In fact, it is precisely because of this characteristic of injection that it has many special requirements for quality control than other drugs. According to these requirements, we can really explain "why juice can't be used for intravenous injection".
Why can't fruit juice be used for intravenous injection?
First of all, the "clarity" of solution-type injections should be checked: this means that they should be clear and there should be no turbidity or foreign matter visible to the naked eye. Although suspension injection is also available, it cannot be used in vein or spinal canal. This is because if insoluble particles enter the human body, larger particles will block capillaries to form thrombus, and if they invade lung, brain, kidney and other tissues, they will also form embolism; If it is in the blood, it will be surrounded by immune cells, and granulation will be formed with the proliferation of cells, causing various hazards.
However, there are various insoluble solids in fruit juice, such as cellulose, broken plant cell walls and pectin. Although Auntie in the news "made a simple filtration", the use of gauze or ordinary filter paper and other "household filtration equipment" obviously failed to meet the requirements of "the number of insoluble particles of 10 micron and above is below 10~20, and the number of particles of 25 micron and above is below 2~5" in China Pharmacopoeia.
Secondly, because intravenous drugs will be directly mixed with blood, it is not enough to clarify the solution, and it must be a solution with similar properties to plasma. For example, it needs to be equal to or close to the osmotic pressure of plasma and equal to the tension of erythrocyte membrane. If the solution is too thick, it will make blood cells or surrounding tissue cells lose water (think of cured meat here), and if it is too thin, it will make the cells absorb water and expand until they burst.
The commonly used isotonic solution for injection is 0.9% sodium chloride solution or 5% glucose solution, but I'm afraid it is impossible to accurately measure the concentration by adding more or less bowl of water when squeezing juice. In addition, the injection should be equivalent to the pH value of blood (about 7.4), so as to avoid too much influence on the acid-base balance in the body and avoid stimulation. However, fruits often contain a variety of rich organic acids, and the pH value of juice of some fruits (such as lemons) can even reach 2~3, which obviously deviates too much.