@article{he_li_lv_he_2015,  title={Composition and color stability of anthocyanin-based extract from purple sweet potato},  volume={35},  ISSN={0101-2061},  url={https://doi.org/10.1590/1678-457X.6687},  DOI={10.1590/1678-457X.6687},  number={3},  journal={Food Science and Technology},  publisher={Sociedade Brasileira de Ciência e Tecnologia de Alimentos},  author={He, Xiu-li and Li, Xue-li and Lv, Yuan-ping and He, Qiang},  year={2015},  month={Jul},  pages={468–473} }