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Calculating the refractive index for pediatric parenteral nutrient solutions
Scott Nelson1, Jason Barrows, Richard Haftmann
1College of Pharmacy, University of Utah (UU), East Salt Lake City, UT, USA. scott.nelson2@imail.org
Summary
Refractometric analysis accurately calculates the refractive index (RI) of pediatric parenteral nutrition solutions. This method confirms dextrose and amino acid accuracy during compounding.
Area of Science:
- Pharmaceutical Compounding
- Analytical Chemistry
- Quality Control
Background:
- Parenteral nutrition (PN) solutions are complex mixtures requiring precise compounding.
- Accurate verification of PN composition is crucial for patient safety and therapeutic efficacy.
- Refractive index (RI) offers a potential rapid method for quality assessment.
Purpose of the Study:
- To evaluate the utility of refractometric analysis for calculating the refractive index (RI) of compounded parenteral nutrient solutions for pediatric patients.
- To develop and validate an equation for predicting the RI of PN solutions based on ingredient contributions.
Main Methods:
- Developed a predictive equation for PN solution RI using chemical and linear regression analysis on 154 pediatric PN solutions.
- Validated the equation by analyzing 1057 pediatric PN samples.
- Calculated RI by summing ingredient contributions and water RI, with ingredient contribution based on concentrate RI and volume.
Main Results:
- The calculated RI strongly correlated with the measured RI (R² = 0.94, p < 0.0001).
- 99.8% of samples fell within a two standard deviation range (±0.0045) of the measured RI.
- Electrolytes, vitamins, and trace elements did not significantly affect RI at used concentrations.
Conclusions:
- No statistical difference was found between calculated and measured RI in final pediatric PN products.
- This refractometric method serves as a reliable quality control tool for compounding accuracy of dextrose and amino acids.
- Hospital laboratories can perform electrolyte verification on PN samples.
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