Evolution of thermo-physical properties of Akuama (picralima nitida) seed and antioxidants retention capacity during hot air drying

Ndukwu, Macmanus Chinenye; Bennamoun, Lyes; Anozie, O.

doi:10.1007/s00231-018-2379-2

Cited by 15 publications

(8 citation statements)

References 36 publications

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“…Although some research has been carried out on hybrid solar dryers in Nigeria and some other tropical countries; however, analysis of these dryers focused on drying kinetics of the products and time reduction abilities (Boughali et al 2009;Ndukwu et al 2018a). This present study considers the performance of hybrid solar dryers in relation to varying operational factors viz, temperature of air, speed of air, and sample thickness, which some researchers (Aghbashlo et al 2013;Aviara et al 2014;Ndukwu et al 2018a, b;Ndukwu et al 2020b) did not put into consideration.…”

Section: Introductionmentioning

confidence: 92%

“…Therefore, exergy analysis which takes into consideration various losses within the system has become a more useful tool for performing energy evaluations (Aghbashlo et al 2013). Exergy analysis has also amongst its advantages the ability to present the environmental sustainability impact of energy utilization (Erbay and Icier 2011;Nazghelich et al 2010;Aghbashlo et al 2013;Aviara et al 2014;Ndukwu et al 2018a). This latter part is becoming of interest to researchers due to climate issues.…”

Section: Introductionmentioning

confidence: 99%

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Environmental Sustainability Analysis of a Hybrid Heat Source Dryer

et al. 2020

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This paper presents the energy and exergy-based environmental sustainability analyses of a developed solar dryer equipped with electric heater as supplementary heat. The experimental study was applied for drying a local variety of red pepper (Shombo) near a coastal region of eastern Nigeria. The objectives of the study were to assess the suitability and overall performances of the hybrid solar dryer in this area. Results obtained indicate that the solar collector contributed about 39.4 to 48.5% of the total drying air temperature required for drying operation. The energy efficiency of the hybrid solar dryer ranged between 13.2 to 35.6%, whereas the specific energy requirements varied between 7.24 kJkg − 1 to 63.5 kJkg − 1 . The percent solar energy contribution to the total energy requirement ranged between 28.8-52.68% at varying air temperatures (50, 60, and 70 o C) and air velocities (1.14, 2.29, and 3.43 ms − 1 ). The drying time varied between 75 ± 5 to 180 ± 24 min. The energy and exergy efficiencies varied between 13.2-35.6% and 35.8 to 92.3%, respectively. The exergy-based sustainability indicators which take into account the ratio of waste exergy, sustainability index, and improvement capacity of the hybrid heat source dryer were found to be 0.11-0.167, 1.14-6.12, and 0.099-0.289 kJs − 1 , respectively. Comparison between a CI-engine powered dryer reveals that the use of a hybrid solar-electric dryer can prevent emission of 398.86 to 3872.7 tons of CO 2 into the environment per annum. Recommendation for future studies was suggested.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Environmental Sustainability Analysis of a Hybrid Heat Source Dryer

et al. 2020

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“…enhances the loss of volatile constituents which escape with the moisture content loss. When this happens, voids are created, leading to an increase in the diffusion path of the water molecules [37]. Therefore the heat transfer coefficient of the material decreases with the thermal conductivity [38].…”

Section: Thermo-physical Propertiesmentioning

confidence: 99%

“…The mass transfer coefficient (hm) therefore, was deduced by combining it with the heat transfer coefficient [16] as follows 6…”

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confidence: 99%

Moisture evolution, thermal properties and energy consumption of drying spent grain pellets from a blend of some cereals for small-scale bio-energy utilization: modelling and experimental study

Ndukwu

Horsfall²,

Lamrani³

et al. 2022

Biomass Conv. Bioref.

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A fixed bed convective dryer was used to assess the influence of drying temperature and geometry deformation on moisture and thermo-physical property evolution of solid fraction pellets (spent grain) from wet milling of cereal blends for bio-energy generation for small homes. The aim is to study the physical mechanism of drying the pellets that includes temperature and moisture behaviour, transport phenomena, the response rate to varying process conditions, drying time, and energy utilization which can be applied in the development of a fixed bed dryer for drying the pellets at a lower scale. introducing shrinkage. The verification of the model gave the mean absolute error (MAE) for moisture content with shrinkage as 0.0366 -0.1500 while for without shrinkage was 0.0729 -0.1500 for 60-80 o C. The effective moisture diffusivity with integrating shrinkage is lower than non-shrinkage though these values varied with drying time. Fitting the moisture ratio with the exponential drying curve equations shows that logarithmic equations were the best model for drying at 60 and 70 o C while Henderson and Pabis's model was better at 80 o C isothermal drying. Thermophysical analysis showed that the average specific heat capacity ranges from 5423.387 to 5198.197J/kgK while the thermal conductivity ranged from 0.115281to 0.136882W/mK at 60-80 o C. The energy and specific energy consumption ranged from 0.41 to 0.494 kWh and 108.39 to 119.29MJ/kg. The shrinkage ratios, effective diffusivity and energy and specific energy consumption were empirically presented as a function of moisture, temperature and or air velocity variations with a high degree of association.

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“…Scientific reports have confirmed its use in folklore medicine for antibacterial control. [1][2][3][4][5][6][7][8] Its antiviral activity has been noted in the laboratory; 9 also, the anti-protozoan activity has been reported. 10 It has been shown to possess blood sugarreducing activity both in hyperglycaemic and normoglycaemic wistar rats; confirming its use in folklore medicine for treating diabetes mellitus.…”

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Shelf-Life of Formulated Herbal Liquid Dosage Forms of Picralima nitida Seed Extracts for Anti-hyperglycaemic Indication

2021

TJNPR

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Picralima nitida (famApocynaceac) is a deciduous tree with wide distribution in the tropical rain forests of Africa. The plant is gaining increasing scientific and medicinal importance because of its use for treating wide range of ailments. Scientific reports have confirmed its use in folklore medicine for antibacterial control. [1][2][3][4][5][6][7][8] Its antiviral activity has been noted in the laboratory; 9 also, the anti-protozoan activity has been reported. 10 It has been shown to possess blood sugarreducing activity both in hyperglycaemic and normoglycaemic wistar rats; confirming its use in folklore medicine for treating diabetes mellitus. [11][12][13] The extracts of the plant have been shown to be very safe for human consumption. 14 In the practice of traditional medicine, the plant products are prepared under unhygienic conditions into several crude dosage forms. In these forms, the safety and stability remain undetermined. In the present study, the extract of the plant seeds and the pulp, obtained after the removal of the seeds, were formulated into standard dosage forms and evaluated for hypoglycaemic activity. The dosage forms produced from the plant materials were subjected to stability studies using conventional method often employed for orthodox drugs to establish their shelf-life.

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Evolution of thermo-physical properties of Akuama (picralima nitida) seed and antioxidants retention capacity during hot air drying

Cited by 15 publications

References 36 publications

Environmental Sustainability Analysis of a Hybrid Heat Source Dryer

Environmental Sustainability Analysis of a Hybrid Heat Source Dryer

Moisture evolution, thermal properties and energy consumption of drying spent grain pellets from a blend of some cereals for small-scale bio-energy utilization: modelling and experimental study

Shelf-Life of Formulated Herbal Liquid Dosage Forms of Picralima nitida Seed Extracts for Anti-hyperglycaemic Indication

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