Lutein is extracted from marigold flowers, which is a natural carotenoid and the essential pigment that exists in the macular area of the retina of the human eye. However, the stability of lutein is a factor that affects product quality. It is mainly affected by factors such as oxygen, light, heat, metal ions, and pH. For example, the heat treatment process can cause the isomerization reaction of lutein to produce 9-cis Formula and 13-cis-Lutein. Therefore, when storing, the pure lutein crystals or lutein powder should be vacuumed, protected from light, and stored at low temperatures.
The stability test of lutein is recorded by the KS R&D. After the test is qualified and stored, the stability test samples are taken according to the sample sampling standard procedure, and the results are registered and saved after the test and analysis, which is used as the stability data evaluation in accordance with.
Stability data evaluation and conclusions
The expiration date and storage conditions of the product are judged based on the appearance, content, and loss of drying of the product. The test data is given in the form of tables and diagrams, so as to effectively evaluate the stability of lutein.
Stability data of marigold flower extract lutein powder as follows:
Data of Sample 1
0 month | 3 months | 6 months | 9 months | 12 months | 18 months | 24 months | |
Testing Date | 2019.9.12 | 2019.12.12 | 2020.3.12 | 2020.6.12 | 2020.9.12 | 2021.3.12 | 2021.9.12 |
Appearance | Orange yellow powder | Orange yellow powder | Orange yellow powder | Orange yellow powder | Orange yellow powder | Orange yellow powder | Orange yellow powder |
Assay | 5.25% | 5.23% | 5.23% | 5.23% | 5.20% | 5.19% | 5.16% |
Degradation rate | 0% | 0.38% | 0.38% | 0.38% | 0.95% | 1.14% | 1.71% |
Loss on drying | 4.28% | 4.29% | 4.29% | 4.32% | 4.33% | 4.32% | 4.33% |
Conclusion | Complies | Complies | Complies | Complies | Complies | Complies | Complies |
Data of Sample 2
0 month | 3 months | 6 months | 9 months | 12 months | 18 months | 24 months | |
Testing Date | 2019.10.12 | 2020.1.12 | 2020.4.12 | 2020.7.12 | 2020.10.12 | 2021.4.12 | 2021.10.12 |
Appearance | Orange yellow powder | Orange yellow powder | Orange yellow powder | Orange yellow powder | Orange yellow powder | Orange yellow powder | Orange yellow powder |
Assay | 5.33% | 5.32% | 5.32% | 5.30% | 5.28% | 5.28% | 5.25% |
Degradation rate | 0% | 0.19% | 0.19% | 0.56% | 0.94% | 0.94% | 1.50% |
Loss on drying | 4.52% | 4.55% | 4.53% | 4.56% | 4.54% | 4.58% | 4.62% |
Conclusion | Complies | Complies | Complies | Complies | Complies | Complies | Complies |
Data of Sample 3
0 month | 3 months | 6 months | 9 months | 12 months | 18 months | 24 months | |
Testing Date | 2019.11.12 | 2020.2.12 | 2020.5.12 | 2020.8.12 | 2020.11.12 | 2021.5.12 | 2021.11.12 |
Appearance | Orange yellow powder | Orange yellow powder | Orange yellow powder | Orange yellow powder | Orange yellow powder | Orange yellow powder | Orange yellow powder |
Assay | 5.21% | 5.20% | 5.18% | 5.18% | 5.16% | 5.14% | 5.11% |
Degradation rate | 0% | 0.19% | 0.58% | 0.58% | 0.96% | 1.34% | 1.92% |
Loss on drying | 4.12% | 4.15% | 4.13% | 4.18% | 4.25% | 4.26% | 4.28% |
Conclusion | Complies | Complies | Complies | Complies | Complies | Complies | Complies |
Conclusion: Three batches of lutein have been proved by long-term experiments (which can be obtained from the above experimental data). After 24 months of observation and testing, the appearance of the marigold flower extract lutein powder has not changed, and the maximum content degradation rate is 1.92%. There is a little chance of loss on drying. It is confirmed that the product has had good stability for 24 months under the above storage conditions.
KS is a professional and experienced manufacturer of Marigold extract for 15 years, holding on ISO, HACCP, KOSHER, owing R&D department and US warehouses. As a manufacturer, we hope this article about the Stability of Lutein powder is helpful for you. Also here is our inventory list of Lutein powder in the US warehouses, pls feel free to check it!
