Quality Assessment of Dried‐Bean with Biochemical Parameters

International Journal of Food Properties

Sosa

et al. 2008

Quality assessment of carrot cubes preserved through batch dehydration introducing tempering cycles was performed in this study. The parameters considered were: the percentage of carotene retention, peroxidase inactivation and retention of invertase activity, as well as the degree of rehydration. Although, a similar final moisture content was always reached through the different carrot dehydration process, that with tempering cycles had better qualities than those without tempering. Carotene and invertase activity retention showed higher values, and peroxidase showed lower values compared to a control samples in all cases. Respect to the rehydration tests, no differences were found in all samples. As of the treatments with tempering cycles, the best scheme was 20 min drying time and 20 min tempering time at 70°C.

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biochemical Quality Assessment of Dehydrated Carrots

Castro

International Journal of Food Properties

Sosa

et al. 2008

“…Air is extracted from the environment by a fan with a capacity of 0.12 m 3 /s. A 1 HP electric motor (Siemens, Siemens de México, S.A. de C.V., Mexico) is connected to a Micromaster Vector (Siemens, Congleton, England) voltage transformer to enable the selection of different air velocities (Anaya et al 2003). The incoming air temperatures were conditioned to 60, 70 and 80C measured with a digital recorder including a J-type copperconstantan thermocouple (Easy View, model 95001-07, Cole-Parmer, Court Vernon Hills, IL).…”

Section: Experimental Equipmentmentioning

confidence: 99%

“…Given the fact that the advantages of intermittent drying have been validated for different food products (Anaya et al . ; Chua et al . ; Fano et al .…”

Section: Introductionmentioning

confidence: 99%

“…Given the fact that the advantages of intermittent drying have been validated for different food products (Anaya et al 2003;Chua et al 2003;Fano et al 2008;Carrillo et al 2010), the design of a drying equipment specially adapted for the pilot plant scale that can efficiently perform intermittent drying operations is of fundamental importance. A previous report of such an effort was described by Nitz and Pereira (2007), who dried beans using the pulsed fluid bed apparatus where a rotatory system distributes the gas alternately among the different sections of the drying chamber.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Intermittent Drying of Nopal (Opuntia Ficus Indica) in a Fluidized Bed Pilot Dryer Adapted with Revolving Chambers

Vega–Valencia

J Food Process Engineering

Mendoza

et al. 2014

Intermittent drying is a novel method for improving the food drying kinetics, enhancing product quality and reducing energy consumption per unit of moisture removed at the lab scale. However, the drying protocol itself makes it difficult to implement it at the pilot plant scale without important energy loses. Taking this into account, an accessory for a fluidized bed pilot dryer was developed using an arrangement of revolving chambers that could increase the efficiency of the drying process; nopal (Opuntia ficus indica) was employed as a food material. Several drying experiments were conducted at the laboratory scale in order to establish the most appropriate drying condition to be further tested at the pilot plant scale. No statistical difference was observed between the drying curves obtained in the laboratory and pilot plant dryers under conventional and intermittent drying conditions, which means that the arrangement of chambers guarantees equal and consistent treatment of the solid. Interestingly, the results indicate that a drying protocol of nopal size “E” using the adapted fluidized bed dryer with tempering cycles at pilot plant scale can be regarded as an excellent and cost‐effective methodology for processing vegetables without chemical quality losses. Practical Applications In this work, the performance of a novel fluidized bed dryer, adapted with an arrangement of revolving chambers specially designed to increase the efficiency of intermittent drying at the pilot plant scale, was evaluated. Cubes of nopal (Opuntia ficus indica) was chosen to take advantage of a biomaterial with high nutrimental characteristics. It was concluded that the arrangement of the equipment was able to maintain an equal and consistent treatment of the solid that in consequence, lead to a high chemical quality of the final dried product, comparable to that obtained at the laboratory scale. Additionally, the results indicate that the scaling of the process in the dryer prototype was highly efficient as it allowed to increase 300% the amount of biomaterial to be processed in one single drying operation. It was proposed that the use of the dryer adaptor has a great potential to increase the efficiency of drying processes of other biomaterials.

Quality assessment of dehydrated red bell pepper using tempering drying cycles

Montes

Sosa

et al. 2010

Int J of Food Sci Tech

Quality assessment of red bell pepper dices preserved through batch dehydration introducing tempering cycles were performed in this work. The parameters considered were: the percentages of ascorbic acid and final antioxidant activity retention, as well as the influence of calcium chloride on diffusivity and colour values. Although, a similar final moisture content was reached through different red bell pepper dehydration processes, but the one with tempering cycles had better qualities than those without tempering. Ascorbic acid and final antioxidant activity retention showed higher values and so were colour intensities compared to control samples in all cases. In respect to the effective diffusivity coefficients, there was an increment as the calcium chloride concentration increased. As of the treatments with tempering cycles, the best scheme was 15 min drying time and 30 min tempering time at 60°C.