Dear Dr Faida

Please try to 1- sonicate your sample for complete dissolution

2- try spray drying or lyophilization

3- If the solvent is Ethanol or ... It can be easily done as solvent such as ethanol you can use different drying method

You could dry them in an oven at 40°C to avoid the degradation of thermolabile phytochemicals.

It is better to use a freeze dryer apparatus for a limited time (less than seventy-two hours). For more times, your sample must be sonicated. Then, the further optional treatments could be done on it, subsequently.

As many said, lyophilisation is good. However, it can be dried in a ventilated oven at 40°C for 12 to 48 h if the extract is not having enough lessential oils components

Hi Fiada

Aqueous extract can be dried byadding n-butanol to form azeotrope that be distilled at 70. Also you may use lypholiser.

Best Regards

Ghada