NGUYEN VS, LE LHD. OPTIMIZATION AND VALIDATION OF METHOD FOR DETERMINATION OF NATTOKINASE ACTIVITY IN DIETARY SUPPLEMENTS BY ULTRAVIOLET SPECTROPHOTOMETRY. Tạp chí Dinh dưỡng và Thực phẩm [Internet]. 2025 Oct. 28 [cited 2025 Nov. 7];21(5):112-21. Available from: https://tapchidinhduongthucpham.org.vn/index.php/jfns/article/view/953