scholarly journals The Study of Sorption Characteristics of Dried Crab Stick Product Using Dynamic Vapor Sorption

2021 ◽  
Vol 18 (13) ◽  
Author(s):  
Traiphop PHAHOM
Keyword(s):  
Relative Humidity ◽  
Moisture Content ◽  
Sorption Isotherm ◽  
Vapor Sorption ◽  
Dynamic Vapor Sorption ◽  
Adsorption And Desorption ◽  
Peleg Model ◽  
Monolayer Moisture Content ◽  
Monolayer Moisture ◽  
Sorption Characteristics

The research delved into the sorption characteristics of dried crab stick products using dynamic vapor sorption (DVS). The obtained sorption isotherm data, including equilibrium moisture content (Me) and water activity (aw), were fitted with 6 different sorption isotherm models, such as Brunauer-Emmett-Teller (BET), Guggenheim-Anderson-Boer (GAB), Pickett-Modified BET, Adam and Shove, Blahovec-Yanniotis, and Peleg. The results showed that the Peleg model was the best-describing model with a coefficient of determination (R2), chi-square (χ2), root mean square error (RMSE), and standard error of estimate (SEE) ranging from 0.988 to 0.998, 0.719 to 4.349, 0.431 to 2.609 and 0.692 to 1.703, respectively. According to the classification of the shape of moisture sorption isotherm, the isotherm type III and II were found in this research for adsorption and desorption, respectively. The GAB and BET models were used to estimate monolayer moisture content (M0) of the sample and it was found that the M0 ranged from 3.65 to 5.36 % dry basis and 4.57 to 4.83 % dry basis for GAB and BET models, respectively. Blahovec-Yanniotis’s model was applied in this work to investigate the contribution of water and the result showed that the contribution of solution water played a major in the moisture changes of the sample during the adsorption and desorption process. Moreover, sorption isotherm data were modeled with 0 and 1st order reaction kinetics, and the results demonstrated that 0 order and 1st order models were the most appropriate model to describe moisture changes behavior of the sample at each relative humidity step for adsorption and desorption, respectively. HIGHLIGHTS The construction of sorption isotherms of dried crab stick product using dynamic vapor sorption GAB and BET models were used to estimate monolayer moisture content Peleg model was the most appropriate model to describe sorption behaviors of dried crab stick product Blahovec-Yanniotis provided the contribution of water information of dried crab stick during adsorption and desorption processes The application of reaction order kinetics could provide the information of moisture changing behaviors at each relative humidity step for adsorption and desorption processes GRAPHICAL ABSTRACT

scholarly journals Moisture Sorption Characteristics and Storage Study of Grape Seeds Flakes

2019 ◽  
Vol 2 (2) ◽  
pp. 91
Author(s):  
Adelina Bogoeva ◽  
Albena Durakova ◽  
Velichka Yanakieva ◽  
Bozhidar Bozadzhiev
Keyword(s):  
Relative Humidity ◽  
Moisture Content ◽  
Gravimetric Method ◽  
Sorption Isotherms ◽  
Grape Seeds ◽  
Storage Study ◽  
Monolayer Moisture Content ◽  
Monolayer Moisture ◽  
And Storage ◽  
Sorption Characteristics

The current scientific research is focused on the sorption isotherms, monolayer moisture content and storage study of full-fatted grape seeds flakes (FGSF) of different grape variety locally grow in Bulgaria (Mavrud, Cabernet Sauvignon, Syrah, Merlot, Dimyat and Sauvignon Blanc). To determine the sorption characteristics of FGSF, we are used a static gravimetric method of saturated salt solution and relative humidity from 0.11 to 0.90 at three different temperatures – 10, 25 and 40°C. In the condition of constant water activity and increasing temperatures, the sorption capacity of the product decrease. We are recommend the modified Henderson model for description of sorption isotherms of FGSF. The monolayer moisture content values are obtained by linearization of Braunauer-Emmett-Teller (BET), in the range of Mmads = 2.32 ÷ 3.41, Mmdes = 2.59 ÷ 3.68. The three months storage study of samples was monitored at moisture value reduced to a value corresponded to the calculated monolayer moisture content. FGSF was packed in a co-extruded barrier film with copolymer covering for heat sealing, in the conditions for storage - temperature 18 ÷ 25°C and relative humidity 75 ÷ 85%. No living cells of pathogenic organisms (Escherichia coli, Staphylococcus aureus and Salmonella spp.) or apparent molding were detected. The flour particle size has not changed either.

scholarly journals Sorption Characteristics of Bulgarian Penny Buns (Boletus Edulis)

2020 ◽  
Vol 180 ◽  
pp. 03008
Author(s):  
Albena Durakova
Keyword(s):  
Chemical Composition ◽  
Moisture Content ◽  
Model Assessment ◽  
Physico Chemical ◽  
Bet Model ◽  
Monolayer Moisture Content ◽  
Desorption Isotherms ◽  
Monolayer Moisture ◽  
Model Linearization ◽  
Sorption Characteristics

The present study determined the sorption characteristics of Bulgarian penny buns (Boletus) for eight water activities in the 10 % 90 % range and at three temperatures, of 10 °С, 25 °С and 40 °С. The coefficients of the modified Oswin, Chung-Pfost, Halsey and Henderson models were obtained statistically. The modified Halsey model is recommended as a description of adsorption and desorption isotherms since it corresponds to the criteria for model assessment and suitability. Via BET model linearization, the values of the monolayer moisture content for water activity of aw > 0.5 and temperatures of 10 °С, 25 °С and 40 °С were established. The approximate physico-chemical composition of Bulgarian penny buns (Boletus) – moisture content – 10.80 %, protein – 32.23 %, carbohydrate 0.99 %, fat – 6.62 %, ashes – 6.20 % - was also determined.

Characteristics of Dynamics Sorption Isotherms of Date Flesh Powder Rich in Fiber

2016 ◽  
Vol 12 (5) ◽  
pp. 469-480 ◽  
Author(s):  
Mohammad Fikry ◽  
Alhussein M. Al-Awaadh
Keyword(s):  
Moisture Content ◽  
Water Activity ◽  
Sorption Isotherms ◽  
Isosteric Heat ◽  
Phoenix Dactylifera ◽  
Dynamic Vapor Sorption ◽  
Desorption Process ◽  
Adsorption And Desorption ◽  
Peleg Model ◽  
Wide Range

Abstract Dynamic vapor sorption equipment (AQUADVS) was used to determine adsorption and desorption isotherms for powder rich in fiber (PRF) produced from Palm Date flesh of Sifri cultivar (Phoenix dactylifera L.) at temperatures 25, 35 and 45 °C in a wide range of water activity (0.09–0.87). Equilibrium was achieved within 29 and 25 h for the adsorption and desorption process respectively. The obtained data were fitted to ten models (Peleg, GAB, BET, Halsey, Oswin, Smith, Modified Henderson, Adam and Shove, Modified Oswin and Modified Halsey). The results indicated that the PRF followed type III behavior. The empirical Peleg model was found to be the best to represent the experimental data in the water activity range 0.09–0.87. The isosteric heat of sorption and the differential entropy decreased by increasing the moisture content and can be predicted by polynomial functions. Glass transition temperatures (Tg) of PRF were determined. The Tg decreased as the moisture content increased and can be correlated using the Gordon and Taylor model (R2=0.976). The PRF should be stored at moisture less than 9 d.b.% and temperature less than 35 °C.

scholarly journals Study on water sorption isotherm of summer onion

2015 ◽  
Vol 40 (1) ◽  
pp. 35-51 ◽  
Author(s):  
Md Masud Alam ◽  
Md Nazrul Islam
Keyword(s):  
Moisture Content ◽  
Sorption Isotherm ◽  
Water Sorption ◽  
Moisture Sorption ◽  
Moisture Sorption Isotherm ◽  
Water Sorption Isotherm ◽  
Monolayer Moisture Content ◽  
Using Data ◽  
Monolayer Moisture ◽  
Added Salt

The water sorption characteristics of dehydrated onion and onion solutes composite by vacuum drying (VD) and air drying (AD) were developed at room temperature using vacuum desiccators containing saturated salt solutions at various relative humidity levels (11-93%). From moisture sorption isotherm data, the monolayer moisture content was estimated by Brunauer-Emmett-Teller (BET) and Guggenheim-Anderson-de Boer (GAB) equation using data up to a water activity of 0.52 and 0.93 respectively. Results showed that in case of non treated samples the monolayer moisture content values (Wo) of BET gave slightly higher values than GAB (9.7 vs 8.2) for VD, while GAB gave higher value than BET (11.0 vs 9.8) for AD. It is also seen that the treated and non treated onion slice and onion powder absorbed approximately the same amount of water at water activities below about 0.44 and above 0.44 the treated samples begin to absorb more water than the non treated samples. It was observed that 10-20% added of sugar gave no change in water sorption capacity while the amount of sorbed water increases with increasing amount added salt for mix onion product.Bangladesh J. Agril. Res. 40(1): 35-51, March 2015

scholarly journals Sorption characteristics of ready-made mixtures containing oatflakes, apples, and cinnamon

2021 ◽  
Vol 286 ◽  
pp. 03003
Author(s):  
Albena Durakova ◽  
Adelina Vasileva ◽  
Kornelia Choroleeva
Keyword(s):  
Standard Deviation ◽  
Moisture Content ◽  
Evaluation Criteria ◽  
Sorption Isotherms ◽  
Mean Relative Error ◽  
Error Standard Deviation ◽  
Monolayer Moisture Content ◽  
Monolayer Moisture ◽  
Sorption Characteristics

The present paper studies the sorption characteristics of readymade mixtures containing oatflakes – 89.5%, apples – 10%, and cinnamon – 0.5 % at the temperatures of 10°C, 25°C and 40°C and for eight water activities in the 11% - 85% range. The results obtained demonstrate that at a constant water activity, the increase in temperature is coupled with a decrease in equilibrium moisture content. The sorption isotherms of the analyzed ready-made mixture belong to Type III according to the classification of Brunauer et аl. In order to describe the isotherms following the evaluation criteria, that is mean relative error, standard deviation, and distribution of residuals, the study recommends the threeparameter modified Oswin for adsorption and the Henderson model for desorption. Via linearization of the Brunauer-Emmett-Teller model, we calculate the values of monolayer moisture content (MMC) at aw < 0.5 for both processes. For adsorption, the ММC falls within the 2.51% - 3.57% d.b. range, whereas for desorption it is within the 3.41% - 3.71% d.b. range. Temperature affects the MMC since its increase leads to a decrease in the ММC for both processes. For adsorption, at a temperature between 10°C and 40°C the ММC decreases by 1.06%, and for desorption - by 0.3%.

EFFECT OF MOISTURE CONTENT ON VIABILITY AND INFESTATION OF HULLESS TERRA OATS IN STORAGE

1979 ◽  
Vol 59 (4) ◽  
pp. 911-916 ◽  
Author(s):  
R. N. SINHA ◽  
N. D. G. WHITE ◽  
H. A. H. WALLACE ◽  
R. I. H. McKENZIE
Keyword(s):  
Relative Humidity ◽  
Moisture Content ◽  
Mite Infestation ◽  
Tyrophagus Putrescentiae ◽  
Adsorption And Desorption ◽  
Safe Storage ◽  
Moisture Contents ◽  
Seed Moisture ◽  
Effect Of Moisture

The effects of various seed moisture contents in hulless (cv. Terra) and hulled oats (cv. Random) on susceptibility to mite infestation and on mycofloral growth and germination loss were studied at weekly intervals. Fat acidity values were determined for Terra oats only after 4 wk of storage. Moisture content-relative humidity adsorption and desorption curves were determined for Terra at 22 °C and at relative humidities of 35–100%. Terra oats, which had a higher level of Penicillium infection at 90–100% RH than Random oats, lost viability more rapidly than Random. Fat acidity values of Terra increased rapidly from 35 mg KOH/100 g of seed to 87–118 mg KOH/100 g of seed, only when seeds were stored at 90–100% RH. Terra offered a more favorable substrate for the multiplication of the mites Tyrophagus putrescentiae, Acarus farris, and Lepidoglyphus destructor than did Random. With the exception of susceptibility to mite infestation, safe storage criteria are similar for hulled and hulless oats at usual moisture contents.

scholarly journals Desorption of the Exotic Fruit Jujube (Ziziphus Jujube Mill) of Bulgarian Origin

2020 ◽  
Vol 180 ◽  
pp. 03007
Author(s):  
Albena Durakova ◽  
Adelina Bogoeva ◽  
Velichka Yanakieva ◽  
Tzvetana Gogova ◽  
Kornelia Choroleeva
Keyword(s):  
Moisture Content ◽  
Dry Matter ◽  
Titratable Acidity ◽  
Model Assessment ◽  
Physico Chemical ◽  
Bet Model ◽  
Ziziphus Jujube ◽  
Monolayer Moisture Content ◽  
Monolayer Moisture ◽  
Model Linearization

The present study determined the physico-chemical parameters of the exotic fruit jujube (Ziziphus jujube mill) of Bulgarian origin – pH of 4.62, refractometric dry matter of 31.6 %, dry matter (in weight) of 36.78 %, TTA (total titratable acidity) – citric acid – of 0.67 %, 0.70 % malic acid, 65.95 % moisture, 0.78 % fibre, 1.41 % protein, 23.65 % carbohydrate, 0.24 % fat and energy value of 428.44 kJ/102.4 kcal. Equilibrium moisture content and monolayer moisture content were established for desorption concerning eight water activities in the 0.1 0.9 range and the temperatures of 10 °С, 25 °С and 40 °С. The coefficients of the modified Oswin, Chung-Pfost, Halsey and Henderson models were obtained statistically. The modified Halsey model is recommended as a description of the desorption isotherms of jujube (Ziziphus jujube mill) since it corresponds to the criteria for model assessment and suitability. Via BET model linearization, the values of the monolayer moisture content for desorption at the temperatures of 10 °С 5.41 % d.b., 25 °С – 4.65 % d.b. and 40 °С 5.08 % d.b were determined.

Evaluation of moisture diffusion in lignocellulosic biomass in steady and unsteady states by a dynamic vapor sorption apparatus

Holzforschung ◽  
2019 ◽  
Vol 73 (12) ◽  
pp. 1113-1119 ◽  
Author(s):  
Tianyi Zhan ◽  
Fengze Sun ◽  
Chao Lv ◽  
Qian He ◽  
Xuan Wang ◽  
...  
Keyword(s):  
Lignocellulosic Biomass ◽  
Sorption Isotherm ◽  
Moisture Diffusion ◽  
Chinese Fir ◽  
Moso Bamboo ◽  
Vapor Sorption ◽  
Dynamic Vapor Sorption ◽  
Building Maintenance ◽  
Two Stages ◽  
Humidity Range

Abstract To examine the methodology for determining the moisture diffusion behavior of lignocellulosic biomass in steady and unsteady states (two stages of a sorption isotherm), the diffusion coefficients in the steady and unsteady states (DSS and DUS) were investigated over a range of relative humidity (RH) from 10 to 90% using a dynamic vapor sorption (DVS) apparatus and a specifically designed cell kit. Thin samples with a thickness of 50 μm were prepared from three lignocellulosic biomasses, i.e. poplar, Chinese fir and moso bamboo. Based on Fick’s first and second laws, DSS and DUS were determined. An increase in DSS or DUS was observed with increasing equilibrium moisture content (EMC) or transient status, regardless of the lignocellulosic biomass species. The moisture-dependent DSS of poplar, Chinese fir and moso bamboo was similar to values previously reported. Chinese fir and moso bamboo exhibited the highest and the lowest DSS values, respectively, when the same EMCs were achieved. The results of this study revealed that DSS and DUS of lignocellulosic biomass (even with limited dimensions) could be determined during a sorption isotherm in a wide humidity range. Furthermore, the results are helpful for simulating moisture transport behaviors in the fields of drying, paper packaging and wooden building maintenance.

scholarly journals Desorption capacity of raw energy bars with fruits of Zizyphus jujuba Mill. - Bulgaria

2021 ◽  
Vol 286 ◽  
pp. 03002
Author(s):  
Albena Durakova ◽  
Adelina Vasileva ◽  
Tzvetana Gogova ◽  
Milena Temelkova ◽  
Rumyana Krasteva
Keyword(s):  
Moisture Content ◽  
Modified Model ◽  
Type Iii ◽  
Physico Chemical ◽  
Zizyphus Jujuba ◽  
Monolayer Moisture Content ◽  
Desorption Isotherms ◽  
Monolayer Moisture ◽  
Desorption Capacity

The current study presents a mixture for raw energy bars of fresh fruits of the exotic fruit Zizyphus jujuba Mill. with origin - Bulgaria. The physico-chemical indices of the ready mixture are analyzed. A high content of carbohydrates - 24.45% and of nourishing fiber - 22.08% is reported. The desorption capacity of the exotic mixture is examined for temperatures of 10°С, 25° and 40°С in eight watery activities from 11% to 85%. The analysis shows that the equilibrium moisture lowers with the raise of temperature in constant watery activities. The desorption isotherms are of type III according to the classification of Brunauer et al. The modified model of Halsey is recommended for the isotherms description according to the estimation criteria distribution, and the model of Oswin - as a second modified model. The values of the monolayer moisture content in aw <0.5 for temperatures 10°С - 5.46% dry basis (d.b.), 25°С - 5.72% d.b. and 40°C - 4.05% d.b. are calculated Brunauer-Emett-Teller model.

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