Freezing-Extraction/Vacuum-Drying Method for Robust and Fatigue-Resistant Polyimide Fibrous Aerogels and Their Composites with Enhanced Fire Retardancy

The present study aimed to evaluate the effect of Jerusalem artichoke processing methods and drying methods (freeze drying, sublimation drying, vacuum drying) on the basic physicochemical parameters, profiles and contents of sugars and polyphenolic compounds, and health-promoting properties (antioxidant activity, inhibition of the activities of α-amylase, α-glucosidase, and pancreatic lipase) of the produced purée. A total of 25 polyphenolic compounds belonging to hydroxycinnamic phenolic acids (LC-PDA-MS-QTof) were detected in Jerusalem artichoke purée. Their average content in the raw material was at 820 mg/100 g dm (UPLC-PDA-FL) and was 2.7 times higher than in the cooked material. The chemical composition and the health-promoting value of the purées were affected by the drying method, with the most beneficial values of the evaluated parameters obtained upon freeze drying. Vacuum drying could offer an alternative to freeze drying, as both methods ensured relatively comparable values of the assessed parameters.

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The characteristics of corn silk (Zea mays L.) herbal drinks tea with vacuum drying method as antioxidant

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/475/1/012023 ◽

2020 ◽

Vol 475 ◽

pp. 012023

Author(s):

R A Laeliocattleya ◽

E Martati ◽

A N S Alwi ◽

L P Aulia ◽

Yunianta

Keyword(s):

Zea Mays ◽

Zea Mays L ◽

Vacuum Drying ◽

Drying Method ◽

Corn Silk

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Comparative kinetic analysis of convective and vacuum dried Opuntia ficus-indica (L.) Mill. cladodes

Research in Agricultural Engineering ◽

10.17221/18/2018-rae ◽

2019 ◽

Vol 65 (No. 1) ◽

pp. 1-6

Author(s):

Anirban Dey ◽

Somya Singhal ◽

Prasad Rasane ◽

Sawinder Kaur ◽

Navneet Kaur ◽

...

Keyword(s):

Convective Drying ◽

Coefficient Of Determination ◽

Vacuum Drying ◽

Drying Methods ◽

Drying Method ◽

Statistical Parameters ◽

Drying Time ◽

Opuntia Ficus Indica ◽

Thin Layer Drying ◽

Drying Behavior

Opuntia ficus-indica (Linnaeus) Miller more usually known as fodder palm or nopal belongs to family Cactaceae. In the present study, the drying behavior of the O. ficus-indica cladodes was observed. The study concentrates on comparatively studying two types of commercial drying methods viz., forced convective drying (tray drying) and vacuum drying to dry nopal cladodes at three different temperatures viz. 40, 50 and 60°C. The equilibrium moisture contents for forced convective drying was achieved at 540–720 min and for that of vacuum drying at 600–840 min. Three mathematical drying models for thin layer drying viz. Page, Lewis and Henderson-Pabis model were evaluated for both convective drying and vacuum drying. Statistical parameters such as the coefficient of determination (R<sup>2</sup>), root mean square error and reduced χ<sup>2</sup> were used to fit the models. Page model was found to be satisfactory for both forced convective and vacuum drying of the nopal cladodes at 40 and 50°C respectively. Among these, two drying methods, forced convective drying method was found to be more suitable than the vacuum drying method for nopal cladodes on the basis of drying time and statistical parameters.

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A three‐stage microwave‐vacuum, pulsed‐vacuum, and vacuum drying method for lotus seeds

Journal of Food Processing and Preservation ◽

10.1111/jfpp.14896 ◽

2020 ◽

Vol 44 (11) ◽

Author(s):

Yuanhui Li ◽

Na Wan ◽

Zhenfeng Wu ◽

Xuecheng Wang ◽

Ming Yang ◽

...

Keyword(s):

Vacuum Drying ◽

Drying Method

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Effect of Carrier Lipophilicity and Preparation Method on the Properties of Andrographolide–Solid Dispersion

Pharmaceutics ◽

10.3390/pharmaceutics11020074 ◽

2019 ◽

Vol 11 (2) ◽

pp. 74 ◽

Cited By ~ 2

Author(s):

Guowei Zhao ◽

Qingyun Zeng ◽

Shoude Zhang ◽

Youquan Zhong ◽

Changhao Wang ◽

...

Keyword(s):

Surface Morphology ◽

Dissolution Rate ◽

Solid Dispersion ◽

Preparation Method ◽

Water Soluble ◽

Vacuum Drying ◽

Dissolution Behavior ◽

Drying Method ◽

Carrier Material ◽

Poorly Water Soluble

Solid dispersion (SD) is a useful approach to improve the dissolution rate and bioavailability of poorly water-soluble drugs. This work investigated the effects of carrier material lipophilicity and preparation method on the properties of andrographolide (AG)–SD. The SDs of AG and the carrier materials, polyethylene glycol (PEG) and PEG grafted with carbon chains of different length (grafted PEG), have been prepared by spray-drying and vacuum-drying methods. In AG–SDs prepared by the different preparation methods with the same polymer as carrier material, the intermolecular interaction, 5% weight-loss temperature, the melting temperature (Tm), surface morphology, crystallinity, and dissolution behavior have significant differences. In the AG–SDs prepared by the same spray-drying method with different grafted PEG as carrier material, Tm, surface morphology, crystallinity, and dissolution behavior had little difference. In the AG–SDs prepared by the same vacuum-drying method with different grafted PEG as carrier material, the crystallinity and Tm decreased, and the dissolution rate of AG increased with the increase of grafted PEG lipophilicity. The preparation method has an important effect on the properties of SD. The increase of carrier material lipophilicity is beneficial to the thermal stability of SD, the decrease of crystallinity and the increase of dissolution rate of a poorly water-soluble drug in the SD.

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Collaborative Study of the Determination of Soluble Solids in Tomato Products by Refractive Index Expressed as Per Cent Sucrose

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/52.5.1050 ◽

1969 ◽

Vol 52 (5) ◽

pp. 1050-1054

Author(s):

Frank C Lamb ◽

George Evans

Keyword(s):

Refractive Index ◽

Enzyme Preparation ◽

Collaborative Study ◽

Soluble Solids ◽

Vacuum Drying ◽

Equal Weight ◽

Drying Method ◽

Filtration Method ◽

Tomato Products

Abstract A collaborative study was conducted on a method for determining refractive index of tomato concentrates after filtration. A pectic enzyme preparation in dry form is added to undiluted concentrate to facilitate filtration and an optional incubation step is included for samples which are difficult to filter. Dilution with an equal weight of water containing the enzyme preparation is specified for samples which cannot be filtered satisfactorily without dilution. Standard deviations varied from 0.15% for a sample giving a reading of 24% sucrose at 20°C to 0.40% for a sample reading 44%. This agreement is comparable to that previously obtained on the official vacuum drying method. Results are reported from two laboratories using ultracentrifugation methods for obtaining clear serum. It is recommended that the filtration method be adopted as official first action and that the ultracentrifuge method be further studied.

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The application of dynamic modelling technique on the pipeline drying operation during pre-commissioning

The APPEA Journal ◽

10.1071/aj19144 ◽

2020 ◽

Vol 60 (2) ◽

pp. 606

Author(s):

Diwu Chen ◽

Andrew Duff ◽

John Willcocks

Keyword(s):

Gas Injection ◽

Vacuum Pump ◽

Vacuum Drying ◽

Residual Water ◽

Drying Method ◽

Pump Performance ◽

Dry Air ◽

Simultaneous Operations ◽

Pipeline Networks ◽

Drying Efficiency

The objective of pipeline drying during pre-commissioning is to remove residual water left in the pipeline after dewatering and desalination operations. Removing the residual water mitigates corrosion and hydrate formation and aids quicker delivery of product to required dryness. The common pipeline drying methods are vacuum drying and convection drying. The convection drying method blows dry air through the pipeline to remove the residual water. Its disadvantages are an inability to adequately dry complex-shaped pipeline networks, significant equipment footprint and expelling air noise during the convection drying operation. The vacuum drying method can achieve low dewpoints particularly for complex-shaped pipeline networks and the equipment footprint can also be smaller than for the convection drying method. Therefore, it is advantageous when facing space restrictions for equipment. This paper introduces a dynamic integrated model to simulate the pipeline drying operation. This model considers vacuum pump performance and gas saturation condition in the pipeline during the drying operation. The modelling results can be used to determine the vacuum drying suitability, predict the drying operation duration and identify opportunities to improve the pipeline drying efficiency, such as vacuum pump performance, dry gas injection and convection dry air flow rate. It also demonstrates where vacuum drying is unlikely to be feasible, i.e. low ambient temperature conditions, and methods for identifying such. An optimisation case study is also presented. The drying duration can be reduced significantly by integrating vacuum drying with dry gas injection. This combined methodology can thus significantly improve the pipeline vacuum drying efficiency, which reduces the project cost and improves and de-risks scheduled and simultaneous operations.

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