Reports that studied long-term stability of AgNPs.

Source of AgNPs synthesis	Size range (nm)	Storage conditions	Stability	Periodic evaluation	Main physicochemical method used	Application	Periodic application evaluation	Ref.
Cassia roxburghii DC (leaf aqueous extract)	10–30	Dark, room temperature	12 months	Yes	UV-vis	Antifungal	No	1
LASER ablation	10–70	Both light and dark, room temperature and 4 °C (only dark)	13.5 months	No (only initial and final measurements)	STEM coupled with EDX spectroscopy and mapping	Antibacterial	Yes (every 14 and 45 days)	18
Parachlorella kessleri (whole aqueous extract)	5–30	Both light and dark, room temperature and 5 °C (only dark)	6.6 months	Yes	UV-vis and TEM (size analysis)	No	No	27
Chemical reduction of AgNO3 with NaBH4 in the presence of Na3C6H5O7	2–10	Dark, room temperature and 4 °C	12 months	No (only initial and final measurements)	UV-vis and TEM (size analysis)	No	No	21
Chemical reduction of AgNO3 with NaBH4 in the presence of different stabilizing agents	Not disclosed	Both light and dark, room temperature and 4 °C (only dark)	6 months	No (only initial and final measurements)	UV-vis, zeta potential, ICP-MS, DLS, XRD and TEM (size analysis)	Cytotoxic studies	No (only initial and final measurements)	19
Chemical reduction of AgNO3 with NaBH4 in the presence of different stabilizing agents	Not disclosed	Dark, room temperature	6 months	No (only initial and final measurements)	UV-vis, zeta potential and DLS	Detection of Mn2+ ions	No	28
Annona muricata (ethanoic extract)	2–500	Dark, room temperature and cold storage (4, −20 and −80 °C)	3 months	No (only final)	UV-vis	No	No	29
Derris trifoliata seeds (aqueous extract)	Not disclosed	Dark, room temperature	>3 months	No	Not disclosed	Antioxidant, antibacterial and antiproliferative	No	30
Juglans regia (aqueous extract)	Not disclosed	Dark, room temperature and 4 °C	6 months	No	Not disclosed	Antioxidant, antimicrobial, cytotoxicity	No	31
Chemical reduction using pectin	8–28	Dark, 4 °C	5 months	Yes	UV-vis	Antibacterial	No	32
Sargassum angustifolium aqueous extract along with chitosan	5–20	Dark room temperature	6 months	No (only initial and final measurements)	UV-vis	Antibacterial	No	33