College of Food Science and Technology, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Products Processing and Safety, Key Laboratory of Advanced Processing of Aquatic Products of Guangdong Higher Education Institution, 524088, Zhanjiang, P.R. China.
School of Chemistry and Chemical Engineering, Lingnan Normal University, 524048, Zhanjiang, P.R. China.
Sci Rep. 2019 May 27;9(1):7853. doi: 10.1038/s41598-019-44337-6.
Ash of Antarctic krill integument (AAKI) was prepared by sintering the integument at 550°C under air atmosphere for 4 hours, and its composition was analyzed by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR) and electron dispersive spectroscopy (EDS). XRD results showed that the major phase in AAKI was ascribed to apatite. Besides, it was noticed that the (300) peak of AAKI shifted to 33.07°, which was coincident with that of fluorapatite (FA). The FTIR results confirmed the presence of phosphate ions, and the absence of -OH. The EDS results confirmed the presence of Ca, P, O and F elements in the ash sample. The content of FA in the ash was determined to be 50.4%, and the proportion of fluorine in the form of FA to the total fluorine in the integument was 40.5%. Based on the XRD, FTIR and EDS results, it can be concluded that FA was the main form of fluoride in the integument of Antarctic krill.
南极磷虾外壳的灰分（AAKI）是通过在空气气氛中于 550°C 下烧结外壳 4 小时制备的，并通过 X 射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和电子能谱（EDS）分析其成分。XRD 结果表明，AAKI 的主要相归因于磷灰石。此外，还注意到 AAKI 的（300）峰向 33.07°偏移，这与氟磷灰石（FA）的峰重合。FTIR 结果证实了磷酸根离子的存在，而不存在-OH。EDS 结果证实了灰分样品中存在 Ca、P、O 和 F 元素。灰分中 FA 的含量被确定为 50.4%，并且 FA 形式的氟在磷虾外壳中的氟总量中的比例为 40.5%。基于 XRD、FTIR 和 EDS 结果，可以得出结论，FA 是南极磷虾外壳中氟化物的主要形式。
