acids considered in isolation but rather on the evaluation of defined metabolic patterns. The measured concentrations of selected amino acids and amino acid-related metabolites are assessed in relation to metabolic pathways described in scientific literature. Information from the health and lifestyle questionnaire is also considered to place the laboratory values into an individual context.

The resulting information is compiled into a personalized results report. The method presented in this Application Note focuses on the analytical determination of the relevant parameters.

The described health test combines analytical measurement data with a metabolism-oriented assessment of selected amino acid patterns. The resulting profile can support personalized recommendations in areas such as sleep and mood, chronic inflammation, cardiovascular metabolism, glucose and energy metabolism, thyroid-related metabolism, as well as fitness and regeneration.

Chronic Inflammation, Sleep, and Mood

Tryptophan and kynurenine are key analytes of the basic profile. Tryptophan is an essential amino acid and serves as a precursor of serotonin and melatonin. These metabolic pathways are associated with mood, sleep, and circadian regulation.

Kynurenine is formed from tryptophan through the kynurenine pathway. This metabolic pathway can be influenced by immune activation and inflammatory processes. Changes in the ratio between tryptophan and kynurenine may therefore provide indications of altered immune-associated metabolic activity.

Glucose and Energy Metabolism and Branched-Chain Amino Acids

The branched-chain amino acids (BCAAs) valine, leucine, and isoleucine are essential amino acids that play important roles in muscle and energy metabolism. At the same time, elevated BCAA concentrations have been associated in scientific literature with insulin resistance and an increased risk of type 2 diabetes.

Within the health test, the BCAA pattern is therefore considered a metabolic indicator related to glucose and insulin metabolism. Elevated BCAA levels do not constitute a diagnosis of diabetes. However, when considered alongside lifestyle factors, body weight, nutrition, and additional laboratory parameters, they may indicate areas where preventive measures could be beneficial.

Cardiovascular Risk

Arginine and asymmetric dimethylarginine (ADMA) are relevant markers for assessing nitric oxide metabolism. Arginine serves as a substrate for nitric oxide production, which plays an important role in vascular function and endothelial regulation. ADMA can inhibit nitric oxide synthase and is therefore discussed in relation to endothelial dysfunction and cardiovascular risk.

The determination of arginine and ADMA may provide additional insights into the regulation of vascular function. However, these values should not be considered in isolation but rather in conjunction with established risk factors such as blood pressure, lipid profile, smoking, age, body weight, and family history.

Thyroid-Related Metabolism

Tyrosine and phenylalanine are relevant to thyroid-related metabolic pathways. Phenylalanine can be converted into tyrosine, and tyrosine is an important precursor in the synthesis of thyroid hormones. Methionine and lysine also contribute to general protein metabolism and metabolic function.

Amino acid analysis cannot diagnose thyroid disorders. However, it may provide information about the availability of relevant precursors. In the presence of symptoms such as fatigue, sensitivity to cold, weight gain, or reduced physical performance, established thyroid parameters such as TSH, free T3 (fT3), free T4 (fT4), and thyroid antibodies should additionally be evaluated by a healthcare professional.

Fitness, Muscle Metabolism, and Regeneration

For fitness, muscle development, and regeneration, the branched-chain amino acids as well as alanine, proline, taurine, glutamine, and serine are of particular interest. These analytes are associated with muscle protein synthesis, energy balance, connective tissue metabolism, nitrogen transport, and recovery processes.

The amino acid profile may provide indications of whether essential and functionally relevant amino acids are sufficiently available. Based on these findings, recommendations regarding protein intake, protein quality, meal composition, recovery, and training support may be developed.