American Journal of Food Technology1557-45711557-458XAcademic Journals Inc.10.3923/ajft.2008.224.234Ipomoea batatas)]]>YangJ. GadiR.L. 4200834Purple-Fleshed Sweet Potatoes (PFSP) (Ipomoea batatas)
are rich sources of acylated anthocyanins. Anthocyanin content, antioxidant
activity and total phenols as well as color characteristics of PFSP were
determined by UV/visible or fluorescence spectrophotometry and chromametry.
The flesh of PFSP cultivar Terlaje produced in the Western Pacific contained
total anthocyanins at 0.40 mg g-1 fresh weight. PFSP Powders
processed by directly freeze-drying or first steaming and then freeze-
or hot air-drying contained anthocyanins at 0.94-0.97 mg g-1,
Oxygen Radical Absorbance Capacity (ORAC) at 70.0-93.0 μmole Trolox
g-1, Trolox Equivalent Antioxidant Capacity (TEAC) at 11.8-12.7
μmole Trolox g-1 and total phenols at 4-5 mg gallic acid
g-1 dry weight. PFSP powder processed by hot air-drying without
steaming lost 65% of anthocyanin content, 35% of antioxidant activity
and 40% of total phenols. Steaming of PFSP roots at atmosphere pressure
for 0.5 h increased 40% of anthocyanin content and enhanced the purple
color of PFSP. Dehydration at 60°C for 24 h retained anthocyanin content
and purple color of steamed PFSP. Both steaming and dehydration increased
the percentage of polymeric anthocyanins in PFSP. The results suggested
the PFSP powders exhibited potentials as colorants and neutraceutical
ingredients for formulated foods.]]>Cai, Y., Q. Luo, M. Sun and H. Corke,20047421572184Cao, G. and R.L. Prior,19992995062Clifford, M.,20008010631072Collins, J.L. and P. Pangloli,199762622625Dyrby, M., N. Westergaard and H. Stapelfeldt,200172431437Fossen, T., L. Cabrita and O.M. Andersen,199863435440Furuta, S., I. Suda, Y. Nishiba and O. Yamakawa,199843335Garzon, G.A. and R.E. Wrolstad,200175185196Giusti, M.M. and R.E. Wrolstad, 20012001pp: 19-31pp: 19-31Giusti, M.M. and R.E. Wrolstad,200314217225Goda, Y., T. Shimizu, Y. Kato, M. Nakatani and T. Maitani et al.,199744183186Hagiwara, A., H. Yoshino, T. Ichihara, M. Kawabe and S. Tamano et al.,2002275768Harada, K., M. Kano, T. Takayanagi, O. Yamakawa and F. Ishikawa,2004Ipomoea batatas purple sweet potato tuber.]]>6815001507Harborne, J.B.,1958702228Huang, D., B. Ou, M. Hampsch-woodill, J. Flanagan and R. Prior,20025044274444Huang, Y.C., Y.H. Chang and Y.Y. Shao,200698529538Kano, M., T. Takayanagi, K. Harada, K. Makino and F. Ishikawa,2005Ipomoera batatas cultivar Ayamurasaki.]]>69979988Manlan, M., R.F. Matthews, R.P. Bates and S.K. O'hair, 198550764768Oki, T., M. Masuda, S. Furuta, Y, Nishiba, N. Terahara and I. Suda,20026717521756Miyazaki, T., W. Tsuzuki and T. Suzuki,199160217224Odake, K., N. Terahara, N. Saito, K. Toki and T. Honda,1992Ipomoea batatas.]]>3121272130Oki, T., M. Osame, M. Masuda, M. Kobayashi and S. Furuta et al .,200353101107Oki, T., I. Suda, N. Terahara, M. Sato and M. Hatakeyama,20067025402543Re, R., N. Pellegrini, A. Proteggente, A. Pannala, M. Yang and C. Rice-Evans,19992612311237Redus, M., D.C. Baker and D.K. Dougall,19994734493454Shi, Z., I.A. Bassa, S.L. Gabriel and F.J. Francis,1992Ipomoea batatas.]]>57755757Singleton, V.L., R. Orthofer and R.M. Lamuela-Raventos,19991999pp: 152-178pp: 152-178Slinkard, K. and V.L. Singleton,1977284955SPSS,20032003Suda, I., T. Oki, M. Masuda, Y. Nishiba, S. Furuta, K. Matshgano, K. Sugita and N. Terahara,20025016721676Suda, I., T. Oki, M. Masuda, M. Kobayashi, Y. Nishiba and S. Furuta,200337167173Teow, C.C., V.D. Truong, R.F. McFeeters, R.L. Thompson, K.V. Pecota and G.C. Yencho,2007103829838Terahara, N., T. Shimizu, Y. Kato, M. Nakatani, T. Maitani, M. Yamaguchi and Y. Goda,1999Ipomoea batatas.]]>6314201424Tsukui, A., T. Suzuki, Y. Kato, M. Nakatani, T. Maitani, M. Yamaguchi and Y. Goda,1999Ipomaea batatas poir.]]>46148154Wrolstad, R.E., R.W. Durst and J. Lee,200516423428Ramesh-Yadav, A., M. Guha, R.N. Tharanathan and R.S. Tharanathan,2006392026Yamakawa, O.,199875284287Yoshimoto, M., S. Okuno, T. Kumagai, M. Yoshinaga and O. Yamakawa,199933143148Yoshimoto, M., S. Okuno, M. Yamaguchi and O. Yamakawa,20016516521655Yoshinaga, M., M. Nakatani and O. Yamakawa,199875186188Yoshimoto, M., S. Okuno, M. Yoshinaga, O. Yamakawa, M. Yamaguchi and J. Yamada,1999Ipomoea batatas) roots.]]>63537541Bridle, P. and C.F. Timberlake,199758103109