The powdered crude plant extract could be stored at 4'C for how long? Could this be for 5-10 years? Are they any special precautions that I should be aware of in storing the extract?
I shall give an answer based on our experience in the chemistry department. The administration ordered us to present a scientific exhibition for the public every 3 years. The Soxhlet extraction was always displayed since 1993. We did extracts from mint, thyme, anise seeds, cloves...etc. We usually find the previous extracts unsuitable after 3 years of ordinary storage (e.g. change in color, diminishing odors) so we have to prepare fresh samples.
Ms. Nurul Adhwa HAR
Similar questions were asked by other RG friends. Check the posts in these threads. I am little perplexed, why do you want to store powdered extract for 5-10 years?
Best wishes
https://www.researchgate.net/post/Which_do_you_recommend_fresh_or_semi-dry_or_dry_biomass_tissue_for_an_aqueous_solvent_extract_or_for_extracting_isolating_separating_phytochemicals
https://www.researchgate.net/post/What_is_the_effect_of_time_period_on_the_medicinal_value_of_a_herb
https://www.researchgate.net/post/After_drying_the_sample_how_long_can_it_be_stored_before_it_will_be_extracted
https://www.researchgate.net/post/How_long_can_I_keep_a_plant_extract_in_the_refrigerator_or_freezer_at-20_C
I shall give an answer based on our experience in the chemistry department. The administration ordered us to present a scientific exhibition for the public every 3 years. The Soxhlet extraction was always displayed since 1993. We did extracts from mint, thyme, anise seeds, cloves...etc. We usually find the previous extracts unsuitable after 3 years of ordinary storage (e.g. change in color, diminishing odors) so we have to prepare fresh samples.
Dear Dr. Nizar
Very interesting post. How long were you able to store these spices extracts without physico-chemical quality deterioration? What do you mean by ordinary storage?-Under ambient conditions? In what kind of containers? Some of the essential oils have short shelf lives under ambient conditions, but when stored under refrigeration their shelf lives can be extended.
Check this thread and link:
https://www.researchgate.net/post/What_are_the_best_methods_to_store_the_plant_samples_for_long_use?_tpcectx=profile_answers
http://www.slideshare.net/rahulbs89/extraction-of-plant-contituents
Dear Dr. B.R. Rajeswara Rao,
Sorry for not seeing your questions before this moment. My colleagues (the technicians) usually store the oily plant extracts in stoppered large transparent glass test tubes under ambient conditions. I know that this way of storage is bound to have an adverse effect on the extracts but the lab fridge is "booked" for many more sensetive chemicals.
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