The effect of fermentation process on physical and chemical characteristics of pitaya (Hylocereus polyrhiuzus [F.A.C. Weber] Britton & Rose) stem flour

2nd International Conference on Natural Resources and Life Sciences

生态环境科学

Soedjatmiko, H.^1 ; Chrisnasari, R.^2 ; Hardjo, P.H.^1

Magister of Biotechnology, Faculty of Biotechnology, University of Surabaya, Jalan Raya Kalirungkut, Surabaya, East Java

60293, Indonesia^1

Department of Biology, Faculty of Biotechnology, University of Surabaya, Jalan Raya Kalirungkut, Surabaya, East Java

60293, Indonesia^2

关键词: Anti-bacterial activity;    Fermentation conditions;    Fermented flour;    Incubation time;    Inoculum concentrations;    Insoluble fibers;    Physical and chemical characteristics;    Soluble fiber;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/293/1/012020/pdf
DOI  :  10.1088/1755-1315/293/1/012020

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Research interest on fiber has increased rapidly in the last decade due to its complexity and functional properties towards the human body. In this research group, pitaya (Hylocereus polyrhiuzus [F.A.C. Weber] Britton & Rose) stem flour is a promising candidate as new food resources since it contains a high amount of fiber and vitamin C as well as demonstrates both antioxidant and antibacterial activities. However, this pitaya stem flour has very low solubility in water that makes its application in food product very limited. In this study, pitaya stem flour has been fermented by Trichoderma reesei in a variation of inoculum concentration (3 % and 5 %) and fermentation time (24 to 60 h). The fermentation processes reduce the ash and water content of the flour, increase the soluble fiber content as well as its solubility. During the fermentation, the colour of the flour has changed. It becomes brighter and brownish. The best fermentation condition marked by its highest soluble fiber content is achieved by 3 % (w/v) of T. reesei inoculum with 60 h incubation time.