scholarly journals Ekstraksi dan Karakterisasi Serat Selulosa dari Tanaman Eceng Gondok (Eichornia Crassipes)

FLUIDA ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 1-7
Author(s):  
Endang Kusumawati ◽  
Haryadi
Keyword(s):  
Carbon Nanodots ◽  
Eichornia Crassipes

Eceng gondok merupakan gulma air yang tumbuh pesat di perairan. Pada penelitian ini dilakukan proses ekstraksi dan karakteristik serat selulosa dari eceng gondok. Tujuan dari penelitian ini adalah mendapatkan jenis pelarut yang efektif untuk mengekstrak serat selulosa dari tanaman eceng gondok sehingga didapat konversi serat yang optimum.Kandungan batang eceng gondok yang kaya akan selulosa, hemiselulosa dan lignin berpotensi untuk dijadikan bahan dasar pembuatan carbon nanodots (C-Dots) dan kepentingan lainnya. Untuk dijadikan bahan baku C-Dots harus dilakukan pemisahan hemiselulosa dan lignin-nya karena akan berpengaruh pada proses karbonisasi, sehingga perlu dilakukan pretreatment untuk mendapatkan serat selulosa murni. Proses ekstraksi merupakan salah satu cara untuk mendapatkan serat selulosa murni.Proses ekstraksi dilakukan melalui dua tahap proses yaitu proses delignifikasi menggunakan NaOH 4% dan tahap bleaching dengan memvariasikan beberapa jenis pelarut dengan konsentrasi yang seragam, dalam penelitian ini digunakan NaClO2, H2O2 dan HCl masing-masing 3%. Selulosa yang diperoleh dikarakteristik menggunakan FTIR dan HPLC sehingga diperoleh gugus fungsi dan jumlah lignin yang terdapat dalam residu.Pelarut terbaik ditinjau dari berat selulosa yang dihasilkan dan analisis FTIR dan HPLC adalah NaOH 4% NaClO2 3%.Berat selulosa yang dihasilkan lebih banyak dari kedua variasi pelarut lainnya.Analisis FTIR tidak mendeteksi adanya gugus fungsi senyawa lignin pada selulosa.Analisis HPLC diperoleh selulosa lebih murni dari kedua variasi yaitu sebesar 77,6%. Hal ini menunjukkan bahwa produk selulosa yang dihasilkan dari proses ekstraksi dengan pelarut tersebut efektif serta  memiliki kemurnian yang tinggi.

scholarly journals Study of carbon nanodots from water hyacinth (Eichornia crassipes) to degrade textiles dyes of skycion yellow HE-4R

2019 ◽  
Vol 509 ◽  
pp. 012013
Author(s):  
Endang Kusumawati ◽  
Anggi Regiana Agustin ◽  
Emmanuella Widiyanti ◽  
Arina Nurul Hayati ◽  
Driyarta Lumintu
Keyword(s):  
Water Hyacinth ◽  
Carbon Nanodots ◽  
Eichornia Crassipes

scholarly journals Influence of Nitrogen-Doped Carbon Dot and Silver Nanoparticle Modified Carbon Paste Electrodes on the Potentiometric Determination of Tobramycin Sulfate: A Comparative Study

Chemosensors ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 52
Author(s):  
Nermine V. Fares ◽  
Passant M. Medhat ◽  
Christine M. El Maraghy ◽  
Sherif Okeil ◽  
Miriam F. Ayad
Keyword(s):  
Silver Nanoparticle ◽  
Carbon Nanodots ◽  
Carbon Paste ◽  
X Ray Diffraction ◽  
Loteprednol Etabonate ◽  
Carbon Paste Electrodes ◽  
Transmission Electron ◽  
Nernstian Slope ◽  
Nitrogen Doped Carbon ◽  
Modified Carbon Paste Electrodes

Two inexpensive and simple methods for synthesis of carbon nanodots were applied and compared to each other, namely a hydrothermal and microwave-assisted method. The synthesized carbon nanodots were characterized using transmission electron microscopy (TEM), ultraviolet-visible (UV-Vis), photoluminescence (PL), Fourier transform-infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The synthesized microwave carbon nanodots had smaller particle size and were thus chosen for better electrochemical performance. Therefore, they were used for our modification process. The proposed electrodes performance characteristics were evaluated according to the IUPAC guidelines, showing linear response in the concentration range 10−6–10−2, 10−7–10−2, and 10−8–10−2 M of tobramycin with a Nernstian slope of 52.60, 58.34, and 57.32 mV/decade for the bare, silver nanoparticle and carbon nanodots modified carbon paste electrodes, respectively. This developed potentiometric method was used for quantification of tobramycin in its co-formulated dosage form and spiked human plasma with good recovery percentages and without interference of the co-formulated drug loteprednol etabonate and excipients.

High-Responsivity Solar-Blind Ultraviolet Photodetectors Based on Carbon Nanodots/Graphene Hybrids

2021 ◽  
Vol 68 (3) ◽  
pp. 1101-1106
Author(s):  
Yong Fang ◽  
Zhiwei Zhao ◽  
Mengru Zhu ◽  
Zhengjin Weng ◽  
Chao Fang ◽  
...  
Keyword(s):  
Carbon Nanodots ◽  
High Responsivity ◽  
Solar Blind ◽  
Ultraviolet Photodetectors

Carbon nanodots enhanced performance of Cs0.15FA0.85PbI3 perovskite solar cells

Nano Research ◽  
2021 ◽  
Author(s):  
Yu Gao ◽  
Wenzhan Xu ◽  
Fang He ◽  
Pengbo Nie ◽  
Qingdan Yang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Carbon Nanodots

Surface chemical engineering towards efficient and bright chemiluminescent carbon nanodots

2021 ◽  
pp. 149947
Author(s):  
Cheng-Long Shen ◽  
Jin-Hao Zang ◽  
Qing Lou ◽  
Guang-Song Zheng ◽  
Meng-Yuan Wu ◽  
...  
Keyword(s):  
Chemical Engineering ◽  
Carbon Nanodots ◽  
Surface Chemical

scholarly journals Anti-Inflammatory Effect and Cellular Uptake Mechanism of Carbon Nanodots in in Human Microvascular Endothelial Cells

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1247
Author(s):  
Sarah Belperain ◽  
Zi Yae Kang ◽  
Andrew Dunphy ◽  
Brandon Priebe ◽  
Norman H. L. Chiu ◽  
...  
Keyword(s):  
Endothelial Cells ◽  
Interleukin 1 ◽  
Antioxidant Properties ◽  
Synthesis Method ◽  
Microvascular Endothelial Cells ◽  
Carbon Nanodots ◽  
Uptake Mechanism ◽  
Tnf Α ◽  
Anti Inflammatory ◽  
Microvascular Endothelial

Cardiovascular disease (CVD) has become an increasingly important topic in the field of medical research due to the steadily increasing rates of mortality caused by this disease. With recent advancements in nanotechnology, a push for new, novel treatments for CVD utilizing these new materials has begun. Carbon Nanodots (CNDs), are a new form of nanoparticles that have been coveted due to the green synthesis method, biocompatibility, fluorescent capabilities and potential anti-antioxidant properties. With much research pouring into CNDs being used as bioimaging and drug delivery tools, few studies have been completed on their anti-inflammatory potential, especially in the cardiovascular system. CVD begins initially by endothelial cell inflammation. The cause of this inflammation can come from many sources; one being tumor necrosis factor (TNF-α), which can not only trigger inflammation but prolong its existence by causing a storm of pro-inflammatory cytokines. This study investigated the ability of CNDs to attenuate TNF-α induced inflammation in human microvascular endothelial cells (HMEC-1). Results show that CNDs at non-cytotoxic concentrations reduce the expression of pro-inflammatory genes, mainly Interleukin-8 (IL-8), and interleukin 1 beta (IL-1β). The uptake of CNDs by HMEC-1s was examined. Results from the studies involving channel blockers and endocytosis disruptors suggest that uptake takes place by endocytosis. These findings provide insights on the interaction CNDs and endothelial cells undergoing TNF-α induced cellular inflammation.

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