Property and equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property and equipment
Property and equipment, at cost	$ 138,484	$ 45,391
Less accumulated depreciation and amortization	(50,122)	(43,070)
Property and equipment-net	88,362	2,321
Depreciation expense	7,052	4,403	$ 12,829
Lab equipment
Property and equipment
Property and equipment, at cost	133,226	40,133
Computer equipment
Property and equipment
Property and equipment, at cost	$ 5,258	$ 5,258