Effect Of Osmotic Dehydration Research Articles

Textural formation of instant controlled pressure drop–dried peach chips: Investigation of the electrical, thermal, and textural properties of predried peach slices with osmotic dehydration pretreatment

In this study, the effect of osmotic dehydration (OD) pretreatment with various sugar (erythritol, glucose, and trehalose) on the quality of hot-air-predried peach slices was investigated, particularly focusing on electrical properties, texture, thermal stability, and cell wall strength. Furthermore, the correlation between the properties of predried peach slices and the texture of the instant controlled pressure drop (DIC) dried peach chips was explored. OD pretreatments improved the stability and integrity of the cell wall and cell membrane of pre-dried peach slices, which inhibited the excessive expansion of samples during DIC drying. Especially, peach chips with trehalose-OD exhibited the highest crispiness (1.05 mm), the highest hardness (101.34 N) was obtained in erythritol-OD samples. Overall, the type of osmotic agents affected the texture of DIC peach chips with OD pretreatments. It should be noted that trehalose is a promising osmotic agent for controlling and regulating the quality of DIC peach chips.

Inhibition of enzymatic browning in freeze-thawed apricot fruit by combined chlorogenic acid and osmotic dehydration treatments

In this study, the inhibitors of apricot browning were analyzed by investigating the effects of osmotic dehydration (OD) pretreatment combined with chlorogenic acid (CA) on cell disruption, loss of phenolic substrates, and changes in key enzymes during freeze-thawing. Both OD and OD-CA mitigated the deterioration caused by ice crystal damage during freeze-thawing. OD and OD-CA significantly reduces the BI of apricots by 43.27 and 59.55 compared to CK. The PPO and POD activity in OD-CA apricots are only 61.11% and 42.13% of those in OD. OD-CA could also protect SOD and CAT activity, with their activity in the OD-CA being 1.41 and 1.14 times that of OD group. This indicated that OD-CA treatment protected against the activities of ROS-scavenging enzymes. Compared with OD, OD-CA could better protect the bioactive substance of apricot. The contents of ascorbic acid, total phenols, and total flavonoids in OD-CA were 1.32 times, 1.11 times, and 1.05 times higher than those in OD. OD-CA also effectively protected chlorogenic acid, neochlorogenic acid, cryptochlorogenic acid, catechins, and rutin. In summary, OD-CA primarily reduced the browning by protecting the integrity of cell structures, minimizing the potential for exposure to air, enzymes, and phenolic substrates, and inhibiting browning enzymes activity.

Effect of osmotic dehydration combined with vacuum freeze-drying treatment on characteristic aroma components of peach slices

Hot air drying (HD), vacuum freeze drying (FD), and pilot-scale freeze drying (PSFD) are extensively used to prepare peach slices. However, the aroma of hot air drying and vacuum freeze-drying is yet to be addressed. In this study, HS-SPME-GC–MS was used to characterize and quantify the volatile compounds in peach slices. First, 33, 36, and 46 volatile compounds were identified and quantified in the HD, FD, and PSFD groups, respectively. PSFD is preferable to HD and FD in terms of the volatile compound types, content, and aroma profiles. PSFD was selected for subsequent permeation and dehydration experiments. The key aroma compounds with an OAV ≥ 1 were found in the PSFD30 group. GC-O analysis was conducted on the PSFD30 group, leading to the preliminary identification of 2-methylbutanal, pentanal, hexanal, 2-hexenal, phenylacetaldehyde, ethyl acetate, 2-methylbutyl acetate, ethyl lactate, linalool, methyl heptenone, and γ-octalactone as distinctive aromas in dried peach slices.

Effects of osmotic dehydration pretreatment on the drying and characteristics of pineapple slices after microwave hot air rolling bed drying

Abstract This study aimed to investigate the effects of osmotic dehydration (OD) pretreatment on the drying and quality of pineapple slices dehydrated using microwave hot air rolling bed drying method. The result suggested the OD pretreatment significantly reduced the moisture content of the food material before drying. It also slightly increased the moisture ratio decreasing rate in the early stage of drying based on the formation of microchannels during the pretreatment. The pretreatment also increased overall temperature and facilitated the transition of free water to bounded water during drying. Based on the pretreatment, the undesired browning of pineapple slices during drying was significantly inhibited. However, the OD pretreatment with 60 % (w/v) sucrose solution caused significant dehydration of the sample before drying, finally resulting in more dramatic browning. Compared with the sample without OD pretreatment, the dried pretreated pineapple slices exhibited an increased amount of collapsed cell structures and pores, due to the cell deformation and water diffusion during the pretreatment. These microstructure changes finally contributed to their increased hardness, springiness and chewiness. Although the pretreatment caused a slightly higher ascorbic acid loss in the final dried food materials, the product with an improved sugar-to-acid ratio was prepared, indicating its improved acceptability. Considering the overall characteristics profile of the dried pineapple slices, the OD pretreatment using 50 % sucrose solution for 24 h was the optimum condition to develop promising dried pineapple slices products.

Effects of osmotic dehydration pre-treatment on process and quality of freeze-dried strawberries (Fragaria x ananassa var. Mencir)

The freeze-drying of fruits is one alternative to increase the added value of fresh fruit, extend the shelf life which the product, and still have properties like fresh fruit. Osmotic dehydration pre-treatment can be applied before drying techniques to produce a new product, maintain nutritional and sensory quality, and improve the drying process. In this research, the effects of osmotic dehydration on freeze-drying performance and the quality characteristics of freeze-dried strawberries were evaluated. Freeze-dried strawberries were made using fresh strawberries without pre-treatments and pre-treatments by osmotic dehydration (OD) with the freeze-drying method. The treatment of materials and processes used were the duration of storage in the freezer of 36 to 48 h; vertically cutting strawberry before OD; osmotic dehydration agents with a concentration of 50°Brix; immersion time for 30 min at temperature a 30°C; and freeze-drying time of 24 h. Results of each treatment in terms of physical quality parameters (color of skin fruit (L*a*b*), change of color (ΔE), and hardness) and phytochemical quality parameters (water content, vitamin C, total phenolic content, and antioxidant activity by DPPH) were compared and discussed. The osmotic dehydration process causes a water loss of 13%, has a significant difference on the parameters of colors (redness and color of change), hardness, vitamin C, total phenolic content, and antioxidant activity by DPPH.

Effect of osmotic dehydration with different osmosis agents on water status, texture properties, sugars, and total carotenoid of dehydrated yellow peach slices.

The water status, texture properties, sugars, and total carotenoid of dehydrated yellow peach slices pretreated with or without osmotic dehydration (OD) combined with heat pump drying were studied. In this study, different osmotic agents were used, namely, sucrose and isomaltooligosaccharide (IMO) with 30 °Brix for 1, 3, and 5h. Results showed that the dehydrated samples pretreated by sucrose-OD with the best shape and cell structure showed lower hardness compared to the dehydrated yellow peach slices with IMO-OD pretreatment and without OD pretreatment. Notably, the highest total carotenoid content was found in dehydrated yellow peach slices pretreated by IMO-OD, followed by samples without OD, and samples with sucrose-OD pretreatment. In addition, the lowest aW (0.517) was obtained in samples with IMO-OD for 5h, which was beneficial for storage. The assessment of water status and total carotenoid content of dehydrated yellow peach slices showed that IMO-OD pretreatment could better improve the quality of dehydrated fruits. Moreover, the use of IMO in OD treatment was a good alternative to sucrose.

Effect of Sun Drying on Osmotic Dehydration of Beetroot (Beta vulgaris L.)

An Experiment was conducted at the Postharvest laboratory, Department of Horticulture entitled with “Effect of osmotic dehydration of beetroot (Beta vulgaris L.) under sun drying” during the year 2021-2022 to determine the effect of sun drying on osmotic dehydration of beetroot slices for its evaluation of physio-chemical contents, shelf life, and sensory evaluation during total 60 days of storage period and to work out on the economics In this study, 10 treatments with varying amounts of salt, honey, sugar, and K2S2O5 were used, with 4 replications (10 days, 30 days, 45 days, and 60 days) of storage periods at ambient temperature. On the basis of results obtained during the investigation the best osmotic agent for drying of beetroot slice was T7 Treated beetroot slices (Sugar 200g/Kg + K2S2O5 0.5%) + Sun drying of beetroot slices) with pH (6.30), TSS (11.46), fat content (0.28), Protein content (2.41), weight (92.5g). T7 (Treated beetroot slices (Sugar 200g/Kg + K2S2O5 0.5%) + Sun drying of beetroot slices) was found to have the highest value for reducing sugar content, Flavour and Taste score, and overall acceptability. Treatment T7 also had the highest benefit-cost ratio (1.94).

Effect of Osmotic Dehydration as a Pre -Treatment on Air Fried Sweet Potato (Ipomoea batatas) Chips

Air frying is a modern frying technique that promises low oil content of fried products. However, the main limitation of air frying is that it requires a longer operating time than deep fat frying. Previous studies found that osmotic dehydration is beneficial as frying pre-treatment to improve the quality of fried products and reduce frying time, but to date, there is no study investigating its application in air frying. Therefore, this study aims to examine the effect of osmotic dehydration as pre-treatment on the quality of air-fried sweet potato chips. Sweet potatoes were cut into slices with the same thickness, and then soaked in distilled water, 5% sodium chloride solution, and 10% sodium chloride solution for one hour. The potato slices were then air fried at two temperatures: 160˚ and 180˚C for 3, 6, 9, 12, and 15 minutes. Then, moisture content, colour, texture, diameter shrinkage and thickness expansion were analysed. The moisture content of air fried chips decreased with the increasing of frying time. The osmo-dehydrated sample showed lower moisture content which could the reduce frying time from 12 mins to 9 mins at 160ºC. Osmo-dehydrated sweet potato slices produce paler chips, but the treatment preserved the red and yellow colour of the sample. Air fried sweet potatoes that were osmotically dehydrated samples shrank more in diameter than the control samples. The increased thickness of chips was caused by crust formation and the bubbles formed at the surface due to the barrier formed by the tight surface, resulting in vapour expansion inside the pores of the chips. The hardness of pre-treated chips increased significantly with decreasing moisture content. Using osmotic dehydration pre-treatment in the air frying process can yield promising results in less frying time and better retention in terms of red and yellow colour.

Microwave drying of sweet potato: Drying kinetics and energetic analysis

The shelf life of the sweet potato is short due to its high water activity. Therefore, preservative techniques are mandatory. In this sense, the effects of osmotic dehydration (OD) as pretreatment, two different osmotic agents (OA), sucrose and sorbitol, and microwave power density (PD) on the drying kinetics of sweet potato slices (SPS) were studied. The SPS were immersed (pretreated) or not (untreated) in an osmotic solution at aw = 0.900. The samples were placed in the microwave and the drying proceeded until the moisture content was 0.20 ± 0.02 kg water/kg. The results showed that drying time, effective diffusivity, and specific energy consumption (SEC) increased with both increasing the microwave PD and employing OD. The effective diffusivity and SEC ranged from 5.701 × 10-10 to 5.218 × 10-9 m2/s and from 7.702 MJ/kgwater to 15.608 MJ/kgwater, respectively. An adapted model was achieved for describing the drying behavior and presented suitable adjustments. According to the results, 10W/g - sucrose must be selected for drying SPS. Drying time, SEC and η at this level were 480 s, 7.702 MJ/kgwater and 29.30%, respectively

Effect of Osmotic Dehydration on Drying Method and Physicochemical Properties of Pineapple (Ananas comosus. var. Queen)

Osmotic dehydration in pineapple cubes by using sucrose solution is able to improve the quality like colour, aroma, texture, appearance as well as overall acceptability. The physico-chemical properties of the product were evaluated during the experiment. There were significant differences among different treatments. The range of recovery % (13.210%-14.780%), TSS°Brix (54.52°Brix-75.40°Brix), reducing sugars % (30.14%-39.80%), non-reducing sugars % (14.67%-43.70%), total sugars (50.20%-73.85%), acidity% (1.45%-1.67%), pH (3.32-3.95), ascorbic acid % (25.1%-35.1%) moisture% (9.95-15.90%), weight loss % (10.25%-32.04%), solid gain % (11.87%-18.65%), dehydrated yield % (13.02%-14.95%), dehydration ratio (6.75-7.77), rehydration ratio (1.23-1.71) were observed.

Effect of osmotic dehydration pre‐treatments on physicochemical and energy parameters of Kosia (Nashi) pear slices dried in a convective oven

In this study, the effects of osmotic dehydration pre-treatments in sucrose solutions on dried Kosia pear slices were determined. The effective diffusion, modeling, color, rehydration, specific energy consumption, specific moisture extraction rate (SMER), evaporation latent heat, energy efficiency (EE), convective heat (hc), and mass transfer coefficient (hm) parameters of fruit slices were investigated. The shortest drying time (17 h) was observed in the drying process of the samples subjected to osmotic dehydration in 25% sucrose solution for 1 h. The best thin-layer drying models were identified as Lewis (R2: .9977) and Jane-Das (R2: .9977) models. Effective diffusion values ranged between 2.13–4.94 × 10−5 m2 s−1. Rehydration ratios ranged between 2.09 and 2.71 g g−1 while rehydration capacities ranged between 57.24% and 63.05%. The least color change was observed in control samples. SMER values of the dried samples ranged between 0.0062–0.00011 kg kWh−1. EE values ranged between 4.19% and 0.03%. Mass transfer coefficient values varied between 1.57 × 10−8 and 1.06 × 10−12 m/s. Heat transfer coefficient value was calculated as 5.773 × 10−7 W m−2 K. Uncertainty that stems from measurements and cannot be controlled was calculated as ±2.324%. Novelty impact statement High sucrose solution ratios of drying pre-treatments reduced the drying time of Kosia pear slices. Control samples retained their color values better. Samples subjected to osmotic dehydration in 25% sugar solution for 1 h had is the optimum values drying performance and energy parameters.

Effect of Osmotic Dehydration Pretreatment on the Drying Characteristics and Quality Properties of Semi-Dried (Intermediate) Kumquat (Citrus japonica) Slices by Vacuum Dryer.

The effect of osmotic dehydration (OD) pretreatments at different temperatures and immersion times on drying characteristics, total phenolic content (TPC), total antioxidant activity (TAA) (DPPH and CUPRAC methods), and color of kumquat slices dried under vacuum conditions (70 °C-100 mbar) was investigated. The OD pretreatment was performed in a sucrose solution (45 °Bx) at the temperatures of 40 and 50 °C and immersed at times of 30, 60, and 90 min. OD before vacuum drying decreased the total required drying time by up to 70 min compared to the control non-pretreated samples. Page, Modified Page, Henderson Pabis, and Two Terms Exponential models were found to satisfactorily describe the drying behavior of thin layer dried kumquat slices. The minimum and maximum values of effective moisture diffusivity (Deff) for semi-dried kumquat slices were 5.04 × 10−8 to 7.19 × 10−8, respectively. OD treatments induced a decline in TPC (5.30–33.92%) and TAA (23.63–59.34% and 4.17–31.67% for DPPH and CUPRAC assays, respectively) of kumquat slices. It was observed that OD pre-treatment can decrease the gross drying time, and make the color and sensorial attributes of dried kumquats better.

SHAPING PROPERTIES OF HELIANTHUS TUBEROSUS L. JERUSALEM ARTICHOKE TOPINAMBU SNACK PRODUCED BY OSMOTIC DEHYDRATION AND DRYING METHODS

Background. Growing consumer awareness of food consumption and expectations related to its quality and health of food in a daily diet, including for people with various health problems, point to the need to look for new directions in food production, such as dried Jerusalem artichoke snacks. The aim of the work was to examine the effect of osmotic dehydration and drying methods on the selected properties of dried Jerusalem artichoke. The research material comprised Jerusalem artichoke tubers. Fresh Jerusalem artichoke, initially dehydrated in an osmotic dehydration process in 60 % sucrose solution at 50 °C for 1 h, was dried by means of convection, microwave-convection, microwave-vacuum and freeze-drying. Results and conclusion. Freeze-dried samples, both with and without pre-treatment, reached the lowest value of water activity. At the same time, they were characterized by the highest content of dry matter. Compared to the raw material, the dehydration and drying of Jerusalem artichoke reduced the total polyphenol content and antioxidant activity. High values of both indices (176 ÷ 183 mg GAE/100 g d.m./ EC50 = 4.4 ÷ 4.6 mg d.m./cm3 ), slightly lower than in the raw material, were found in convective and microwave-vacuum dried samples. Using osmotic dehydration and selecting a method of drying Jerusalem artichoke allows to shape the properties of the obtained dried snacks with health-promoting properties. Microwave-vacuum drying proved to be particularly useful, mainly due to the short time of the process and the preservation of polyphenolic compounds and high antioxidant activity compared to freeze-dried products, considered to be a standard.

Effect of osmotic dehydration combined with citric acid on bioactive compounds in freeze-dried MD2 pineapple

The use of freeze drying process to prolong the shelf life of food products is considered mainstream in food industries due to its capability to retain the nutritional value. Citric acid and osmotic solution were used as a pre-treatment in this study to produce high-quality dried products. Four treatment groups were observed, including untreated (control), 1% citric acid (CA), 1% CA with 20% sugar solution (CAOD 20%), and 1% CA with 60% sugar solution (CAOD 60%). Physical properties such as moisture content; pH; total soluble solid; colour value; and bioactive compounds, such as vitamin C, total phenolic content (TPC), total flavonoid content (TFC), and antioxidant activities were evaluated in freeze-dried pineapples. The result showed that CAOD 60% demonstrated a positive effect, with the least moisture content and the lowest value of colour changes (ΔE) at 5.69 ± 0.04% and 33.76 ± 2.17, respectively, as compared with that of other samples. In terms of phytochemical, the control and CA groups recorded higher retention of vitamin C, TPC, and TFC compared with other osmotic dehydration samples; however, there was no significant effect (p<0.05) on TPC and TFC. Interestingly, CAOD 60% possessed strong antioxidant activity, with the lowest IC50 value of 85.85 ± 5.93. From these findings, it was found that CAOD 60% resulted in positive effect on both the physical qualities and preservation of antioxidant activity, making it a recommended condition for pre-treatment in fruit preservation, which is essential in ensuring both the food security aspect and maintenance of its nutritional value.

Pretreatment effect of osmotic dehydration on ultrasound‐assisted solvent extraction: Functional properties of defatted hazelnut meal

This study aimed to investigate the impact of ultrasound and osmotic dehydration on the functional properties of defatted hazelnut meal. The results showed that osmotic dehydration sample pretreatment did not significantly affect the functional properties of defatted meal based on p-value analysis. However, the parameters in extraction process significantly affect (p < .05) the functional properties of defatted meal. The ultrasound amplitude, solvent-to-solid ratio, and extraction temperature at highest settings in the extraction process could affect the protein content (from 29 to 33%), water-holding capacity (from 1.1 to 1.7%) and emulsifiability (from 1 to 1.4%) but negatively affect the fat-binding capacity (from 74 to 72%) of defatted meal. It was found that defatted meal extracted from higher setting on parameters is suitable for foods with high juiciness and tenderness requirement while defatted meal extracted from lower setting of parameters is suitable for milk-based beverages. Practical applications Most of the reported articles were focused on investigating the effects of processing parameters on oil yield and quality, but only limited information was given about the defatted meal after the oil extraction process. The defatted meal obtained after the extraction process can be considered as another valuable side product due to its high protein content. The meal could be very useful for various applications in food and beverage industry depends on its characteristics. Therefore, this paper aims to investigate the effects of osmotic pretreatment and ultrasound treatment on the functional properties of defatted hazelnut meal.

The effect of osmotic dehydration before drying on the physicochemical and sensorial characteristics of dried onion slices

The effect of osmotic dehydration before drying on the physicochemical and sensorial characteristics of dried onion slices

Evaluation of the effect of osmotic dehydration with peppermint syrup and coating with basil seed gum on physicochemical and microbial properties of banana chips

بررسی اثر آب‌زدایی اسمزی با شربت سکنجبین و پوشش‌دهی با صمغ دانه ریحان روی خواص فیزیکوشیمیایی و میکروبی چیپس موز

Osmotic dehydration under low agitation laminar flow condition: Effect on dielectric properties of broccoli stalk slices at 2.45 GHz

AbstractThe variation in dielectric constant, ε′ and the loss factor, ε″ of broccoli stalk slices after osmotic dehydration process conducted under continuous solution circulation with low agitation laminar flow condition was studied using open‐ended coaxial probe technique at 2.45 GHz. The results showed that both ε′ and ε″ were significantly influenced by all the osmotic dehydration operating variables. The relationship of osmotic dehydration operating variables on the dielectric properties of the broccoli stalk slices could be established by second‐order polynomial model, with the coefficient of determination higher than .9. Compared to fresh sample, the ε′ decreases and ε″ increases when broccoli stalk is subjected to the osmotic dehydration pretreatment under its optimum conditions of mass transfer exchange process. Higher dissipation factor with shorter penetration depth was obtained after osmotic pretreatment, which could facilitate absorption of energy during microwave drying of broccoli stalk slices.Practical ApplicationsDielectric properties are key factors to understand the interaction of microwaves with food materials. In recent years, there has been an increasing interest in osmotic dehydration used as pretreatment prior to microwave drying to achieve faster drying time and improves the final product quality. As osmotic dehydration process will cause a change in the dielectric properties of the food material and its ability to absorb microwaves energy, this work investigated the effects of osmotic dehydration on the dielectric properties of broccoli stalk slices at 2.45 GHz. The osmo‐pretreated sample improved the dielectric properties which result in rapid heating and therefore lead to fast drying process. The information provided in this study is helpful in the development of dried broccoli stalk slices using microwave drying.

Effects of Osmotic Dehydration on the Hot Air Drying of Apricot Halves: Drying Kinetics, Mass Transfer, and Shrinkage

This study aimed to determine the effects of osmotic dehydration on the kinetics of hot air drying of apricot halves under conditions that were similar to the industrial ones. The osmotic process was performed in a sucrose solution at 40 and 60 °C and concentrations of 50% and 65%. As expected increased temperatures and concentrations of the solution resulted in increased water loss, solid gain and shrinkage. The kinetics of osmotic dehydration were well described by the Peleg model. The effective diffusivity of water 5.50–7.387 × 10−9 m2/s and solute 8.315 × 10−10–1.113 × 10−9 m2/s was calculated for osmotic dehydration. Hot air drying was carried out at 40, 50, and 60 °C with air flow velocities of 1.0 m/s and 1.5 m/s. The drying time shortened with higher temperature and air velocity. The calculated effective diffusion of water was from 3.002 × 10−10 m2/s to 1.970 × 10−9 m2/s. The activation energy was sensitive to selected air temperatures, so greater air velocity resulted in greater activation energy: 46.379–51.514 kJ/mol, and with the osmotic pretreatment, it decreased to 35.216–46.469 kJ/mol. Osmotic dehydration reduced the effective diffusivity of water during the hot air drying process. It also resulted in smaller shrinkage of apricot halves in the hot air drying process.

Preparation Adlay and Black Sesame Seeds Extracts Using Osmotic Dehydration and Increasing the Stability of Extracts Using Encapsulation

Osmotic dehydration is an effective pretreatment method for preservation of herb, fruits and vegetables. This method can be conducted at low temperature so it can maintain the nutritional composition and food quality. In the present study, the effect of osmotic dehydration in 50, 60 and 70o Brix sugar solution at 40oC syrup temperature and drying air temperature (50, 60, 70 oC) on drying behavior of sample (adlay and black sesame seeds) were investigated before drying the sample and determined the percentage yield and total phenolic contents. All results from osmotic dehydration were compared with the soxhlet and maceration extraction methods. Among the three concentration of osmotic agents and drying temperature, percentage yield and total phenolic contents were higher at 70% concentration of osmotic agents and 60 oC air temperature which exhibited the total phenolic contents at 11.29±1.13 mg GAE/g extract and percentage yield of 4.36±0.34, respectively. From this osmotic dehydration, the surface morphologies of prepared bead containing sample had higher degree of surface smoothness and more spherical shape than non-sample bead and exhibited the encapsulation efficiency of micro-bead sample at 80.52 ± 0.36%.