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Tác động của Dimethylsulfoxide (hoặc Diethylsulfoxide) lên sự tương tác giữa Methylene Blue và DNA tuyến ức bò trong các dung dịch nước bằng cách sử dụng phân cực huỳnh quang và giảm huỳnh quang trạng thái ổn định
Tóm tắt
Nghiên cứu chi tiết về tác động của dimethylsulfoxide (hoặc diethylsulfoxide) lên sự tương tác giữa methylene blue (MB) và DNA tuyến ức bò đã được thực hiện ở nhiệt độ 293,15 K, sử dụng phương pháp giảm huỳnh quang trạng thái ổn định và phân cực huỳnh quang. Sự kết hợp giữa giảm huỳnh quang trạng thái ổn định và phân cực huỳnh quang tiết lộ các kiểu gắn kết chính tại các nồng độ DNA khác nhau và ảnh hưởng của sulfoxides lên cơ chế gắn kết. Để so sánh, các dung môi phân cực khác như N,N-dimethyl formamide và acetonitrile cũng được sử dụng. Từ phương trình Stern–Volmer, các giá trị của hằng số gắn kết và sự thay đổi năng lượng tự do Gibbs chuẩn đã được xác định. Tại nồng độ DNA thấp với sự bổ sung của nhiều dung môi đồng phân hữu cơ khác nhau, hằng số gắn kết của phức hợp DNA–MB giảm cho thấy rằng các liên kết hydro là chủ yếu, do đó, kiểu gắn kết chính là gắn kết qua rãnh. Tại nồng độ DNA cao, cơ chế gắn kết thay đổi và sự xen kẽ trở thành kiểu gắn kết chính trong tất cả các dung dịch. Việc bổ sung các dung môi đồng phân làm biến dạng gắn kết qua rãnh và, dẫn đến, làm suy yếu sự xen kẽ giữa MB và các cặp base của DNA dạng sợi đôi.
Từ khóa
#dimethylsulfoxide #diethylsulfoxide #methylene blue #DNA #huỳnh quang #gắn kết #cơ chế gắn kếtTài liệu tham khảo
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