Browsing by Author "J. S. Lee"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
- Some of the metrics are blocked by yourconsent settings
Publication Changes In Microstructures Of Rambutan Seed And The Quality Of Its Fat During Drying(Springer Nature Switzerland AG, 2020) ;M. H. A. Jahurul ;S. S. Nee ;M. R. Norazlina ;M. Hasmadi ;M. S. Sharifudin ;M. Patricia ;J. S. Lee ;A. Shihabul ;H. M. S. Amir ;R. Jumardi ;A. W. NoorakmarJ. NorlizaThe application of pre-treatment on oilseeds prior to extraction process may exert undesirable impact towards the quality of oils as well as microstructures of seed. The objectives of this study were to evaluate the effects of three drying methods on the microstructures of rambutan seeds and its effects on physicochemical properties of rambutan seed fat (RSF). The fats that being pre-treated with three different drying methods showed shrinkage or alteration of porous structure in terms of size, shape, and diameter. The differences between the RSF pre-treated with oven-, freeze-, and cabinet drying RSF were in fatty acids (oleic and arachidic acids), and free fatty acid (1.56–1.80 mg KOH/g fat). From the results obtained, the useful information regarding to the effects of pre-treatment on RSF, which is a potent ingredient to be used as a cocoa butter substitute in the formulation of chocolate in the confectionery industries. Moreover, the outcomes of this work able to provide information for better grasp about the correlation of drying methods and quality of RSFs, as well as its applications in other food industries. - Some of the metrics are blocked by yourconsent settings
Publication Effects of drying methods on oxidative stability of roselle seed oil (Hibiscus Sabdariffa): an optimization approach(Springer Link, 2021) ;M. H. A. Jahurul ;O. K. Shian ;M. S. Sharifudin ;M. Hasmadi ;J. S. Lee ;A. H. Mansoor ;R. Jumardi ;M. Firoz Khan ;S. Jinap ;A. K. Mohd OmarI. S. M. ZaidulThe objective of this study was to optimize the extraction of oil from pre-dried roselle seeds using response surface methodology (RSM). We also determined the oxidative stability of oil extracted from oven and freeze-dried roselle seed in terms of iodine value (IV), free fatty acid (FFA) value, peroxide value (PV), P-anisidine and total oxidation values (TOTOX value). The RSM was designated based on the central composite design with the usage of three optimum parameters ranged from 8 to 16 g of sample weight, 250–350 mL of solvent volume, and 6–8 h of extraction time. The highest oil yielded from roselle seed using the optimization process was 22.11% with the parameters at sample weight of 14.4 g, solvent volume of 329.70 mL, and extraction time of 7.6 h. Besides, the oil extracted from the oven dried roselle seed had the values of 89.04, 2.11, 4.13, 3.76 and 12.03 for IV, FFA, PV, P-anisidine, and TOTOX values, respectively. While for the oil extracted from freeze-dried roselle seed showed IV of 90.31, FFA of 1.64, PV of 2.47, P-anisidine value of 3.48, and TOTOX value of 8.42. PV and TOTOX values showed significant differences whereas; IV, FFA, and P-anisidine values showed no significant differences between the oven and freeze-dried roselle seed oils.