There are some alternative methods that can be used depending on the type and amount of solvent, the nature and quantity of the extract, the equipment available, and the desired outcome. Some of these methods are:

Speed vacuum concentrator: This is a device that uses a combination of centrifugal force, vacuum, and heat to evaporate solvents from samples in tubes or vials. It is faster and more efficient than rotary evaporation, and can handle small volumes of solvent and extract. It is suitable for solvents with low boiling points, such as methanol.

Magnetic stirrer and hot plate: This is a simple method that involves placing the solution in a porcelain capsule or a glass flask, and stirring it with a magnetic stir bar while heating it gently on a hot plate. The solvent will gradually evaporate and leave behind the extract. This method is suitable for solvents with moderate boiling points, such as ethanol. However, it requires careful monitoring to avoid overheating or burning the extract, especially when the solution becomes thick or dry.

Side-arm flask and vacuum pump: This is a method that uses a reduced pressure to lower the boiling point of the solvent and speed up the evaporation process. The solution is placed in a side-arm flask that is connected to a vacuum pump and a cold trap. The flask is heated on a water bath or a hot plate, and the solvent vapors are collected in the cold trap. This method is suitable for solvents with high boiling points, such as water. However, it requires a good seal between the flask and the pump, and a proper choice of vacuum level and temperature to avoid bumping or foaming of the solution.

Thank you so much Moiching Ahamed