Tác dụng của chiếu xạ chùm điện tử đến một số đặc tính của xanthan định hướng ứng dụng cho sản xuất phân bón lá=Effect of electron beam irradiation on some characteristics of xanthan with emphasis on application in foliar fertiliser production

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Tác giả: Văn Bính Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học và Công nghệ Việt Nam, 2025

Mô tả vật lý: tr.20-24

Bộ sưu tập: Metadata

ID: 478422

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Irradiation-induced chain scission is known as a useful tool for degrading polysaccharides into smaller-sized and lower-molecular-weight fragments or even producing oligo-saccharides that have improved bioactivities. This study aimed to investigate the properties of radiation-degraded xanthan for further application in the production of foliar fertiliser. The xanthan solutions of 2% were electron beam (EB) irradiated at 10, 20, 30, and 50 kGy doses, with dose rates of 1.5, 3.5, and 7.5 kGy/s. The study parameters include the effects of irradiation dose and dose rate on certain properties of xanthan in solution. Results showed the viscosity and molecular weight of xanthan significantly decreased with the increases in radiation dose and dose rate. EB irradiation seemed not to introduce the changes in the xanthan structure, though UV-Vis and FT-IR spectra both revealed the absorption peaks corresponding to the carbonyl group increased with radiation dose due to the formation of C=O double bonds during radiation degradation. The resulting degraded xanthan fragments showed higher mobilities for crystallisation, so their crystallinity degree and melting temperature also increased.Xử lý chiếu xạ cắt mạch đã được biết đến là một công cụ hiệu quả để phân hủy các polysaccharide thành các phân đoạn có kích thước và khối lượng phân tử nhỏ hơn, hay thậm chí tạo oligo-saccharide với hoạt tính sinh học cải thiện. Mục đích của nghiên cứu này nhằm xác định một số đặc tính của xanthan chiếu xạ hướng tới ứng dụng cho sản xuất phân bón lá. Dung dịch xanthan 2% đã được chiếu xạ bằng chùm điện tử (EB) với các liều 10, 20, 30 và 50 kGy, suất liều 1,5
3,5 và 7,5 kGy/s. Các thông số nghiên cứu bao gồm ảnh hưởng của liều chiếu, suất liều đến một số đặc tính của xanthan ở trạng thái dung dịch. Kết quả chỉ ra rằng, độ nhớt và khối lượng phân tử của xanthan giảm khi tăng liều xạ và suất liều. Chiếu xạ EB không làm thay đổi cấu trúc của xanthan, dù phổ hấp thụ phân tử (UV-Vis) và máy quang phổ hồng ngoại biến đổi Fourier (FT-IR) đều cho thấy đỉnh hấp thụ ứng với nhóm carbonyl tăng lên do quá trình cắt mạch làm hình thành các liên kết đôi C=O trong phân tử. Các phân đoạn xanthan cắt mạch hình thành có độ linh động cao hơn, do đó độ kết tinh và nhiệt độ nóng chảy của xanthan chiếu xạ cũng cao hơn.

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