The firm is understood to have picked up between 11 per cent and 19 per cent of the company according to a Deal Journal source.
Xiamen-based Triplex has a registered capital of $35.2m according to its website, which says it performs R&D, manufacture and sales for medical diagnostics reagents, instruments, diagnostics and health check services.
RRJ is currently planning one of the biggest-ever Asia-focused investment vehicles by targeting a $5bn fundraise less than a year after closing its maiden fund.
The firm is believed to have already received more than $3bn of commitments from investors and is expected to complete a first close in September.
Such a fundraise would dwarf the $2.3bn RRJ raised for its RRJ Capital Master Fund I in 2011, which closed $300m over target exactly 12 months ago.
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