Quality Validation & QC Systems
1. Method Validation — Parameters and Protocol
All analytical test methods used for raw material, in-process, and finished product release are validated according to ICH Q2(R1) and AOAC International guidelines. The following parameters are evaluated for each method during initial validation and subsequent re-validation (triggered by method changes, instrument changes, or at intervals not exceeding 3 years).
1.1 Validation Parameters
| Parameter |
Definition |
Acceptance Criterion |
| Accuracy (Trueness) |
Closeness of agreement between measured value and true/reference value, expressed as % recovery |
98–102% (or as specified per method) |
| Precision (Repeatability) |
Agreement among replicate measurements under same conditions (same operator, instrument, day) |
RSD ≤ 2% (or as specified) |
| Intermediate Precision (Reproducibility) |
Agreement among replicates across operators, instruments, and days |
RSD ≤ 3% (or as specified) |
| Limit of Detection (LOD) |
Lowest concentration that can be reliably detected (S/N ≥ 3:1 or 3σ of blank) |
≤ 1/10 of specification limit |
| Limit of Quantification (LOQ) |
Lowest concentration that can be quantified with acceptable accuracy and precision (S/N ≥ 10:1 or 10σ of blank) |
≤ ⅕ of specification limit |
| Linearity |
Ability to obtain test results proportional to concentration over a defined range |
( r^2 \geq 0.995 ) |
| Range |
Interval between upper and lower concentrations with demonstrated precision, accuracy, and linearity |
Covers 50–150% of expected specification range |
| Robustness |
Capacity to remain unaffected by small, deliberate variations in method parameters |
RSD ≤ 2% across varied conditions |
| Selectivity / Specificity |
Ability to measure analyte unequivocally in presence of matrix components |
No interference > LOD at retention time |
| Uncertainty |
Combined standard uncertainty from all validated sources |
See Section 6 |
1.2 Validation Protocol Requirements
Each validation study follows a pre-approved validation protocol that specifies:
- Number of replicates (minimum 10 for precision, minimum 3 concentration levels × 3 replicates for accuracy)
- Reference materials (certified reference material [CRM] or in-house reference standard with traceable assignment)
- Statistical treatment (ANOVA for precision components, linear regression for linearity, Student's t-test for bias)
- Acceptance criteria (pre-defined before study initiation)
- Outlier handling (Grubbs' test, α = 0.05)
2. Validation Data for Key Analytical Methods
2.1 Moisture Content — Air Oven Method (AOCS Ba 2a-38)
| Parameter |
Result |
Acceptance Criterion |
Status |
| Repeatability (SD) |
0.10% |
≤ 0.15% |
✅ Pass |
| Repeatability (RSD) |
1.1% (at 8.5% moisture) |
≤ 2.0% |
✅ Pass |
| Intermediate precision (SD) |
0.12% |
≤ 0.20% |
✅ Pass |
| Accuracy (% recovery on CRM) |
99.7% |
98.0–102.0% |
✅ Pass |
| LOD |
0.03% |
— |
✅ Acceptable |
| LOQ |
0.10% |
— |
✅ Acceptable |
| Linearity (( r^2 )) |
0.998 |
≥ 0.995 |
✅ Pass |
| Range |
0.1–20.0% H₂O |
1.0–15.0% (required) |
✅ Pass |
2.2 Protein Content — Dumas Combustion (AOCS Ba 4e-93 / AOAC 990.03)
| Parameter |
Result |
Acceptance Criterion |
Status |
| Repeatability (RSD) |
1.8% (at 36% protein d.b.) |
≤ 2.0% |
✅ Pass |
| Intermediate precision (RSD) |
2.2% |
≤ 3.0% |
✅ Pass |
| Accuracy (% recovery on CRM) |
100.3% |
98.0–102.0% |
✅ Pass |
| LOD |
0.05% N (0.31% protein) |
— |
✅ Acceptable |
| LOQ |
0.10% N (0.63% protein) |
— |
✅ Acceptable |
| Linearity (( r^2 )) |
0.9996 |
≥ 0.995 |
✅ Pass |
| Range |
0.63–60.0% protein |
5.0–50.0% (required) |
✅ Pass |
2.3 Alpha-Linolenic Acid (ALA) by GC-FID (AOCS Ce 1h-05)
| Parameter |
Result |
Acceptance Criterion |
Status |
| Repeatability (RSD) |
1.4% (at 52% ALA of total FA) |
≤ 1.5% |
✅ Pass |
| Intermediate precision (RSD) |
1.7% |
≤ 2.5% |
✅ Pass |
| Accuracy (% recovery on CRM) |
100.1% |
98.0–102.0% |
✅ Pass |
| LOD |
0.02% of total FAME |
— |
✅ Acceptable |
| LOQ |
0.06% of total FAME |
— |
✅ Acceptable |
| Linearity (( r^2 )) |
0.999 |
≥ 0.995 |
✅ Pass |
| Range |
0.06–70.0% ALA |
10.0–65.0% (required) |
✅ Pass |
2.4 Free Fatty Acids (FFA) — Titration (AOCS Ca 5a-40)
| Parameter |
Result |
Acceptance Criterion |
Status |
| Repeatability (RSD) |
1.6% (at 1.5% FFA as oleic) |
≤ 2.0% |
✅ Pass |
| Intermediate precision (RSD) |
2.0% |
≤ 3.0% |
✅ Pass |
| Accuracy (% recovery) |
99.5% |
98.0–102.0% |
✅ Pass |
| LOD |
0.02% FFA |
— |
✅ Acceptable |
| LOQ |
0.05% FFA |
— |
✅ Acceptable |
| Linearity (( r^2 )) |
0.997 |
≥ 0.995 |
✅ Pass |
| Range |
0.05–10.0% FFA |
0.1–5.0% (required) |
✅ Pass |
2.5 Peroxide Value (PV) — Titration (AOCS Cd 8b-90)
| Parameter |
Result |
Acceptance Criterion |
Status |
| Repeatability (RSD) |
2.5% (at 2.0 meq/kg) |
≤ 3.0% |
✅ Pass |
| Intermediate precision (RSD) |
3.1% |
≤ 4.0% |
✅ Pass |
| Accuracy (% recovery) |
99.2% |
97.0–103.0% |
✅ Pass |
| LOD |
0.05 meq/kg |
— |
✅ Acceptable |
| LOQ |
0.15 meq/kg |
— |
✅ Acceptable |
| Linearity (( r^2 )) |
0.996 |
≥ 0.995 |
✅ Pass |
| Range |
0.15–25.0 meq/kg |
0.2–15.0 (required) |
✅ Pass |
3. Control Charts for Routine QC
3.1 X-bar and R Chart Implementation
All routine QC parameters are monitored using Shewhart X-bar and R control charts as per ASTM E2587 and ISO 7870-2. Charts are maintained in the LIMS (LabWare v8) with automated data entry from analytical instruments.
3.2 Parameters and Sampling Frequency
| Parameter |
Product |
Frequency |
Subgroup Size (n) |
Chart Period |
| Moisture (%) |
Meal |
1 per production shift |
5 replicate readings |
Rolling 25 subgroups |
| Protein (% d.b.) |
Meal |
1 per production shift |
5 replicate readings |
Rolling 25 subgroups |
| ALA (% of total FA) |
Oil |
1 per batch |
3 replicate injections |
Rolling 25 subgroups |
| FFA (%) |
Oil (crude) |
1 per batch |
3 replicates |
Rolling 25 subgroups |
| FFA (%) |
Oil (refined) |
1 per batch |
3 replicates |
Rolling 25 subgroups |
| Peroxide value (meq/kg) |
Oil (RBD) |
1 per batch |
3 replicates |
Rolling 25 subgroups |
| Color (Lovibond, red) |
Oil (RBD) |
1 per batch |
3 replicates |
Rolling 25 subgroups |
3.3 Control Limits
Control limits are calculated from 20 initial subgroups (minimum 100 individual readings) and reviewed quarterly. Limits are updated when justified by process improvement or when 25 new subgroups demonstrate a sustained shift.
- Warning Limits (Upper/Lower): mean ± 2σ (plotted as dashed lines)
- Action Limits (Upper/Lower): mean ± 3σ (plotted as solid red lines)
- Range Limits (Upper): ( D_4 \times \bar{R} )
3.4 Out-of-Control Rules (Western Electric Rules)
The following rules trigger investigation and corrective action:
| Rule |
Description |
Action |
| Rule 1 |
Any point beyond ±3σ (action limit) |
Immediate hold, root cause investigation |
| Rule 2 |
2 of 3 consecutive points beyond ±2σ (on same side) |
Alert, increased monitoring frequency |
| Rule 3 |
4 of 5 consecutive points beyond ±1σ (on same side) |
Alert, investigate assignable cause |
| Rule 4 |
8 consecutive points on same side of center line |
Alert, evaluate for process bias adjustment |
| Rule 5 |
6 consecutive points trending up or down |
Alert, check instrument drift |
| Rule 6 |
Any point beyond UCL on R chart |
Increase in variability, instrument/operator check |
| Rule 7 |
14 consecutive points alternating up/down |
Possible over-control or sampling issue |
3.5 Example — Moisture Control Chart (Meal)
Current operating state (last 25 subgroups, n=5, data from Q2 2026):
| Parameter |
Value |
| Grand mean ((\bar{\bar{x}})) |
8.52% |
| UCL ((\bar{x})) |
8.92% |
| LCL ((\bar{x})) |
8.12% |
| UWL ((\bar{x})) |
8.78% |
| LWL ((\bar{x})) |
8.26% |
| Mean range ((\bar{R})) |
0.28% |
| UCL ((R)) |
0.62% |
| Process capability (Cpk) |
1.53 |
4. Proficiency Testing
4.1 Program Overview
The laboratory participates in external proficiency testing (PT) schemes to demonstrate technical competence and comply with ISO/IEC 17025 requirements. Successful participation is mandatory for method accreditation maintenance.
4.2 Participation Schedule
| Analysis Type |
Scheme Provider |
Frequency |
Samples per Round |
Accredited Since |
| Food microbiology (APC, Coliforms, E. coli, Salmonella, Yeast/Mold) |
FAPAS (Fera Science) |
2× per year (Apr, Oct) |
2 per round |
2018 |
| Oilseed chemistry (moisture, protein, oil, fiber) |
AOCS Laboratory Proficiency Program |
1× per year (September) |
2 per round |
2019 |
| Fatty acid profile (GC-FID) |
AOCS Laboratory Proficiency Program |
1× per year (March) |
2 per round |
2019 |
| Oil quality (FFA, PV, color, anisidine value) |
LGC Standards (QCS) |
1× per year (June) |
2 per round |
2020 |
| Trace metals (ICP-MS) |
FAPAS |
1× per year (November) |
2 per round |
2021 |
| Mycotoxins (aflatoxins, DON, OTA) |
FAPAS |
1× per year (August) |
2 per round |
2021 |
Performance is assessed using the z-score:
[
z = \frac{(x_i - x_a)}{\sigma_p}
]
where ( x_i ) = reported result, ( x_a ) = assigned value, ( \sigma_p ) = standard deviation for proficiency assessment.
| z-score |
Rating |
Action |
| |z| ≤ 2.0 |
Satisfactory |
None required |
| 2.0 < |z| < 3.0 |
Warning (Questionable) |
Investigate, document root cause |
| |z| ≥ 3.0 |
Unsatisfactory |
Mandatory root cause analysis, corrective action, re-testing within 30 days |
Over the past 5 years (2021–2026):
- 98.2% of results rated Satisfactory (|z| ≤ 2.0)
- 1.5% rated Questionable (2.0 < |z| < 3.0) — all resolved with corrective action
- 0.3% rated Unsatisfactory (|z| ≥ 3.0) — 2 events (one pH meter calibration drift in 2022, one FFA titration endpoint detection issue in 2023), both closed with CAPA
5. Inter-Laboratory Comparison
5.1 Annual Round Robin Protocol
An inter-laboratory comparison (round robin) is conducted annually in November with our partner laboratory (Eurofins Scientific, Hamburg, Germany). The protocol follows ISO 5725-2.
5.2 Scope and Samples
| Parameter |
Material |
Expected Range |
Lab 1 (Internal) Method |
Lab 2 (Partner) Method |
| Moisture |
Flaxseed meal |
7–10% |
AOCS Ba 2a-38 |
ISO 665:2020 |
| Protein (N×6.25) |
Flaxseed meal |
32–38% d.b. |
AOCS Ba 4e-93 |
ISO 16634:2016 |
| Oil content |
Flaxseed |
38–44% |
AOCS Am 2-93 |
ISO 659:2009 |
| ALA (C18:3n-3) |
Flaxseed oil |
48–58% of FA |
AOCS Ce 1h-05 |
AOCS Ce 1i-07 |
| FFA |
Crude flax oil |
0.5–3.0% |
AOCS Ca 5a-40 |
AOCS Ca 5a-40 |
| Peroxide value |
Refined oil |
0–5 meq/kg |
AOCS Cd 8b-90 |
ISO 3960:2017 |
5.3 Evaluation Criteria
| Metric |
Acceptance Criterion |
| Reproducibility SD (S_R) |
≤ 1.5× Horwitz SD (for composition) or ≤ 2× method precision (for oil quality) |
| HorRat value |
0.3 ≤ HorRat ≤ 1.5 |
| Bias between labs |
Not statistically significant at α = 0.05 (paired t-test) |
| Relative bias |
≤ 3% for major components (> 10% concentration), ≤ 10% for trace components |
5.4 2025 Round Robin Results (Selected Parameters)
| Parameter |
Internal Lab Mean |
Partner Lab Mean |
Bias |
HorRat |
Status |
| Moisture (%) |
8.51 |
8.47 |
+0.04 |
0.42 |
✅ Pass |
| Protein (% d.b.) |
35.8 |
35.5 |
+0.3 |
0.51 |
✅ Pass |
| ALA (% of FA) |
52.3 |
52.0 |
+0.3 |
0.38 |
✅ Pass |
| FFA (%) |
1.18 |
1.21 |
−0.03 |
0.55 |
✅ Pass |
| PV (meq/kg) |
0.92 |
0.88 |
+0.04 |
0.61 |
✅ Pass |
6. Uncertainty Budget
6.1 Methodology
Measurement uncertainty is estimated following the GUM (Guide to the Expression of Uncertainty in Measurement, JCGM 100:2008) bottom-up approach. Combined standard uncertainty (( u_c )) is calculated by propagating individual uncertainty components, and expanded uncertainty (( U )) is reported using a coverage factor of ( k = 2 ) (95% confidence level).
6.2 Uncertainty Components
For each method, the following sources are quantified:
- Sampling (( u_{\text{samp}} )): Sub-sampling variability from replicate sample preparations
- Weighing (( u_{\text{wt}} )): Balance calibration and linearity
- Volumetric (( u_{\text{vol}} )): Pipette/volumetric flask calibration, temperature effects
- Instrument (( u_{\text{inst}} )): Calibration curve fitting residuals, detector linearity, drift
- Repeatability (( u_{\text{rep}} )): Within-run standard deviation from validation data
- Reproducibility (( u_{\text{repr}} )): Between-run standard deviation from intermediate precision
- Reference material (( u_{\text{CRM}} )): Uncertainty of certified value of CRM
- Bias (( u_{\text{bias}} )): Standard uncertainty of mean recovery from CRM analysis
6.3 Uncertainty Budgets — Key Parameters
Moisture (Air Oven) — Flaxseed Meal
| Component |
Source |
Value |
Distribution |
( u_i ) |
| Weighing |
Balance (0.1 mg) |
±0.0001 g |
Rectangular |
0.00006 g |
| Sampling |
Sub-sample variation |
SD = 0.036% |
Normal |
0.036% |
| Repeatability |
Validation data |
SD = 0.10% |
Normal |
0.100% |
| Intermediate precision |
Validation data |
SD = 0.12% |
Normal |
0.120% |
| Bias |
CRM recovery (99.7%) |
0.3% bias |
Rectangular |
0.173% |
| Combined (( u_c )) |
|
|
|
0.238% |
| Expanded (( U ), ( k=2 )) |
|
|
|
0.48% |
Protein (Dumas Combustion) — Flaxseed Meal
| Component |
Source |
Value |
Distribution |
( u_i ) |
| Repeatability |
Validation RSD = 1.8% at 36% |
SD = 0.648% |
Normal |
0.648% |
| Intermediate precision |
Validation RSD = 2.2% |
SD = 0.792% |
Normal |
0.792% |
| Bias |
CRM recovery (100.3%) |
0.3% bias |
Rectangular |
0.173% |
| Conversion factor (N×6.25) |
Literature uncertainty |
±0.02 |
Rectangular |
0.19% (rel) |
| Combined (( u_c )) |
|
|
|
1.03% |
| Expanded (( U ), ( k=2 )) |
|
|
|
2.06% |
ALA by GC-FID — Flaxseed Oil
| Component |
Source |
Value |
Distribution |
( u_i ) |
| Repeatability |
Validation RSD = 1.4% at 52% |
SD = 0.728% |
Normal |
0.728% |
| Intermediate precision |
Validation RSD = 1.7% |
SD = 0.884% |
Normal |
0.884% |
| Calibration curve |
Linear regression residual |
SD = 0.42% |
Normal |
0.420% |
| FAME preparation |
Transesterification yield |
±0.5% |
Rectangular |
0.289% |
| Bias |
CRM recovery (100.1%) |
0.1% bias |
Rectangular |
0.058% |
| Combined (( u_c )) |
|
|
|
1.27% |
| Expanded (( U ), ( k=2 )) |
|
|
|
2.54% |
Free Fatty Acids (Titration) — Crude Oil
| Component |
Source |
Value |
Distribution |
( u_i ) |
| Repeatability |
Validation RSD = 1.6% at 1.5% |
SD = 0.024% |
Normal |
0.024% |
| Intermediate precision |
Validation RSD = 2.0% |
SD = 0.030% |
Normal |
0.030% |
| Titrant concentration |
Standardization (4 determinations) |
SD = 0.0002 N |
Normal |
0.001% |
| Titrant volume |
Burette calibration (±0.02 mL) |
0.02 mL |
Rectangular |
0.012% |
| Endpoint detection |
Indicator color change |
±0.01 mL |
Rectangular |
0.006% |
| Combined (( u_c )) |
|
|
|
0.042% |
| Expanded (( U ), ( k=2 )) |
|
|
|
0.084% |
Peroxide Value (Titration) — Refined Oil
| Component |
Source |
Value |
Distribution |
( u_i ) |
| Repeatability |
Validation RSD = 2.5% at 2.0 meq/kg |
SD = 0.050 meq/kg |
Normal |
0.050 |
| Intermediate precision |
Validation RSD = 3.1% |
SD = 0.062 meq/kg |
Normal |
0.062 |
| Sample mass |
Balance (±0.01 g) |
0.01 g |
Rectangular |
0.006 meq/kg |
| Thiosulfate conc. |
Standardization |
SD = 0.0003 N |
Normal |
0.008 meq/kg |
| Blank correction |
Blank titration |
SD = 0.01 mL |
Normal |
0.005 meq/kg |
| Combined (( u_c )) |
|
|
|
0.081 meq/kg |
| Expanded (( U ), ( k=2 )) |
|
|
|
0.16 meq/kg |
7. Shelf Life Validation Protocol
7.1 Scope
Shelf life validation is conducted for all finished product SKUs prior to initial market release and subsequently at intervals not exceeding 5 years, or whenever there is a significant change in formulation, processing, or packaging.
7.2 Protocols by Storage Condition
| Condition |
Temperature |
RH |
Light |
Duration |
Sampling Intervals |
| Real-time Ambient |
25 ± 2 °C |
60 ± 5% RH |
Dark (cardboard outer + opaque inner) |
Target shelf life + 20% (e.g., 15 months for 12-month target) |
T₀, 1, 2, 3, 6, 9, 12, 15 months |
| Real-time Refrigerated |
4 ± 2 °C |
Ambient |
Dark |
Target shelf life + 30% |
T₀, 3, 6, 9, 12, 18, 24 months |
| Accelerated 1 (moderate) |
40 ± 2 °C |
75 ± 5% RH |
Dark |
6 months (correlation factor ≈ 2.5× to ambient) |
T₀, 1, 2, 3, 4, 6 months |
| Accelerated 2 (elevated) |
50 ± 2 °C |
Ambient |
Dark |
3 months (screening only, not used for shelf life claim) |
T₀, 1, 2, 3 months |
| Light stress |
25 ± 2 °C |
60 ± 5% RH |
1200 lux cool-white fluorescent, 12 h on/off cycle |
3 months |
T₀, 1 week, 2 weeks, 1, 2, 3 months |
7.3 Kinetic Modeling
For accelerated conditions, the Arrhenius model is used to estimate reaction rate acceleration factors:
[
k = A \cdot e^{-E_a / (RT)}
]
Where:
- ( k ) = reaction rate constant
- ( E_a ) = activation energy (kJ/mol), estimated from triplicate temperature points
- ( R ) = universal gas constant (8.314 J/mol·K)
- ( T ) = absolute temperature (K)
The Q₁₀ factor (fold-change in rate per 10 °C increase) is calculated for each stability-indicating parameter. A Q₁₀ value between 2.0 and 3.0 is considered typical for lipid oxidation reactions.
7.4 Acceptance Criteria for Shelf Life
The end of shelf life is defined as the time point at which any measured parameter exceeds the following limits:
| Parameter |
Flaxseed Crude Oil |
Flaxseed RBD Oil |
Flaxseed Meal |
| FFA (% as oleic) |
≤ 3.0% |
≤ 0.5% |
— |
| Peroxide value (meq/kg) |
≤ 10.0 |
≤ 5.0 |
— |
| p-Anisidine value |
≤ 20.0 |
≤ 10.0 |
— |
| ALA (% of total FA) |
≥ 48.0% (or ≥ 90% of T₀ value) |
≥ 48.0% (or ≥ 90% of T₀ value) |
— |
| Moisture |
— |
— |
≤ 10.0% |
| Color (Lovibond red, 5¼\" cell) |
≤ 15.0 |
≤ 3.0 |
— |
| Free-flowing (visual) |
— |
— |
No clumps > 2 cm |
| Aerobic plate count (CFU/g) |
≤ 10,000 |
≤ 1,000 |
≤ 100,000 |
| Yeast & Mold (CFU/g) |
≤ 100 |
≤ 10 |
≤ 1,000 |
| Sensory (odor, taste) |
No rancid off-notes (trained panel, n ≥ 3) |
No rancid off-notes |
No musty or sour odor |
7.5 Statistical Analysis
- Shelf life is estimated by linear regression of each parameter vs. time (with 95% confidence bands)
- The lower one-sided 95% confidence limit is used to determine the time at which the parameter crosses the specification limit
- The minimum of all calculated shelf lives across all parameters is declared as the product shelf life
- For accelerated studies, the shelf life estimate is validated against the real-time study at the 12-month time point
8. Stability-Indicating Parameters by Product
8.1 Flaxseed Crude Oil (FLO-01)
| Parameter |
Primary or Secondary Indicator |
Rationale |
| FFA |
Primary |
Direct measure of hydrolytic rancidity; increases with moisture and enzymatic activity |
| Peroxide value |
Primary |
Primary oxidation product (hydroperoxides); most sensitive early indicator |
| p-Anisidine value |
Primary |
Secondary oxidation products (aldehydes); indicates advanced oxidation |
| ALA content |
Primary |
Omega-3 is the key nutritional claim; loss via oxidation must be quantified |
| Color (Lovibond red) |
Secondary |
Browning due to non-enzymatic reactions |
| Tocopherol content |
Secondary |
Natural antioxidant depletion correlates with oxidation progression |
| Sensory (odor) |
Primary |
Consumer-facing attribute; rancid notes correlate with chemical markers |
8.2 Flaxseed RBD Oil (FLO-02)
| Parameter |
Primary or Secondary Indicator |
Rationale |
| Peroxide value |
Primary |
Most sensitive oxidation marker in refined oil (low initial PV) |
| p-Anisidine value |
Primary |
Total oxidation (TOTOX = 2×PV + AnV) provides combined oxidation status |
| FFA |
Primary |
Low initial FFA (< 0.1%); any increase indicates improper refining or hydrolysis |
| ALA content |
Primary |
Nutritional claim integrity; omega-3 retention is critical |
| Color (Lovibond red) |
Secondary |
Color reversion indicates oxidation or bleaching effectiveness |
| Sensory (odor, taste) |
Primary |
Refined oil must remain bland; any off-flavor is a defect |
| Rancimat induction time |
Secondary |
Accelerated stability screening tool |
8.3 Flaxseed Meal (FOM-01)
| Parameter |
Primary or Secondary Indicator |
Rationale |
| Moisture |
Primary |
Drives microbial growth and caking; critical for storage stability |
| Water activity (aw) |
Primary |
< 0.60 aw prevents microbial proliferation |
| Aerobic plate count |
Primary |
Indicator of microbial stability and hygiene |
| Yeast & Mold |
Primary |
Specific spoilage organisms for oilseed meals |
| Free-flowing characteristic |
Primary |
Functional attribute; caking indicates moisture migration |
| Color (Hunter L, a, b) |
Secondary |
Browning indicates Maillard reactions during storage |
| Protein solubility |
Secondary |
Indicator of heat damage during storage (less critical for meal vs. protein concentrate) |
| Peroxide value |
Secondary |
Residual oil in meal (8–12%) can oxidize; meal PV correlates with off-odors |
8.4 Testing Frequency During Shelf Life
| Time Point |
Full QC Panel (all stability parameters) |
Reduced Panel (primary indicators only) |
| T₀ (baseline, 1 week after production) |
✅ |
— |
| 1 month |
— |
✅ |
| 2 months |
— |
✅ |
| 3 months |
✅ |
— |
| 6 months |
✅ |
— |
| 9 months |
— |
✅ |
| 12 months |
✅ |
— |
| 15 months (if applicable) |
✅ |
— |
Document reference: QVAL-001 Rev 2.4
Last reviewed: 2026-06-20
Next review: 2027-06-20