Choo K. Y., . and Kho C., . and Ong Y. Y., . and Thoo Y. Y., . and Lim L. H., . and Tan C. P., . and Ho C. W., . Fermentation of red dragon fruit (Hylocereus polyrhizus) for betalains concentration. pp. 2539-2546. ISSN 2231-7546