Preliminary Study on the Synthesis of Phosphorylated Mung Bean Starch: The Effect of pH on the Physicochemical and Functional Properties

Illona Nathania; Asaf Kleopas Sugih; Henky Muljana

doi:10.22146/ijc.25150

Preliminary Study on the Synthesis of Phosphorylated Mung Bean Starch: The Effect of pH on the Physicochemical and Functional Properties

https://doi.org/10.22146/ijc.25150

Illona Nathania^(1*), Asaf Kleopas Sugih⁽²⁾, Henky Muljana⁽³⁾

(1) Department of Chemical Engineering, Parahyangan Catholic University, Jl. Ciumbuleuit 94, Bandung 40141, Indonesia
(2) Department of Chemical Engineering, Parahyangan Catholic University, Jl. Ciumbuleuit 94, Bandung 40141, Indonesia
(3) Department of Chemical Engineering, Parahyangan Catholic University, Jl. Ciumbuleuit 94, Bandung 40141, Indonesia
(*) Corresponding Author

Abstract

Mung bean (Vigna radiate L.) is a grain legume widely cultivated in tropical and sub-tropical regions. Mung bean seeds contain a significant amount of carbohydrate (63%-w/w) and are easily digested compared to seeds from other legumes. Mung bean starch has the potential to be used as thickener or gelling agents in food industries. Certain functional properties of mung bean starch, however, still need to be improved. In this research, a preliminary study was performed to upgrade mung bean starch properties using phosphorylation reaction. In particular, the effect of starch suspension pH (6–10) on the functional properties of the modified products was investigated. Phosphorylation was carried out at 130 °C, for 2 h using sodium tripolyphosphate (STPP) with an intake of 5%-w based on dry starch. The phosphorylated products were subsequently washed with water and dried. The experimental results show that the P-content of the phosphorylated mung bean starch is accessible in the range of 0.04–0.08%. The solubility (6.09–11.37%-w/w) and swelling power (9.88–11.17 g/g) of the modified starch products have been improved compared to native starch (solubility = 6.06 %-w/w, swelling power = 8.05 g/g). Phosphorylation also proved to increase peak viscosity, paste clarity, and water absorption/oil absorption capacity of the products.

Keywords

modified starch; mung bean; phosphorylation; starch

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DOI: https://doi.org/10.22146/ijc.25150