L-Tyrosine Disodium Salt elemental analysis

Elemental analysis is an important characterization approach for L-Tyrosine Disodium Salt. By determining the proportions of carbon, hydrogen, nitrogen, and sodium, researchers can compare experimental composition with the theoretical composition of the target material.
For the anhydrous compound, the reported molecular composition is C9H9NNa2O3 with a molecular weight of approximately 225.15 g/mol. PubChem identifies this material as the disodium salt of L-tyrosine.
Elemental analysis can therefore provide useful supporting information for identity confirmation, batch characterization, and investigation of composition changes.
Molecular Composition and Element Distribution
L-Tyrosine Disodium Salt contains carbon, hydrogen, nitrogen, sodium, and oxygen.
The carbon and hydrogen components originate mainly from the amino acid framework, while nitrogen is associated with the amino group. Two sodium ions compensate for the two negatively charged sites in the disodium salt structure.
Because sodium is introduced through salt formation, its measured content can provide useful information when evaluating whether the material has the expected salt composition.
Theoretical Elemental Composition
For the anhydrous form, theoretical elemental percentages can be calculated from the molecular composition and atomic weights.
Using the reported molecular formula, the approximate theoretical composition is:
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Carbon: about 48.0%
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Hydrogen: about 4.0%
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Nitrogen: about 6.2%
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Sodium: about 20.4%
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Oxygen: about 21.3%
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These values represent theoretical calculations rather than specifications for an individual commercial batch.
Actual analytical results can differ because of moisture, hydration, residual inorganic components, impurities, or differences in sample preparation.
Importance of Hydration State
Hydration state is particularly important when interpreting elemental analysis results.
Commercial L-Tyrosine Disodium Salt may be supplied in hydrated form. PubChem separately identifies an anhydrous form and a dihydrate, with the dihydrate having a molecular weight of approximately 261.18 g/mol.
Therefore, an elemental-analysis result should always be interpreted together with water-content or thermogravimetric information when the material may contain variable amounts of water.
Carbon Analysis
Carbon determination provides information about the organic portion of the compound.
For a relatively pure material, the measured carbon content should be reasonably consistent with the theoretical value calculated from the expected composition. Significant deviation may indicate residual components, different hydration conditions, or sample heterogeneity.
Carbon analysis is therefore useful as one component of a broader characterization strategy.
Hydrogen Analysis
Hydrogen analysis is more sensitive to water content than carbon analysis.
Because hydrated L-Tyrosine Disodium Salt may contain crystallization water or absorbed moisture, the measured hydrogen value can be influenced by the physical state of the sample.
For this reason, hydrogen results should not normally be interpreted independently when analyzing a material supplied as a hydrate.
Nitrogen Analysis
Nitrogen is associated with the amino acid portion of L-Tyrosine Disodium Salt.
Nitrogen determination can therefore provide useful compositional information and can be combined with carbon and hydrogen results to assess the consistency of the organic component.
Combustion-based CHN analysis is commonly considered when carbon, hydrogen, and nitrogen need to be evaluated simultaneously.
Sodium Analysis
Sodium determination is particularly relevant for a disodium salt.
Unlike carbon, hydrogen, and nitrogen, sodium is an inorganic element introduced during salt formation. Techniques such as ICP-OES or ICP-MS can provide quantitative sodium measurements after suitable sample dissolution and dilution.
Comparing sodium content with the theoretical composition can help evaluate salt stoichiometry.
Oxygen Determination
Oxygen is commonly calculated by difference in routine CHN-based elemental analysis when direct oxygen determination is not performed.
For greater analytical completeness, direct oxygen determination can also be considered using an appropriate instrumental method.
In practical quality-control programs, oxygen is often less informative when interpreted alone and is better considered together with the other elemental results.
Combustion Elemental Analysis
Combustion elemental analysis is one of the established approaches for determining carbon, hydrogen, and nitrogen.
A weighed sample is combusted under controlled conditions, and the resulting gases are separated and quantified. The instrument then converts the measured amounts into elemental percentages.
For L-Tyrosine Disodium Salt, this approach can provide a useful CHN profile for comparison with theoretical values.
ICP-Based Sodium Analysis
Because sodium is not normally covered by standard CHN combustion analysis, an independent inorganic-element technique can be used.
ICP-OES is particularly suitable for quantitative sodium determination when the sample can be completely dissolved in an appropriate medium. ICP-MS can also provide highly sensitive elemental measurements when required.
Combining CHN with ICP-based sodium analysis gives a more complete elemental profile.
Sample Preparation
Sample preparation can strongly influence elemental analysis results.
The material should be adequately homogenized before testing. When analyzing a hydrate or moisture-sensitive powder, excessive exposure to ambient humidity should also be avoided.
For ICP analysis, the sample needs to be completely dissolved or appropriately digested before measurement. Incomplete dissolution can produce artificially low or variable elemental results.
Influence of Moisture
Moisture is one of the most important factors affecting elemental percentages.
Commercial specifications demonstrate that L-Tyrosine Disodium Salt can be supplied with measurable water content, and some products are explicitly described as hydrates. For example, TCI lists water content as part of its specification for a hydrated product, while Thermo Fisher provides a separate specification for the dihydrate form.
Therefore, laboratories should clearly distinguish between results reported on an as-received basis and results normalized to an anhydrous basis.
Comparison with Water Content Analysis
Elemental analysis and water-content testing provide complementary information.
If carbon, hydrogen, and nitrogen results appear lower than expected, moisture or hydration may be one possible explanation. Measuring water content independently can help determine whether the difference is caused by hydration rather than by changes in chemical composition.
Thermogravimetric analysis can also provide useful information about water loss as temperature increases.
Elemental Analysis for Identity Confirmation
Elemental analysis can contribute to the identification of L-Tyrosine Disodium Salt, but it is generally not sufficient as a standalone identity test.
A stronger characterization package can combine elemental composition with infrared spectroscopy, NMR, chromatographic purity analysis, optical rotation, and water determination.
Commercial specifications already demonstrate the use of several complementary methods, including HPLC, infrared spectroscopy, optical rotation, and water analysis.
Elemental Analysis and Purity Assessment
Elemental analysis can support purity assessment by identifying broad compositional deviations.
However, two samples can have similar elemental percentages while containing different molecular impurities. Therefore, elemental analysis should generally be treated as a supporting technique rather than a direct replacement for chromatographic purity testing.
HPLC or other suitable analytical methods are more appropriate when specific organic impurities need to be separated and quantified.
Batch-to-Batch Comparison
For manufacturing quality control, elemental analysis can be used to compare different production batches.
Consistent carbon, hydrogen, nitrogen, and sodium results can support evidence of compositional consistency. Unexpected changes may prompt further investigation into raw materials, salt formation, drying, purification, or storage.
This makes elemental analysis potentially useful for process-development and supplier-qualification studies.
Elemental Analysis During Process Development
During process optimization, elemental analysis can help evaluate changes in the material produced under different reaction conditions.
For example, changes in salt formation, purification, washing, drying, or crystallization may alter the final composition. Elemental data can then be compared with process parameters to identify potential sources of variation.
This approach is particularly useful when combined with chromatographic and spectroscopic characterization.
Anhydrous and Hydrated Forms
A major consideration in L-Tyrosine Disodium Salt elemental analysis is whether the sample is anhydrous, monohydrated, dihydrated, or contains variable water.
The reported dihydrate has a different molecular formula and molecular weight from the anhydrous material.
Consequently, theoretical elemental values must be calculated using the correct chemical form. Comparing a hydrated sample directly with theoretical values for the anhydrous compound can lead to misleading conclusions.
Data Normalization
For reliable comparison, laboratories should clearly define the reporting basis.
Results can be reported on an as-received basis, dry basis, or anhydrous basis depending on the analytical objective. The selected basis should be stated clearly in technical reports and certificates of analysis.
Consistent reporting makes it easier to compare batches and suppliers.
Combining Elemental Analysis with Spectroscopy
Elemental analysis provides information about overall elemental composition, while spectroscopy provides structural information.
Infrared spectroscopy can support functional-group identification, whereas NMR can provide information about the molecular framework. Mass spectrometry can further support molecular-mass and structural characterization.
Combining these methods provides a more complete analytical profile than relying on elemental analysis alone.
Combining Elemental Analysis with Chromatography
Chromatographic analysis is particularly useful for evaluating chemical purity.
Elemental analysis can confirm whether the overall elemental composition is consistent with the expected material, while HPLC can separate and quantify relevant organic components.
The combination can therefore distinguish between broad compositional consistency and detailed chemical purity.
Quality Control Applications
In routine quality control, elemental analysis can be incorporated into a broader analytical program.
A typical strategy may include raw-material inspection, identification testing, assay or purity testing, water determination, elemental composition, and physical-property evaluation.
The exact testing frequency should depend on the material grade, manufacturing process, intended application, and quality-management requirements.
Future Development of Elemental Analysis
Future elemental-analysis research for L-Tyrosine Disodium Salt can focus on improving measurement reproducibility, reducing sample-preparation requirements, and integrating elemental results with spectroscopic and chromatographic datasets.
Automated data processing can also help identify deviations from established batch profiles and support more efficient quality monitoring.
For production-scale applications, elemental analysis may increasingly become part of a multidimensional quality database rather than an isolated laboratory measurement.
Conclusion
Elemental analysis provides useful compositional information for L-Tyrosine Disodium Salt, particularly for carbon, hydrogen, nitrogen, and sodium. The anhydrous material is reported as C9H9NNa2O3 with a molecular weight of approximately 225.15 g/mol, while hydrated forms require separate consideration because crystallization water changes the overall composition.
For reliable characterization, elemental analysis should be combined with water determination, spectroscopy, chromatography, and other suitable analytical techniques. This integrated approach can support identity confirmation, batch comparison, process optimization, and quality-control studies of L-Tyrosine Disodium Salt.