Discussed about the morphology and structure of nanofibers, nanofiber isolations, the importance and effect of pretreatment process, and application of nanofiber in biocomposites. Aiming to study the current trend and exploration of cellulose based nanocomposite.
Authors:
Ida Idayu Muhamad, Siti Nur Hana Mamat, Mohd Harfiz Salehudin & Eraricar Salleh
Work on Biopolymer and Biomaterial processing – This study investigated the effects of pH and temperature on the growth and β-glucosidase activity of Lactobacillus rhamnosus NRRL 442 during anaerobic fermentation. Initially, the β-glucosidase activity of the cell harvested from shake flask culture was characterized. The result indicated the cell exhibited the highest specific β-glucosidase activity at pH 6.5 and 46 o C. Subsequently, the effect of fermentation pH (range: 4.5-6.5) on cell growth and β-glucosidase activity was investigated in 2-L bioreactor. Cell suppression due to acidity (pH ≤ 4.5) was observed in fermentation with controlled and uncontrolled pH.
Authors:
Ida Idayu Muhamad, C T Lee, F S Kok & F Razali
ABSTRACT Dry powder of red color from roselle calyces, which can be used as natural colorant and functional food ingredient, was produced using microen-capsulation technique. Four different matrices, i.e., maltodextrin, gum Arabic, combination of maltodextrin and gum Arabic, and soluble starch were used for encapsulation study. Identification and measurement of anthocyanins in encapsulated roselle was made by high-performance liquid chromatography. Encapsulation efficiencies were determined and compared with storage analy-sis data. The stability of encapsulated pigments was investigated during storage under three different storage temperatures (4, 25 and 37C) until 105 days. The four type of matrices largely increased the half-life of the pigments during storage especially at 37C (P < 0.05) compared with the non-encapsulated roselle extract. Storage temperature did not significantly (P > 0.05) effect the L*, a* and b* values. However, type of encapsulation 4 Corresponding author.
Authors:
Zuhaili Idham, Ida Idayu Muhamad, Mohd Roji Sarmidi
Beads of kappa-carrageenan/sodium carboxymethylcellulose were prepared based on different blend formulations using genipin, a natural and non-toxic cross-linking reagent. Different genipin concentrations were used to study the effects on swelling ratio of the beads in different pH values under simulated gastrointestinal tract condition. It was found the beads released beta-carotene slower and lesser after being cross-linked, exhibited enhanced network stability and structure to be applied as suitable hydrogel for drug carrier.
Authors:
Ida Idayu Muhamad, Ng Hui Hui, Noor Anis Mustapha & Lim Shu Fen