Dehydration Time Research Articles

Evolution Characteristics of Pore–Fractures and Mechanical Response of Dehydrated Lignite Based on In Situ Computed Tomography (CT) Scanning

Based on the uniaxial compression tests and in situ CT scanning experiments of lignite with different dehydration times and the fractal theory, this paper qualitatively and quantitatively investigated the influence of the dehydration effect on the evolution of pore–fractures and the mechanical behavior of lignite under uniaxial compression conditions. The results show that the dehydration effect significantly affects the pre-peak deformation and post-peak failure behavior of lignite but has no significant impact on its peak strength. The pore–fracture parameters, such as the fractal dimension, surface porosity, and fracture volume, of three samples all exhibit an evolutionary pattern of “continuous decrease in the compaction and elastic stages–gradual increase in the plastic stage–sharp growth in the post-peak stage” with the dynamic evolution of the pore–fractures. However, the dehydration effect leads to an increase in the intensity of pore–crack evolution and a nonlinear rise in all the parameters characterizing the pore–crack complexity during uniaxial compression, which, in turn, leads to an increment in the fluctuation of the above evolutionary trends. The mechanism underlying the differential influence of the dehydration effect on the macroscopic mechanical behavior of lignite is follows: The dehydration effect non-linearly and positively affects the initial pore–fracture structure of lignite, thereby non-linearly and positively promoting the evolution of pore–fractures during the loading process. Nevertheless, since it fails to weaken the micro-mechanical properties of lignite and cannot form effective through-going fractures, it has no significant impact on the uniaxial compressive strength of the coal samples. The findings of this study can provide some references for the support design and deformation control of underground lignite roadways.

Synthesis of Poly(butylene succinate) Catalyzed by Tetrabutyl Titanate and Supported by Activated Carbon.

Polybutylene succinate (PBS) is a biodegradable aliphatic polyester with excellent thermal stability, mechanical properties, and processability. The synthesis of PBS typically employs titanium-based catalysts like tetrabutyl titanate (TBT) to accelerate the reaction. However, TBT acts as a homogeneous catalyst and is non-recyclable. This study aims to minimize the cost of recovering liquid TBT catalyst during PBS synthesis by using TBT-loaded activated carbon for direct esterification and optimizing the process conditions. The catalyst was analyzed using inductively coupled plasma emission spectroscopy, automated specific surface area and pore size analysis, X-ray diffraction, and Fourier-transform infrared spectroscopy. The product was evaluated through infrared spectroscopy, nuclear magnetic resonance hydrogen spectra, and gel permeation chromatography. The optimal process parameters were determined to be an esterification temperature of 170 °C, a polycondensation temperature of 235 °C, an acid-to-alcohol molar ratio of 1:1.2, a catalyst amount of 0.06 g, and a dehydration time of 3 h. Under these conditions, the weight-average molecular weight of PBS reached 47,655, reducing the catalyst usage from 0.5% to 0.3%, resulting in a 24.7% increase in catalytic efficiency compared to TBT, significantly lowering costs. After five cycles of reuse, the weight-average molecular weight of the product remained above 35,000. This study demonstrates that TBT-loaded activated carbon exhibits superior catalytic performance, offering a cost-effective and efficient method for industrial PBS production with broad application potential.

Optimizing the preparation of paraffin sections from stallion testes.

The preparation of paraffin sections is an important experimental technique in animal histological research, and key factors that determine the quality of a section include the dehydration time, waxing time, and drying temperature of the paraffin section. Paraffin sections obtained from testis tissue of adult horses exhibited higher quality with clear tissue structure and complete cell morphology after they underwent gradient dehydration for 6 hours, were immersed in wax for 60 minutes, and were dried in a 75-degree oven for 15 minutes. The detailed, optimized procedures that are developed in the current study may simplify histological experiments and research on equine testes.

New Method for Enhancing Coconut (Cocos nucifera L.) Embryo Dehydration: An Important Step Towards Proficient Cryopreservation.

The coconut (Cocos nucifera L.), a valuable tropical crop, is rapidly declining in genetic diversity due to natural disasters, pest and disease attack, and land clearing for other crops. Seed banking is impractical for coconut conservation due to its large, recalcitrant seed, and maintaining field gene bank collections is costly and vulnerable to environmental pressures. Cryopreservation offers a promising alternative method for conserving coconut genetic diversity, but the success in recovering cryopreserved materials remains limited, with few studies consistently reporting high rates of recovery. This highlights the need for improved cryopreservation protocols, particularly in tissue dehydration, which is one of the critical steps in the process of cryopreservation and plant recovery. A desiccator was developed that enabled rapid embryo dehydration with ultra-dry airflow. The desiccator reduced embryo moisture content to 20% (the predetermined viability threshold) within 6 h representing a 2-h improvement when compared to a previous dehydration approach, while maintaining a high germination rate (71%). Smaller embryos (500 to 550 mg fresh weight) desiccated faster than larger embryos (800 to 900 mg fresh weight) but germination was reduced (30%), making small embryos unsuitable for cryopreservation. A 5-day sucrose (0.4 M) pre-treatment further reduced the dehydration time to 4 h, while maintaining a high germination rate (70%). These advances in the use of a sucrose pre-treatment, the rapid embryo dehydration, and selection of large embryos size will help to enhance the success of coconut embryo cryopreservation and recovery.

The Effect of the Use of Unconventional Solutions for Osmotic Dehydration on Selected Properties of Fresh-Cut Oranges.

This study investigated the effects of unconventional solutions on the osmotic dehydration of oranges. These solutions included xylitol, fruit concentrates (strawberry, cherry, orange), rosehip juice, and sucrose. The study examined dehydration kinetics, dry matter, total soluble solids, water activity, color, texture, sugars, vitamin C, polyphenols, carotenoids, and antioxidant potential, alongside microstructural observations. The results indicated that osmotic solutions and the dehydration time (3 h) significantly influenced the oranges' physical and chemical properties. Cherry and strawberry concentrate solutions caused the greatest color changes, enhancing the dried product's visual appeal. Oranges dehydrated with strawberry concentrate exhibited the highest polyphenol content (2909 mg chlorogenic acid/100 g d.m.) and antioxidant potential (11.0 mg TE/d.m.), while rosehip solution yielded the highest vitamin C levels (80.27 g/100 g d.m.), followed by strawberry (62.32 g/100 g d.m.) and orange (47.67 g/100 g d.m.) concentrates. These findings highlight the benefits of using fruit concentrates and juices in osmotic dehydration. The unconventional osmotic solutions resulted in a reduction in the hardness of dehydrated orange sliced from 0.65 N to the range of 0.36-0.60 N, except for strawberry concentrate, which resulted in the highest value (0.72 N). Key parameters, such as the water activity, dry matter, and dehydration efficiency, were more favorable compared to those in the sucrose solution samples. The organoleptic assessment recommended xylitol for maintaining sweetness without altering taste or smell, whereas strawberry juice scored lowest due to its foreign taste and smell. Overall, osmotic dehydration enhanced the nutritional and sensory attributes of oranges by allowing the penetration of bioactive compounds, making them superior to fresh raw material in tested parameters.

Developing a Label-Free Infrared Spectroscopic Analysis with Chemometrics and Computational Enhancement for Assessing Lupus Nephritis Activity.

Patterns of disease and therapeutic responses vary widely among patients with autoimmune glomerulonephritis. This study introduces groundbreaking personalized infrared (IR)-based diagnostics for real-time monitoring of disease status and treatment responses in lupus nephritis (LN). We have established a relative absorption difference (RAD) equation to assess characteristic spectral indices based on the temporal peak heights (PHs) of two characteristic serum absorption bands: ν1 as the target signal and ν2 as the PH reference for the ν1 absorption band, measured at each dehydration time (t) during dehydration. The RAD gap (Ψ), defined as the difference in the RAD values between the initial and final stages of serum dehydration, enables the measurement of serum levels of IgG glycosylation (ν1 (1030 cm-1), ν2 (1171 cm-1)), serum lactate (ν1 (1021 cm-1), ν2 (1171 cm-1)), serum hydrophobicity (ν1 (2930 cm-1), ν2 (2960 cm-1)), serum hydrophilicity (ν1 (1550 cm-1), ν2 (1650 cm-1)), and albumin (ν1 (1400 cm-1), ν2 (1450 cm-1)). Furthermore, this IR-based assay incorporates an innovative algorithm and our proprietary iPath software (ver. 1.0), which calculates the prognosis prediction function (PPF, Φ) from the RAD gaps of five spectral markers and correlates these with conventional clinical renal biomarkers. We propose that this algorithm-assisted, IR-based approach can augment the patient-centric care of LN patients, particularly by focusing on changes in serum IgG glycosylation.

Исследование возможности получения вяжущих материалов из отходов фосфорной промышленности

The research work is devoted to the possibility of recycling large-tonnage solid waste of phosphorus production – phosphogypsum in order to obtain binders for use in the construction industry to obtain various building materials. The main parameters of the process (the composition of the main raw material, the degree of grinding of the raw material, the temperature and time of dehydration of phosphogypsum) were investigated in the work. Physical and chemical studies of the properties and structure of wastes have been carried out, which make it possible to determine the fundamental possibility (or impossibility) of their use in a particular production. The use of the Rankin diagram as a technical model made it possible to determine the location of technogenic wastes of phosphorus production. The X-ray phase analysis of the gypsum binder samples showed that the X-ray patterns show lines of diffraction maxima corresponding to hemihydrate calcium sulfate, i.e., upon heat treatment of phosphogypsum up to 200°C, dihydrate gypsum in the composition of phosphogypsum mainly transforms into hemihydrate gypsum, which has good binding properties. The results of the conducted studies showed the feasibility of processing old phosphogypsum into gypsum binder.

Breakdown mechanism and application of high frequency pulsed electric field-demulsifier combination on water-in-oil emulsion

Breakdown mechanism and application of high frequency pulsed electric field-demulsifier combination on water-in-oil emulsion

Dehydration and nutrient loss during the haymaking process of tropical forage legumes

ABSTRACT The objective was to evaluate nutrient loss during the dehydration process of three tropical forage legumes. The legumes studied were Stylosanthes spp. (80% Stylosanthes capitata + 20% Stylosanthes macrocephala), Pueraria phaseoloides, and Macrotyloma axillare. The forage was cut at 6:45 am, chopped and spread on polyethylene tarps to be exposed to the sun. Dry matter (DM) content, neutral detergent fiber corrected for ash and protein (NDFap), crude protein (CP), non-protein nitrogen (NPN), ether extract (EE), soluble carbohydrates (SCH), and total digestible nutrients (TDN) were analysed. On the third day, Stylosanthes spp. and Pueraria phaseoloides exhibited the highest dehydration rates (3.47% and 3.81% water loss/hour, respectively), followed by the first day (3.17% and 3.05% water loss/hour). There was an interaction (P < 0.05) between dehydration times and legumes for DM, CP, NPN, EE, and SCH. Among the legumes, Stylosanthes spp. had the highest (P < 0.05) NDFap levels (512.5 g.kg-1 in hay), Pueraria phaseoloides presented the highest (P < 0.05) CP levels, and Macrotyloma axillare exhibited the highest (P < 0.05) levels of EE and SCH (197.4, 25.7, and 32.2 g.kg-1 in hay, respectively). During dehydration, the contents of NPN, EE, and SCH decreased linearly (P < 0.05). All legumes showed a decrease in NPN, EE, and SCH contents.

INTENSIVE DRYING METHODS FOR APPLE SLICES WITH CONVECTION AND COMBINED ENERGY SUPPLY

Drying is a mass-exchange process of removing moisture from a material by evaporation, which results in an increase in the shelf life of raw materials while reducing transport weight. Apples are a common type of fruit that is present in our diet almost all year round. They contain a significant amount of vitamins (C, B1, B2, P, E), manganese, potassium, and easily digestible iron. Apples are hypoallergenic and can be consumed by almost everyone. The purpose of the work is to intensify the drying of apple slices to low residual moisture without loss of biologically active substances. Research methods. The study of the kinetics of the slices drying process was performed on an experimental convective stand with a system of automatic recording and processing of information at a drying agent temperature of 60, 80, 80/60 ºC and a stepwise combined mode with a combination of IR radiation and convective heating of IR (100 W)+60 °C/60 °C, speed 1.5 m/s, moisture content 10 g/kg dry air. Results and conclusions. Summarising the research results, it can be concluded that the temperature of the drying agent at 80 °C ensures a short duration of the dehydration process, but the organoleptic characteristics of the finished product are unsatisfactory. Drying at a temperature of 60 °C leads to an increase in dehydration time, and as a result, to an increase in energy consumption and a deterioration in organoleptic characteristics and recoverability. It is recommended that the dehydration process of slices be carried out according to the developed stepwise drying modes: convective 80/60 °C and combined infrared-convective IR (100 W) + 60 °C / 60 °C. Based on the study of the kinetics of moisture exchange in the combined convective-infrared mode of drying apple slices, a formula for calculating the total duration of the process was obtained. The difference between the experimental and theoretical values of the drying time does not exceed 3%. The analysis of the constructed dependences of the Rebinder's number confirms the energy efficiency of the recommended modes of drying apple slices. The resulting product under the developed stepwise drying regimes has high recoverability (78...80%) and organoleptic characteristics: balanced taste, natural aroma, and light cream colour inherent in the raw material.

Improving Mass Transfer by Vacuum Impregnation During Osmotic Dehydration of Ripe Kadamb (Neolamarckia cadamba) Fruit

ABSTRACTKadamb (Neolamarckia cadamba) is an underutilized fruit which has many nutritional and medicinal properties. The literature availability on utilization of kadamb as food is scarce. The present work was carried out to find the effect of vacuum impregnation during osmotic dehydration on the quality of kadamb fruit (Neolamarckia cadamba) candy (KC). The vacuum impregnation at 100 mbar for 15 min, brix value of hypertonic solution at 60°, 65°, 70°, and 75°, and time of osmotic dehydration 24, 36, 48, and 72 h were taken as variables in the process. Mass transfer parameters like water loss, solute gain, and weight reduction for all samples were calculated. The treatment with 75° Brix, 48 h, 100 mbar vacuum for 15 min got best results with more water loss (67.48% ± 1.11%), solute gain (19.63% ± 0.32%), and less weight reduction (40.51% ± 0.39%), respectively. No microbial load was found in the developed candy. Infrared (IR) spectrum, texture profile analysis, and field emission scanning electron microscopy tests revealed the availability of compounds, textural and microstructure of KC, respectively. The candy prepared from 75° Brix, 48 h, 100 mbar vacuum for 15 min has the highest organoleptic scores. The prepared candy cubes were packed into low‐density polyethylene (LDPE) pouches and stored under ambient conditions, and the quality changes during storage were studied.

Cryopreservation of Arum palaestinum plant callus as a strategy for mitigating extinction risks

Cryopreservation of Arum palaestinum plant callus as a strategy for mitigating extinction risks

Biological characteristics of Leersia japonica (Makino) Honda and its implications for weed management.

Leersia japonica (Makino) Honda is a perennial weed and currently identified as a new dominant weed species in rice fields in many countries, including China. Here, we studied the biological characteristics combined with nonchemical management of L. japonica to develop a proper control strategy of this weed. The results showed that 33/28 °C in a 12 h:12 h, light:dark photoperiod were the most suitable growth conditions for seedling regeneration. Salt (NaCl) inhibits the regeneration of seedlings totally at a concentration of 51.3 mm. Seedlings of L. japonica could regenerate in a wide range of pH environments (from 3.50 to 9.50), endowing L. japonica with strong pH adaptability. Osmotic stress also inhibits the regeneration of seedlings totally at -0.13 MPa. A long dehydration time inhibits the regeneration of seedlings; no seedlings could be regenerated for 15 h. With low soil moisture content (33.3% and 50%), the regeneration rate and aboveground fresh weight (FW) were significantly lower than these with high soil moisture content (66.7% and 100%). Stem segments buried in the surface (0 cm) of soil could produce seedlings with the highest regeneration rate (37.5%) and seedling aboveground FW (0.64 g). As the soil depth increased, the regeneration rate and aboveground FW decreased significantly and no seedlings could be regenerated beyond 6.9 cm. Based on these biological characteristics of L. japonica, creating an environment that is not conducive to regeneration combined with an appropriated tillage system could effectively reduce its occurrence. © 2024 Society of Chemical Industry.

Conventionally cooked and UV-A light dehydrated beef jerky: Effects on physicochemical properties

Conventionally cooked and UV-A light dehydrated beef jerky: Effects on physicochemical properties

Effects of dehydration time on performances of polyamidoamine-epichlorohydrin resin and its modified soybean-based adhesive

Effects of dehydration time on performances of polyamidoamine-epichlorohydrin resin and its modified soybean-based adhesive

Experimental Study on the Characteristics of Camellia oleifera Fruit Shell Explosion by Hot Air Drying

The shell explosion by hot air drying is a critical step in the processing of Camellia oleifera fruit (COF), which directly affects the degree of the shell explosion, and the separation effect of Camellia oleifera seed and Camellia oleifera shell after the shell explosion of COF. To reveal the characteristics of the COF shell explosion, a hot air drying device was designed based on mass conservation and drying principles. The physical characteristics of COF and the evolution of drying parameters were thoroughly analyzed with a combination method of drying analysis and experimental. Moreover, under the conditions of air temperature 50–70 °C, relative humidity 20–50%, and air velocity 1.3–1.9 m/s, the internal relationship between COF shell explosion formation through hot air drying and the hot air drying medium was systematically investigated by response surface methodology, and a prediction model for the shell explosion rate of COF by hot air drying was constructed using statistical methods. Results demonstrated that decreasing the relative humidity and increasing the temperature and air velocity of the drying medium could reduce the dehydration time of COF. The moisture content of Camellia oleifera shell was found to be 177.45% d.b. (dry basis) at the initial cracking stage of COF. Furthermore, at temperatures ranging from 50 to 70 °C Deff values of COF were estimated to be within the range of 0.915 × 10−9 to 1.782 × 10−9 m2/s. Similarly, at relative humidity levels of 20 to 50%, Deff values ranged from 1.226 × 10−9 to 1.501 × 10−9 m2/s. At an air velocity of 1.3 to 1.9 m/s, Deff values ranged from 0.956 × 10−9 to 1.501 × 10−9 m2/s. The measured values of the shell explosion rate were in close agreement with that calculated using the fitted model, with a correlation coefficient of 0.997 and a root mean square error of 0.9743. This study will provide a theoretical basis for optimizing the shell explosion process and improving shell explosion rate of COF by hot air drying.

Developing a simple and rapid method for cell-specific transcriptome analysis through laser microdissection: insights from citrus rind with broader implications

BackgroundWith the rapid development of single-cell sequencing technology, histological studies are no longer limited to conventional homogenized tissues. Laser microdissection enables the accurate isolation of specific tissues or cells, and when combined with next-generation sequencing, it can reveal important biological processes at the cellular level. However, traditional laser microdissection techniques have often been complicated and time-consuming, and the quality of the RNA extracted from the collected samples has been inconsistent, limiting follow-up studies. Therefore, an improved, simple, and efficient laser microdissection method is urgently needed.ResultsWe omitted the sample fixation and cryoprotectant addition steps. Instead, fresh samples were embedded in Optimal Cutting Temperature medium within 1.5 ml centrifuge tube caps, rapidly frozen with liquid nitrogen, and immediately subjected to cryosectioning. A series of section thicknesses of citrus rind were tested for RNA extraction, which showed that 18 μm thickness yielded the highest quality RNA. By shortening the dehydration time to one minute per ethanol gradient and omitting the tissue clearing step, the resulting efficient dehydration and preserved morphology ensured high-quality RNA extraction. We also propose a set of laser microdissection parameters by adjusting the laser power to optimal values, reducing the aperture size, and lowering the pulse frequency. Both the epidermal and subepidermal cells from the citrus rind were collected, and RNA extraction was completed within nine hours. Using this efficient method, the transcriptome sequencing of the isolated tissues generated high-quality data with average Q30 values and mapping rates exceeding 91%. Moreover, the transcriptome analysis revealed significant differences between the cell layers, further confirming the effectiveness of our isolation approach.ConclusionsWe developed a simple and rapid laser microdissection method and demonstrated its effectiveness through a study based on citrus rind, from which we generated high-quality transcriptomic data. This fast and efficient method of cell isolation, combined with transcriptome sequencing not only contributes to precise histological studies at the cellular level in citrus but also provides a promising approach for cell-specific transcriptome analysis in a broader range of other plant tissues.

Developing Effective Radio Frequency Vacuum Drying Processes for Moutan Cortex: Effect on Moisture Migration, Drying Kinetics, Physicochemical Quality, and Microstructure.

This study aims to maximize the post-harvest quality of Moutan Cortex and reduce energy consumption. Radio frequency vacuum (RFV) technology was used to dehydrate Moutan Cortex in this study to investigate the effects of different drying temperatures, plate spacing, and vacuum degree on the drying kinetics, physicochemical quality, and microstructure of Moutan Cortex. The results showed that RFV drying shortened the dehydration time of the Moutan Cortex by 10.71-28.57% and increased the drying rate by 15.79-54.39% compared to hot-air drying. The best color (∆E = 6.08 ± 0.28, BI = 26.97 ± 0.98) and relatively high retention of polysaccharides, total phenolics, total flavonoids, antioxidant properties, paeonol, gallic acid, paeoniflorin, and benzoylpaeoniflorin contents were observed in the dried products of Moutan Cortex at a drying temperature of 50 °C, spacing of 90 mm, and vacuum of 0.025 MPa. Analyzing the microstructure, it was found that RFV drying could effectively inhibit the shrinkage and collapse of the cellular structure, and a regular and loose honeycomb pore structure appeared inside the samples, which contributed to the rapid migration of the internal moisture. This study can provide a theoretical reference basis for the selection and application of industrialized processing methods of high-quality Moutan Cortex.

Effect of ultrasound combined with chemical pretreatment as an innovative non-thermal technology on the drying process, quality properties and texture of cherry subjected to radio frequency vacuum drying

To obtain high-quality cherry products, ultrasound (US) combined with five chemical pretreatment techniques were used on cherry prior to radio frequency vacuum drying (RFV), including carboxymethyl cellulose coating (CMC), cellulase (CE), ethanol (EA), isomaltooligosaccharide (IMO), and potassium carbonate + ethyl oleate (PC + AEEO). The effect of different pretreatments (US-CMC, US-CE, US-EA, US-IMO, US-(PC + AEEO)) on the drying characteristics, quality properties, texture, and sensory evaluation of cherries was evaluated. Results showed that the dehydration time and energy consumption were decreased by 4.17 − 20.83 % and 3.22 − 19.34 %, respectively, and the contents of individual sugars, soluble solid, total phenolics (TPC), natural active substances, total flavonoids (TFC), and antioxidant properties (DPPH, ABTS and FRAP) were significantly increased after US combined with five chemical treatments (P < 0.05). Moreover, the pretreatment played important role in improving texture properties and surface color retention in the dried cherries. According to the sensory evaluation analysis, the dehydrated cherries pretreated with US-CMC exhibited the highest overall acceptance, texture, crispness, color, and sweet taste showed lower off-odor, bitter taste and sour taste compared to control and other pretreatments. The findings indicate that US-CMC pretreatment is a promising technique for increasing physicochemical qualities and dehydration rate of samples, which provides a novel strategy to processing of dried cherry.

Understanding the evolution of moisture during isothermal dehydration of glutinous rice through global sensitivity analysis

Understanding the evolution of moisture during isothermal dehydration of glutinous rice through global sensitivity analysis