scholarly journals The Effect of Different Solvents in Natural Dyes from Roselle (Hibiscus Sabdariffa) and Green Tea Leaves (Camellia Sinensis) for Dye-Sensitized Solar Cell

2021 ◽  
Vol 1755 (1) ◽  
pp. 012024
Author(s):  
N. A. Norhisamudin ◽  
N. Sabani ◽  
M.M. Shamimin ◽  
N. Juhari ◽  
S. Shaari ◽  
...  
Keyword(s):  
Solar Cell ◽  
Green Tea ◽  
Camellia Sinensis ◽  
Natural Dyes ◽  
Dye Sensitized Solar Cell ◽  
Hibiscus Sabdariffa ◽  
Tea Leaves ◽  
Dye Sensitized ◽  
Green Tea Leaves

scholarly journals Optimization of HIB Value Combination of Tween 60 and Span 80 on Cream Formulation of Ethanol Extract of Green Tea Leaves (Camellia Sinensis L.)

2018 ◽  
Vol 23 (3) ◽  
pp. 124
Author(s):  
Fransiska Lisa Anindya Putri ◽  
Akhmad Kharis Nugroho ◽  
Erna Prawita Setyowati
Keyword(s):  
Antioxidant Activity ◽  
Green Tea ◽  
Camellia Sinensis ◽  
Ethanol Extract ◽  
Tea Leaves ◽  
Lattice Design ◽  
Dpph Method ◽  
Green Tea Leaves ◽  
Span 80 ◽  
Tween 60

Green tea (Camellia sinensis L.) is known to have ability to protect skin against free radicals. This is supported by polyphenol compound catechin. This research aims to determine the optimum Hydrophilic-Lipophilic Balance (HLB) value of Tween 60 and Span 80 compositions on the optimum cream formula of ethanol extract of green tea leaves. Tea leaves are extracted by macerating using 70% ethanol. Catechin in extract is known from Thin Layer Chromatography (TLC) test with silica gel 60 F254 as stationary phase and ethyl acetate:aquadest:formic acid (18:1:1 v/v) as mobile phase. Antioxidant activity is determined by 2,2-Diphenyl-1-picryhydrazyl (DPPH) method and value of Inhibition Concentration 50% (IC50) is then calculated. Formula optimization using Design Expert® version 7.1.5 (DX 7) software, Simplex Lattice Design (SLD) method with two components Tween 60 and Span 80. Cream is characterized according to physical properties organoleptic, homogeneity, viscosity, pH, spreadability, adhesiveness, and cream type. The optimum formula obtained is then tested for physical stability for 4 weeks at room temperature (28±2°C) and data are statistically analyzed using one-way ANOVA. The extract contains catechin proved with Retention factor (Rf) value 0.8 and has antioxidant activity with IC50 value 56.35 ppm. 6.4% Tween 60 and 3.6% Span 80 result an optimum HLB value 11.1. It has viscosity 2897.50±35.94 mPa.s, spreadability 18.44±0.06 cm2, adhesiveness 0.85±0.05 seconds, and pH 4.530±0.002. Statistical test shows that the cream is significantly altered at pH, but does not significantly change in viscosity, spreadability, and adhesiveness after being stored for 4 weeks.

scholarly journals Constituents of the Green Tea Seeds of Camellia sinensis

2011 ◽  
Vol 6 (3) ◽  
pp. 1934578X1100600
Author(s):  
Toshio Hasegawa ◽  
Kensuke Akutsu ◽  
Yasuhiro Kishi ◽  
Kouji Nakamura
Keyword(s):  
Mass Spectrometry ◽  
Fatty Acid ◽  
Nmr Spectroscopy ◽  
Green Tea ◽  
Camellia Sinensis ◽  
Spectroscopic Analysis ◽  
Methanol Extract ◽  
Tea Leaves ◽  
Hexane Extracts ◽  
Green Tea Leaves

Green tea ( Camellia sinensis) leaves are known to contain active ingredients such as catechins and caffeine, and are widely useful materials. Recently, green tea flowers also have been in the spotlight. However, little attention has been paid to the tea seeds. In this work, the constituents of green tea seeds and green tea leaves were compared. Caffeine was found in the seeds, whereas catechins (usually obtained from green tea leaves) were not observed. Next, we investigated the constituents of hexane extracts and methanol extracts of green tea seeds. We found that the hexane extracts contained high amounts of oleic glyceride (79.9%) in addition to linoleic glyceride (20%). We confirmed the structures of these glycerides by NMR spectroscopy and by synthesis from a fatty acid and glycerol. The methanol extract was found to contain naringenin glucosides by mass spectrometry and NMR spectroscopic analysis.

scholarly journals Pengaruh Pasta ZnO dengan Penambahan Dish Detergent dan PVA pada Kaca Konduktif terhadap Efisiensi Dye Sensitized Solar Cell dari Ekstrak Bunga Rosela (Hibiscus sabdariffa L.)

2013 ◽  
Vol 16 (3) ◽  
pp. 90-96 ◽  
Author(s):  
Sri Handayani ◽  
Gunawan Gunawan ◽  
Abdul Haris
Keyword(s):  
Solar Cell ◽  
Counter Electrode ◽  
Dye Sensitized Solar Cell ◽  
Hibiscus Sabdariffa ◽  
Dye Sensitized ◽  
Working Electrode

Telah dilakukan penelitian tentang pembuatan pasta ZnO dengan penambahan dish detergent dan PVA pada kaca konduktif terhadap efisiensi dye sensitized solar cell (DSSC) dari ekstrak bunga rosela (Hibiscus sabdariffa L.). Penelitian ini bertujuan untuk menghasilkan lapisan ZnO nanopori dan untuk mengetahui pengaruh pembuatan pasta ZnO dengan penambahan dish detergent dan PVA terhadap efisiensi dye sensitized solar cell (DSSC). Penelitian dilakukan dengan pembuatan elektroda kerja (working electrode) dari lapis tipis ZnOyang mengadsorb antosianin bunga rosela, elektroda perlawanan (counter electrode) dari karbon dan elektrolit I-/I3- sebagai pasangan redoks. Karakterisasi DSSC meliputi serapan panjang gelombang zat pewarna bunga rosella, kristalinitas ZnO, struktur morfologi lapis ZnO dan karakteristik ikatan antara ZnO dengan senyawa antosianin. Nilai efisiensi DSSC ditentukan dengan metode kurva arus dan tegangan. Hasil penelitian dapat diperoleh lapisan ZnO berukuran nanopori sebesar 71,43 nm, dan efisiensi DSSC yang diperoleh untuk ZnO dengan dish detergent sebesar 2,964 x 10-4% sedangkan ZnO dengan PVA diperoleh efisiensi sebesar 0,712 x 10-4%.

Dye Sensitized Solar Cell Using Natural Dyes as Chromophores - Review

2013 ◽  
Vol 771 ◽  
pp. 39-51 ◽  
Author(s):  
I. Jinchu ◽  
C.O. Sreekala ◽  
K.S. Sreelatha
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Absorption Coefficient ◽  
Metal Oxide ◽  
Organic Dyes ◽  
Dye Sensitized Solar Cells ◽  
Solar Spectrum ◽  
Natural Dyes ◽  
Dye Sensitized Solar Cell ◽  
Dye Sensitized

The molecular dye is an essential component of the Dye sensitized solar cell (DSSC), and improvements in efficiency over the last 15 years have been achieved by tailoring the optoelectronic properties of the dye. The most successful dyes are based on ruthenium bipyridyl compounds, which are characterized by a large absorption coefficient in the visible part of the solar spectrum, good adsorption properties, excellent stability, and efficient electron injection. However, ruthenium-based compounds are relatively expensive, and organic dyes with similar characteristics and even higher absorption coefficients have recently been reported; solar cells with efficiencies of up to 9% have been reported. Organic dyes with a higher absorption coefficient could translate into thinner nanostructured metal oxide films, which would be advantageous for charge transport both in the metal oxide and in the permeating phase, allowing for the use of higher viscosity materials such as ionic liquids, solid electrolytes or hole conductors. Organic dyes used in the DSSC often bear a resemblance to dyes found in plants, fruits, and other natural products, and several dye-sensitized solar cells with natural dyes have been reported. This paper gives an over-view of the recent works in DSSC using the natural dyes as chromophores.

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