Vitamin C is also called L- ascorbic acid. It is soluble in water, less soluble in ethanol, insoluble in chloroform, benzene, ether, petroleum ether, oil and other organic solvents, with acidity and reducing, there are four isomers, namely L-ascorbic acid, D-ascorbic acid, L-isoascorbic acid, D-isoascorbic acid.
Fruits and vegetables are rich in vitamin C, the main form of existence is L-ascorbic acid, its strongest efficacy, that is, commonly referred to as ascorbic acid. Under certain conditions, ascorbic acid can be oxidized to produce dehydroascorbic acid, L-dehydroascorbic acid can also be reduced in organisms, into L-ascorbic acid, this change is reversible, so L-dehydroascorbic acid still has biological activity. However, the activity of dehydroascorbic acid disappears when it is further oxidized to diketoglobituric acid, which is irreversible.
Test Items | Test Parameters | Test Result |
Appearance | White or almost white crystals crystalline powder | Complies |
Identification | Positive reaction | Positive |
Metling Point(℃) | About 190 | 191.0 |
PH(5%,W/V) | 2.1~2.6 | 2.41 |
PH(2%,W/V) | 2.4~2.8 | 2.42 |
Loss on Drying(%) | ≤0.4 | 0.07 |
Cd(ppm) | ≤1 | <1 |
Arsenic(ppm) | ≤3 | <3 |
Lead(ppm) | ≤2 | <2 |
Copper(ppm) | ≤5 | <5 |
Heavy Metals(ppm) | ≤10 | <10 |
Iron(ppm) | ≤2 | <2 |
Mercury(ppm) | ≤1 | <1 |
Mesh | 40~80 | Complies |
Oxalic Acid(%) | ≤0.2 | <0.2 |
Sulphate Ash(Residue on Ignition)(%) | ≤0.1 | <0.1 |
Specific Optical Rotation | +20.5◦~+21.5◦ | +20.81◦ |
Residual Solvents(ppm) | Methanol:NMT3000 | <3000 |
Assay(%) | 99.0~100.5 | 99.71 |
Conclusion: | Conform to BP2008/USP31/E300/FCCV. |
- Payment term: T/T 30% in advance and T/T 70% against copy of B/L. or 100% L/C at sight.
- Shipment time: Within 3 weeks after confirming order.
- We take photos of every stage of the process and can send them to you. Before we ship the container, you will have photos and lab test results.
Provide quality after-sale service once the container is received.
In case the product is damaged, we will refund you or resend a new packaging.
Also, if the goods are not as per your specification, we will callback the container at our cost, or compensate you as per our agreement.
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