The effect of selected high pressure processing (HPP) parameters on the sensory attributes and
shelf life of jackfruit bulb packed using vacuum skin (VS) and vacuum nylon (VN) packaging
was studied. The samples were stored at chilled temperature (4°C) for shelf life study. HPP
significantly (p < 0.05) increased the shelf life of VS- and VP-packed jackfruit bulbs to 60 d
during chilled storage. In terms of colour stability during storage, both VS- and VP-packed
HP-treated jackfruit bulbs exhibited no significant differences (p > 0.05) in L*, a*, and b*
values. Also, the VS- and VP-packed HP-treated samples exhibited no significant differences
(p > 0.05) in terms of texture. However, the sensory evaluation carried out among 48 panellists
showed that there were significant differences (p < 0.05) between the untreated and HP-treated jackfruit bulbs. The aforementioned results had proven that HPP treatment of 500 MPa for
5 min could successfully extend the shelf life and retain the physicochemical properties of
jackfruit bulbs, regardless of the types of packaging used.
The aim of this study was to develop formulations to produce lycopene nanodispersions and to investigate the effects of the homogenization pressure on the physicochemical properties of the lycopene nanodispersion. The samples were prepared by using emulsification-evaporation technique. The best formulation was achieved by dispersing an organic phase (0.3% w/v lycopene dissolved in dichloromethane) in an aqueous phase (0.3% w/v Tween 20 dissolved in deionized water) at a ratio of 1:9 by using homogenization process. The increased level of homogenization pressure to 500bar reduced the particle size and lycopene concentration significantly (p<0.05). Excessive homogenization pressure (700-900bar) resulted in large particle sizes with high dispersibility. The zeta potential and turbidity of the lycopene nanodispersion were significantly influenced by the homogenization pressure. The results from this study provided useful information for producing small-sized lycopene nanodispersions with a narrow PDI and good stability for application in beverage products.