scholarly journals Effect of Lemon Waste Natural Dye and Essential Oil Loaded into Laminar Nanoclays on Thermomechanical and Color Properties of Polyester Based Bionanocomposites

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1451 ◽  
Author(s):  
Bàrbara Micó-Vicent ◽  
Valentin Viqueira ◽  
Marina Ramos ◽  
Francesca Luzi ◽  
Franco Dominici ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Essential Oil ◽  
Sodium Dodecyl ◽  
Color Space ◽  
Natural Dye ◽  
Potassium Sulfate ◽  
Color Properties ◽  
Calcined Hydrotalcite ◽  
Bright Yellow ◽  
Yellow Color

In this work, polyester-based nanocomposites added with laminar nanoclays (calcined hydrotalcite, HT, and montmorillonite, MMT) loaded with lemon waste natural dye (LD) and essential oil (LEO) were prepared and characterized. The optimal conditions to synthetize the hybrid materials were obtained by using statistically designed experiments. The maximum LD adsorption with HT was found using 5 wt% of surfactant (sodium dodecyl sulfate), 5 wt% of mordant (aluminum potassium sulfate dodecahydrate) and 50% (v/v) ethanol. For MMT, 10 wt% of surfactant (cetylpyridinium bromide), 5 wt% of mordant, 1 wt% of (3-aminopropyl) triethoxysilane and 100% distilled water were used. LEO adsorption at 300 wt% was maximized with MMT, 10 wt% of surfactant and 50 °C following an evaporation/adsorption process. The obtained hybrid nanofillers were incorporated in a polyester-based matrix (INZEA) at different loadings (3, 5, and 7 wt%) and the obtained samples were characterized in terms of thermal stability, tensile behavior, and color properties. HT_LEM-based samples showed a bright yellow color compared to MMT_LEM ones. The presence of lemon hybrid pigments in INZEA-based systems produced a remarkable variation in CIELAB color space values, which was more visible with increasing the nanofillers ratio. A limited mechanical enhancement and reduced thermal stability was observed with the nanopigments addition, suggesting a limited extent of intercalation/exfoliation of MMT and HT in the polymer matrix. MMT_LEM pigments showed higher thermal stability than HT_LEM ones. A significant increase in Young’s modulus of nanocomposites loaded with hybrid LEO was observed compared to the biopolymer matrix. The LEO inclusion into the nanoclays efficiently improved its thermal stability, especially for MMT.

scholarly journals Effect of Chlorophyll Hybrid Nanopigments from Broccoli Waste on Thermomechanical and Colour Behaviour of Polyester-Based Bionanocomposites

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2508
Author(s):  
Bàrbara Micó-Vicent ◽  
Marina Ramos ◽  
Francesca Luzi ◽  
Franco Dominici ◽  
Valentín Viqueira ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Sodium Dodecyl ◽  
Natural Dyes ◽  
Inorganic Filler ◽  
Synthetic Dyes ◽  
Colour Properties ◽  
Reinforcement Effect ◽  
Limited Effect ◽  
Calcined Hydrotalcite ◽  
Potential Use

Natural dyes obtained from agro-food waste can be considered promising substitutes of synthetic dyes to be used in several applications. With this aim, in the present work, we studied the use of chlorophyll dye (CD) extracted from broccoli waste to obtain hybrid nanopigments based on calcined hydrotalcite (HT) and montmorillonite (MMT) nanoclays. The synthesized chlorophyll hybrid nanopigments (CDNPs), optimized by using statistical designed experiments, were melt-extruded with a polyester-based matrix (INZEA) at 7 wt% loading. Mechanical, thermal, structural, morphological and colour properties of the obtained bionanocomposites were evaluated. The obtained results evidenced that the maximum CD adsorption into HT was obtained when adding 5 wt% of surfactant (sodium dodecyl sulphate) without using any biomordant and coupling agent, while the optimal conditions for MMT were achieved without adding any of the studied modifiers. In both cases, an improvement in CD thermal stability was observed by its incorporation in the nanoclays, able to protect chlorophyll degradation. The addition of MMT to INZEA resulted in large ΔE* values compared to HT incorporation, showing bionanocomposite green/yellow tones as a consequence of the CDNPs addition. The results obtained by XRD and TEM revealed a partially intercalated/exfoliated structure for INZEA-based bionanocomposites, due to the presence of an inorganic filler in the formulation of the commercial product, which was also confirmed by TGA analysis. CDNPs showed a reinforcement effect due to the presence of the hybrid nanopigments and up to 26% improvement in Young’s modulus compared to neat INZEA. Finally, the incorporation of CDNPs induced a decrease in thermal stability as well as limited effect in the melting/crystallization behaviour of the INZEA matrix. The obtained results showed the potential use of green natural dyes from broccoli wastes, adsorbed into nanoclays, for the development of naturally coloured bionanocomposites.

XYLANASE, AN ENVIRONMENTALLY FRIENDLY BLEACHING AGENT FOR PULP AND PAPER: Characterization And Stabilization Study Of Bacillus licheniformis I-5 CRUDE Xylanase

2018 ◽  
Vol 7 (3) ◽  
Author(s):  
Budiasih Wahyuntari., dkk
Keyword(s):  
Thermal Stability ◽  
Bacillus Licheniformis ◽  
Hot Spring ◽  
Sodium Dodecyl ◽  
Luria Broth ◽  
Crude Enzyme ◽  
Half Time ◽  
Triton X100 ◽  
Sds Page ◽  
Xylanolytic Enzymes

Isolate I-5 was isolated from Ciseeng hot spring, West Java and was identified as Bacillus licheniformis I-5. The isolate produces extracellular xylanolytic enzymes on Oatspelt containing Luria broth agar medium. Optimal activity of the crude enzyme was  observed at 50ºC and pH 7. The effect of sodium dodecyl sulphate, b-mercaptoethanol and Triton-X100 were observed. Incubating the crude enzyme in 1.5% SDS and 1.5% b-mercaptoethanol at 50oC for 90 minutes then adding Triton-X100 at final concentration of 3.5% for 45 minutes only reduced 5.75% of the initial enzyme activity. SDS/PAGE and zymogram analysis showed that at least two xylanolytic enzymes presence in the crude enzyme. The molecular weight of the enzyme was estimated about 127 and 20kD. The enzyme hydrolysed xylan into xylobiose, xylotriose and other longer xylooligosaccharides. Thermal stability of the crude enzyme was observed at 50, 60, and 70oC and pH 7 and 8. The results showed that the half time of the crude enzyme incubated at 50, 60, and 70oC pH 7 was 2 hours 55 minutes; 2 hours 33 minutes and 1 hour 15 minutes respectively. The half time at 50, 60 and 70oC, pH 8 was 2 hours 48 minutes; 1 hour 22 minutes and 1 hour 9 minutes respectively.keywords: Xilanase, Bacillus licheniformis I-5, thermal stability

Formulation, Physical and Chemical Stability of Ocimum gratissimum L. Leaf Oil Nanoemulsion

2021 ◽  
Vol 901 ◽  
pp. 117-122
Author(s):  
Netnapa Ontao ◽  
Sirivan Athikomkulchai ◽  
Sarin Tadtong ◽  
Phuriwat Leesawat ◽  
Chuda Chittasupho
Keyword(s):  
Essential Oil ◽  
Zeta Potential ◽  
Chemical Stability ◽  
Polydispersity Index ◽  
Hydrodynamic Diameter ◽  
Potential Value ◽  
Yellow Color ◽  
Leaf Oil ◽  
The Stability ◽  
Physical And Chemical

Ocimum gratissimum L. leaf oil exhibited many pharmacological properties. This study aimed to formulate and evaluate the physical and chemical stability of O.gratissimum leaf oil nanoemulsion. O.gratissimum leaf oil was extracted by hydrodistillation. The major component of the essential oil eugenol, was analyzed by UV-Vis spectrophotometry. Nanoemulsions of O.gratissimum leaf oil were formulated using polysorbate 80, hyaluronic acid, poloxamer 188, and deionized water by phase inversion composition method. The hydrodynamic diameter, polydispersity index, and zeta potential value of O.gratissimum leaf oil nanoemulsion was evaluated by a dynamic light scattering technique. The %remaining of eugenol in the nanoemulsion was analyzed by UV-Vis spectrophotometry. The essential oil extracted from of O. gratissimum leaf oil was a clear, pale yellow color. The %yield of the essential oil was 0.15 ± 0.03% v/w. The size of the nanoemulsion was less than 106 nm. The polydispersity index of the nanoemulsion was ranging from 0.303 - 0.586 and the zeta potential value of the nanoemulsion was closely to zero, depending on the formulation component. O. gratissimum leaf oil at concentrations ranging from 0.002 - 0.012% v/v contained 35 - 41% of eugenol. The size of nanoemulsion was significantly decreased after storage at 4 °C, while significantly increased upon storage at 45 °C. The size of nanoemulsion stored at 30 °C did not significantly change. The %remaining of eugenol in the nanoemulsion was more than 90% after storage at 4 °C and 30 °C for 28 days. The percentage of eugenol remaining in the nanoemulsion stored at 45 °C was more than 85 - 90%, suggesting that the temperature affected the stability of eugenol in the nanoemulsion.

Plaque Color Analysis by the Conventional Yellow-Color Grading System and Quantitative Measurement Using LCH Color Space

2007 ◽  
Vol 20 (5) ◽  
pp. 324-334 ◽  
Author(s):  
KATSUKI OKADA ◽  
YASUNORI UEDA ◽  
JOTA OYABU ◽  
NOBUYUKI OGASAWARA ◽  
ATSUSHI HIRAYAMA ◽  
...  
Keyword(s):  
Quantitative Measurement ◽  
Color Space ◽  
Grading System ◽  
Color Analysis ◽  
Color Grading ◽  
Yellow Color

scholarly journals Color and fastness properties of mordanted Bridelia ferruginea B dyed cellulosic fabric

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Jamiu Mosebolatan Jabar ◽  
Ademola Israel Ogunmokun ◽  
Tella Adewale Akanni Taleat
Keyword(s):  
Calcium Chloride ◽  
Metal Ion ◽  
Color Space ◽  
Fastness Properties ◽  
Color Strength ◽  
Bridelia Ferruginea ◽  
Yellow Color ◽  
Dyed Fabrics ◽  
Cellulosic Fabric ◽  
Dyed Fabric

AbstractBridelia ferruginea B dye was extracted from the bark of the tree using aqueous extraction method. Extracted dye was used to dye cellulosic (cotton) fabric in presence of 5% calcium chloride (CaCl2) or 5% alum (KAl(SO4)2·12H2O) of weight of fabric (o.w.f) as mordant. Fabric dyed without mordant was lighter in hue than metal ion mordanted dyed fabrics. The fabrics dyed in presence of calcium chloride as mordant are of deeper hue than those dyed with alum as mordant. Hence, their dye-uptake and color strength (K/S) are in the same order. K/S value of fabric dyed with alum is 43.71% higher than that without mordant and fabric dyed with calcium chloride has K/S value 51.09% higher than dyed with alum as mordant. CIEL*a*b* coordinate indicator and color space quadrant showed that those dyed fabrics without mordant and with alum as mordant are closer to yellow than red color. Those cellulosic fabrics dyed with calcium chloride as mordant are closer to red than yellow color as confirmed in colour space quadrant. Pre-mordanted dyed fabrics are of deeper color than post-mordanted dyed fabrics than meta-mordanted dyed fabrics than unmordant dyed fabric. Fastness properties of B. ferruginea B dyed cellulosic fabrics ranged from good (3) to excellent (5).

scholarly journals Effects of High Intensity Ultrasound on Physiochemical and Structural Properties of Goat Milk β-Lactoglobulin

Molecules ◽  
2020 ◽  
Vol 25 (16) ◽  
pp. 3637
Author(s):  
Xinhui Zhou ◽  
Cuina Wang ◽  
Xiaomeng Sun ◽  
Zixuan Zhao ◽  
Mingruo Guo
Keyword(s):  
Thermal Stability ◽  
Structural Properties ◽  
High Intensity ◽  
Structural Changes ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Goat Milk ◽  
High Intensity Ultrasound ◽  
Hydrophobicity Index ◽  
Β Lactoglobulin

This study aimed to compare the effects of high intensity ultrasound (HIU) applied at various amplitudes (20~40%) and for different durations (1~10 min) on the physiochemical and structural properties of goat milk β-lactoglobulin. No significant change was observed in the protein electrophoretic patterns by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). Deconvolution and second derivative of the Fourier transform infrared spectra (FTIR) showed that the percentage of β-sheet of goat milk β-lactoglobulin was significantly decreased while those of α-helix and random coils increased after HIU treatment The surface hydrophobicity index and intrinsic fluorescence intensity of samples was enhanced and increased with increasing HIU amplitude or time. Differential scanning calorimetry (DSC) results exhibited that HIU treatments improved the thermal stability of goat milk β-lactoglobulin. Transmission electron microscopy (TEM) of samples showed that the goat milk β-lactoglobulin microstructure had changed and it contained larger aggregates when compared with the untreated goat milk β-lactoglobulin sample. Data suggested that HIU treatments resulted in secondary and tertiary structural changes of goat milk β-lactoglobulin and improved its thermal stability.

Sodium dodecyl sulfate (SDS) effect on the thermal stability of oxy-HbGp: Dynamic light scattering (DLS) and small angle X-ray scattering (SAXS) studies

2013 ◽  
Vol 111 ◽  
pp. 561-570 ◽  
Author(s):  
José Wilson P. Carvalho ◽  
Fernanda Rosa Alves ◽  
Tatiana Batista ◽  
Francisco Adriano O. Carvalho ◽  
Patrícia S. Santiago ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Light Scattering ◽  
Sodium Dodecyl Sulfate ◽  
Dynamic Light Scattering ◽  
Small Angle ◽  
Sodium Dodecyl ◽  
X Ray ◽  
X Ray Scattering ◽  
Dodecyl Sulfate ◽  
Thermal Stability Of

Chromapedic Acid, Pulvinic Acids and Acetophenone Derivatives from the Mushroom Leccinum chromapes (Boletales)

2014 ◽  
Vol 69 (4) ◽  
pp. 432-438 ◽  
Author(s):  
Gertraud Gruber ◽  
Lydia Kerschensteiner ◽  
Wolfgang Steglich
Keyword(s):  
Bright Yellow ◽  
Pink Color ◽  
Yellow Color ◽  
Acetophenone Derivatives

The pigment responsible for the bright-yellow color of the stalk bases of Leccinum chromapes is methyl isoxerocomate, which is accompanied by lesser amounts of isoxerocomic acid and atromentic acid. In addition, 4ʹ-hydroxy- and 3ʹ,4ʹ-dihydroxyacetophenone, previously unreported as metabolites of Basidiomycetes, were isolated. The pink color of the cap skin is due to variegatorubin. This pigment is accompanied by chromapedic acid, a g-butenolide of biosynthetic interest representing a new dimerization mode of 4-hydroxyphenylpyruvic acid in Boletales.

scholarly journals Synthetic Conditions and Color Characteristics of Tantalum Oxynitride Prepared via Liquid-NH3Process

2009 ◽  
Vol 2009 ◽  
pp. 1-4 ◽  
Author(s):  
Yo Sasaki ◽  
Zentaro Tokuyasu ◽  
Yoichi Ono ◽  
Mitsunobu Iwasaki ◽  
Seishiro Ito
Keyword(s):  
Heavy Metals ◽  
Room Temperature ◽  
Color Index ◽  
Metal Halide ◽  
Color Properties ◽  
Color Characteristics ◽  
Treatment Conditions ◽  
Precursor Material ◽  
Yellow Color ◽  
Yellow Pigments

Tantalum oxynitrides, such as TaON, exhibit promising color properties and can be employed as nontoxic yellow pigments containing no heavy metals. We have developed a process for preparing nitrides or oxynitrides involving the vacuum-calcination of a precursor material obtained via reaction between a metal halide and liquidNH3. Herein, we describe the synthetic conditions of the liquid-NH3process that affect the color, and thus the color characteristics, of the resulting pigments. Reaction and postreaction treatment conditions were adjusted to obtain the desired yellow color. The liquid-NH3process was performed using 1.0 eq ofH2O(relative toTaCl5) as the oxygen source and 30.0 eq of KCl (relative toTaCl5) as flux. Calcination of the precursor at 1073 K under vacuum was followed by recalcination from room temperature to 973 K at rate of 10 Kmin−1under air. A powder with a color index ofL∗=84.20,a∗=−2.71, andb∗=44.07was obtained.

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