Nurdjanah, Siti and Yuliana, Neti and Astuti, Sussi and Zukryandry, Zykryandry and Hernanto, jeri (2017) Physico Chemical, Antioxidant and Pasting Properties of Pre-Heated Purple Sweet Potato Flour. Journal of Food and Nutrition Sciences, 5 (4). pp. 140-146. ISSN 2330-7285 (Print) 2330-7293 (Online)

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Abstract

Purple sweet potatoes contain anthocyanins which could function as a natural food colorant, and an antioxidant. One of the problems in handling the fresh roots is their susceptibility during storage, and to extend their uses, fresh purple sweet potato could be processed into flour. However, during flouring process, the properties of the purple sweet potato may undergo some changes such as partial gelatinization of the starch and discolorization. Therefore, the purpose of this study was to investigate the effect of pre-heating treatment during flouring process on degree of gelatinization, the anthocyanin content , the antioxidant activity and the total phenolic content of heat treated purple sweet potato flour. Other objectives were to observed the changes in the starch properties such as rheological properties, granular appearance of the heat treated- purple sweet potato flour. Pre-heating treatment of purple sweet potato flour was prepared by heating grated purple sweet potato in a single rotary drum cooker at 90°C for 15, 30, 45, 60 and 75 min, followed by drying in a cabinet dryer at 60 °C for 8 h. The results showed the longer pre-heating time at 90°C had caused increase in the degree of gelatinization, in total phenolic and anthocyanin retention. In addition, differences in gelatinization temperature, maximum viscosity, paste stability and retrogradation, and differences in scanning electron microscope (SEM) of granular appearance were also observed. The overall results indicated that pre-heating treatment can be used for modifying the physical , chemical and rheological properties to suit various applications and preserving functional properties of purple sweet potato flour.

Item Type:	Article
Subjects:	S Agriculture > S Agriculture (General)
Divisions:	Fakultas Pertanian (FP) > Prodi Teknologi Hasil Pertanian
Depositing User:	Siti Nurdjanah
Date Deposited:	12 Jun 2017 02:47
Last Modified:	12 Jun 2017 02:47
URI:	http://repository.lppm.unila.ac.id/id/eprint/3292

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