A novel evaporation detection system using an impedance sensing chip

Lin, Yung‐Sheng; Chen, Cheng-You

doi:10.1039/c4an01107d

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…In this assay, the volatilization rates of DI water, 5% glycerine, 10% glycerine, and the SCG extract solution (37 mg SCG/mL) were compared to investigate their moisturizing abilities. Figure 8 compares the volatilization rates of these four substances and reveals that DI water had the highest volatilization rate [26]; 5% glycerine, 10% glycerine, and the SCG extract solution all had relatively low volatilization rates, implying that glycerine and the SCG extract solution exhibited effective moisturizing ability. e volatilization rate of the SCG extract solution lie between those of 5% and 10% glycerine and was 15.9% lower than that of DI water.…”

Section: Moisturizing Abilitymentioning

confidence: 99%

Functionality Analysis of Spent Coffee Ground Extracts Obtained by the Hydrothermal Method

Agrawal

Huang

et al. 2019

Journal of Chemistry

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Coffee is a popular beverage all over the world, but spent coffee grounds (SCGs) constituting almost 75% of original beans are usually considered waste and disposed off. e present study analyzed the functionalities of SCG with a view of its reuse in the cosmetic industry. e SCG extraction was carried out by the hydrothermal method. e resultant extracts were tested for its antioxidant capacity, tyrosinase inhibition, and moisturizing ability. LC-MS/MS results showed two major components in SCG extracts, namely, trigonelline and caffeine. Also, the SCG contained total flavonoid contents of 29 ± 4.5 mg quercetin equivalents (QE)/g SCG and total phenolic contents of 9.44 ± 0.90 mg gallic acid equivalents (GAE)/g SCG. Regarding functionality analysis, SCG extracts exhibited reduction capacity of 8.18 ± 0.39 mg vitamin C equivalent (VCE)/g SCG, DPPH free-radical scavenging activity (IC 50 ) of 3.11 mg SCG/mL, ABTS free-radical scavenging activity (IC 50 ) of 13.61 mg SCG/mL, and tyrosinase inhibition capacity (IC 50 ) of 2.23 mg SCG/mL. Moreover, the volatilization rate of the extract solution (37 mg SCG/mL) reduced by 15.9%. ese results demonstrate the utility of recycling of SCG and illustrate its potential application in the development of skin care products.

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Section: Moisturizing Abilitymentioning

confidence: 99%

Functionality Analysis of Spent Coffee Ground Extracts Obtained by the Hydrothermal Method

Agrawal

Huang

et al. 2019

Journal of Chemistry

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“…Among these methods, gravimetric analysis can be easily applied to measure the weight change of an analyte in a material through evaporation within a specific period; a low level of weight loss indicates high moisture retention. However, because of the detection limit of balance machines used for gravimetric analysis, considerable time is required for accumulating detectable weight changes in order to measure a solution’s evaporation rate, which is an indicator of the solution’s moisture-retention 10 . Therefore, in gravimetric analysis, obtaining accurate evaporation rates is a time-consuming process 11 .…”

Section: Introductionmentioning

confidence: 99%

Moisture retention of glycerin solutions with various concentrations: a comparative study

Chen

Lee

Chen

et al. 2022

Sci Rep

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Various methods of evaluating a humectant’s moisture retention have unique mechanisms. Hence, for designing advanced or efficient ingredients of cosmetic products, a clear understanding of differences among methods is required. The aim of this study was to analyze the moisture-retention capacity of glycerin, a common ingredient in cosmetic products. Specifically, this study applied gravimetric analysis, transepidermal water loss (TEWL) analysis, and differential scanning calorimetry (DSC) to examine the evaporation of glycerin solutions of different concentrations. The results revealed that the moisture-retention capacity of glycerin increased with the glycerin concentration from 0 to 60 wt%, and glycerin at concentration of 60–70 wt% did not exhibit weight change during the evaporation process. When the glycerin concentration exceeded 70 wt%, moisture sorption occurred in the glycerin solution. Furthermore, the results revealed a deviation between the evaporation rates measured using gravimetric analysis and those measured using TEWL analysis. However, normalizing the results of these analyses yielded the relative evaporation rates to water, which were consistent between these two analyses. DSC thermograms further confirmed the consistent results and identified two hydrated water microstructures (nonfreezable water and free water) in the glycerin solutions, which explained why the measured evaporation rate decreased with the glycerin concentration. These findings can be applied to prove the moisture-retention capacity of a humectant in cosmetic products by different measuring methods.

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Selective infiltration and storage of picoliter volumes of liquids into sealed SU-8 microwells

Prokop¹,

Schmalz²,

Karnutsch³

2016

Optofluidics, Microfluidics and Nanofluidics

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This paper describes the selective infiltration and storage of picoliter volumes of water and IPA in arrays of sealed SU-8 microwells. Microwells, with a volume of approximately 300 picoliters, are fabricated employing photolithography and a polymer onto polymer lamination method to seal the structures with a thin cover of SU-8 and PDMS in order to suppress the evaporation of the infiltrated liquids. A glass capillary is used to punch through the SU-8/PDMS cover and to infiltrate the liquid of interest into the microwells. The influence of the mixing ratio of the PDMS and its curing agent is studied and the results show that a lower ratio of 2:1 suppresses the evaporation more when compared to the standard mixing ratio of 10:1. In regards to water and IPA, the dwell time in the reservoirs was increased by approximately 50 % and 450 % respectively. Depending on the physical properties of the microwells and the liquids, the SU-8/PDMS cover suppresses the evaporation up to 32 mins for water and 463 mins for IPA, respectively, until the microwell is completely empty again. Additionally, multiple infiltrations of the same microwell are demonstrated using two immiscible liquids IPA and paraffin oil. Based on the popular polymers SU-8 and PDMS, the sealed microwell structures are scalable and combinable with different glass capillaries according to the needs of future analytical research and medical diagnostics.

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A novel evaporation detection system using an impedance sensing chip

Cited by 4 publications

References 22 publications

Functionality Analysis of Spent Coffee Ground Extracts Obtained by the Hydrothermal Method

Functionality Analysis of Spent Coffee Ground Extracts Obtained by the Hydrothermal Method

Moisture retention of glycerin solutions with various concentrations: a comparative study

Selective infiltration and storage of picoliter volumes of liquids into sealed SU-8 microwells

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