Purpose

Define user requirements for a standalone FUZKK utility that accepts laboratory CSV data, evaluates the records using limits embedded in code, and produces LabWare-compatible JSON.

Scope

The utility is intended for preliminary QC/QA review, integration testing, LIMS/LabWare flow and evidence-trail preparation. Final release decisions remain under the laboratory's validated procedure and responsible personnel.

Users

QC analyst, QA reviewer, CSV/validation engineer, LIMS/LabWare integration engineer, responsible laboratory specialist.

User requirements

1. The utility shall run without arguments and print its self-description, a built-in input.csv example from GetDemoData(), and demo evaluation for the embedded records.
2. The utility shall run with two arguments: input.csv output.json.
3. The utility shall not read input.csv and shall not write output.json when started without arguments.
4. CSV numeric values shall be parsed using CultureInfo.InvariantCulture.
5. Output shall be generated as LabWare-compatible JSON with Header, Samples, Results, Status, StatusCode, ErrorMessage, Description and DescriptionEN.
6. For PASS records, ErrorMessage shall be an empty string.
7. Embedded limits shall follow this priority: Ph. Eur. → British Pharmacopoeia / UK implementation → EAEU / regional requirements → EMA/ICH/EU guidance → USP fallback.
8. If an exact monograph is not known, strict standard API limits are used where applicable: assay 98–102%, total impurities ≤1.0%, individual impurity ≤0.5%.
9. For biologics and mAb-like products, aggregation, sterility and endotoxin checks shall be included where relevant to the utility purpose.
10. If a parameter may arrive in different units, the unit shall be represented as a separate input field or explicitly reflected in the input.csv field name.

Input CSV

BatchNumber,ProductName,Fluorescence_Total,Fluorescence_Free,Background_Fluorescence,Concentration_Total_ng_ml,Concentration_Free_ng_ml,StandardCurve_R2,CV_Percent
LNP-EE-2026-001,mRNA-LNP Vaccine,50000,2500,100,1000.0,50.0,0.998,4.5
LNP-EE-2026-002,mRNA-LNP Booster,45000,5000,120,900.0,100.0,0.995,5.0
LNP-EE-2026-003,mRNA-LNP Therapeutic,60000,1500,90,1200.0,30.0,0.999,3.2

input.csv fields

Utility description

LNP Encapsulation Efficiency Analyzer — LNP Encapsulation Efficiency Analyzer

LNP Encapsulation Efficiency Analyzer — LNP Encapsulation Efficiency Analyzer

ℹ️ Utility calculates % of encapsulated mRNA in lipid nanoparticles:
• Encapsulation Efficiency (≥90%)
• Free mRNA content (≤10%)
• Total RNA concentration
• Calibration curve quality (R²)

⚠️ CRITICAL: Free mRNA degrades rapidly and causes inflammation!
Low encapsulation reduces therapeutic efficacy.

Usage:
LNPEncapsulationEfficiencyAnalyzer.exe → demo mode (console output)
LNPEncapsulationEfficiencyAnalyzer.exe input.csv output.json → evaluate your data

Input format:
BatchNumber,ProductName,Fluorescence_Total,Fluorescence_Free,Background_Fluorescence,Concentration_Total_ng_ml,Concentration_Free_ng_ml,StandardCurve_R2,CV_Percent

Example:
LNP-EE-2026-001,mRNA-LNP Vaccine,50000,2500,100,1000.0,50.0,0.998,4.5

— WHY IS THIS NEEDED?
Encapsulation control is critical for mRNA drugs (Moderna, BioNTech, CureVac):
• Lipid Nanoparticles (LNP) protect fragile mRNA from nucleases in blood
• Free mRNA is not efficiently delivered to cells and may activate immune system non-specifically
• High encapsulation efficiency (>90%) is a key quality indicator of microfluidics process
• Method is typically based on fluorescent dye (RiboGreen) which penetrates LNP only with detergent

⚠️ CRITICAL:
• Encapsulation Efficiency ≥90% — standard for clinical batches
• Free mRNA ≤10% — minimization of side effects and drug loss
• Calibration curve accuracy (R² ≥0.99) — guarantee of calculation correctness
• Low variability (CV ≤10%) — method reproducibility
• Concentration must match label claim for proper dosing

Key features:
• Automatic EE% calculation from raw fluorimetry data
• Assay quality control (R², CV)
• Separate accounting of total and free RNA fractions
• Support for various mRNA-LNP products

Critical parameters:
• Encapsulation Efficiency: ≥90%
• Free mRNA: ≤10%
• Calibration R²: ≥0.99
• CV: ≤10%

💡 Usage tips:
1. Use detergent (Triton X-100) to completely disrupt LNP for total RNA measurement
2. Correctly subtract buffer background signal
3. Perform analysis immediately after sample preparation as free mRNA may degrade
4. For high concentrations, use dilutions to stay in linear detector range
5. Compare data with PCR method for result confirmation

⚠️ Note: Unlike simple solutions, LNPs are a colloidal system. Measuring "free" fraction requires care to avoid accidental particle disruption. The utility helps standardize calculations and avoid manual data entry errors.

Traceability and limitations

• The URS is used as the source document for functional specification, CSV review and later validation work.
• This document does not replace an approved pharmacopoeial monograph, validated analytical method or internal product specification.
• For product-specific limits, the approved customer specification takes priority.

The functional specification describes the behaviour of the standalone FUZKK console utility, input-data format, evaluation algorithm and output JSON structure.

Functional flow

1. Main() checks the number of arguments.
2. If no arguments are provided: PrintHello() prints the description and built-in input.csv example, then RunDemoEvaluation() executes Evaluate() over GetDemoData() and prints demo JSON.
3. If two arguments are provided: RunWithFiles(input.csv, output.json) reads CSV, evaluates each record and writes LabWare-compatible JSON.
4. LoadData() uses CultureInfo.InvariantCulture and shall not be called in no-arguments mode.
5. Evaluate() returns a named tuple with BatchNumber, ProductName, Parameters, CriticalFailCount, WarningCount, Recommendation and RecommendationEN.
6. GetIssues() builds messages for ErrorMessage in WARNING/FAIL cases.

Evaluation rules

• PASS: CriticalFailCount = 0 and WarningCount = 0.
• WARNING: CriticalFailCount = 0 and WarningCount > 0.
• FAIL: CriticalFailCount > 0.
• ERROR: exception during reading or processing.
• ErrorMessage remains empty for PASS.
• Limits are embedded in Program.cs; no external limit configuration is required.

Input and fields

BatchNumber,ProductName,Fluorescence_Total,Fluorescence_Free,Background_Fluorescence,Concentration_Total_ng_ml,Concentration_Free_ng_ml,StandardCurve_R2,CV_Percent
LNP-EE-2026-001,mRNA-LNP Vaccine,50000,2500,100,1000.0,50.0,0.998,4.5
LNP-EE-2026-002,mRNA-LNP Booster,45000,5000,120,900.0,100.0,0.995,5.0
LNP-EE-2026-003,mRNA-LNP Therapeutic,60000,1500,90,1200.0,30.0,0.999,3.2

Output JSON

{
  "Header": {
    "UtilityName": "LNP_Encapsulation_Efficiency_Analyzer",
    "Version": "1.0.0",
    "Timestamp": "UTC",
    "InstrumentID": "FUZKK-QC-WORKSTATION",
    "OperatorID": "Admin"
  },
  "Samples": [
    {
      "SampleID": "from BatchNumber",
      "BatchNumber": "from CSV",
      "ProductName": "from CSV",
      "TestName": "utility-specific test",
      "AnalysisCode": "utility-specific code",
      "Status": "PASS | WARNING | FAIL | ERROR",
      "StatusCode": "1 | 2 | 0 | -1",
      "ErrorMessage": "",
      "Description": "Russian recommendation",
      "DescriptionEN": "English recommendation",
      "Results": [
        {
          "ParameterName": "parameter",
          "ResultValue": 0.0,
          "UnitOfMeasure": "unit",
          "SpecificationLimit": "limit",
          "IsWithinSpec": true
        }
      ]
    }
  ]
}