agriTECH
Vol 29, No 4 (2009)

Isothermal Crystallization Properties of Rbd-Palm Oil as Measured By Dsc and Oscillatory Rheometry

Bangun P. Nusantoro (Department of Food and Agricultural Product Technology, Faculty of Agricultural Technology, Gadjah Mada University, Jl. Flora, Bulaksumur, Yogyakarta 55281)



Article Info

Publish Date
15 May 2012

Abstract

In this research, the crystallization properties of refined bleached and deodorized (RBD) palm oil under isothermal conditions were investigated. A good quality of RBD palm oil (showed by IV, FFA content, PV, and AV with the values of 52.14, 0.06%, 1.39 meq/kg, and 0.88, respectively) was used in this research. In general, RBD palm oil demonstrat­ ed a two­step crystallization process at the isothermal crystallization temperatures/  of 18oC, 20oC and 22oC. From differential scanning calorimetry (DSC) measurement of RBD palm oil, the melting heats/showed decrement values (33.84 J/g, 26.83 J/g and 22.47 J/g) but the peaks of the corresponding endotherm/ showed increment values (33.52oC, 34.72oC and 36.44oC) when both were correlated to the increased values of iso­ thermal crystallization temperatures/  (18oC, 20oC, and 22oC, respectively). From rheometry analysis of RBD palm oil (at the isothermal crystallization temperature of 18oC), the rheograms gave the values of the phase shift angle ( ), storage modulus () and complex modulus () at the end of crystallization process as follows: 24o,11.36 kPa, and 39 kPa. The overlay of   andgavewith the value of 49.6 Pa at the isothermal time of 11.7 minute.

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Journal Info

Abbrev

agritech

Publisher

Subject

Agriculture, Biological Sciences & Forestry

Description

Agritech with registered number ISSN 0216-0455 (print) and ISSN 2527-3825 (online) is a scientific journal that publishes the results of research in the field of food and agricultural product technology, agricultural and bio-system engineering, and agroindustrial technology. This journal is ...