Isolation and characterization of cellulose nanocrystals from jackfruit peel

Abstract In the present work, sustainable nanomaterials, cellulose, and spherical cellulose nanocrystals (SCNCs) were isolated from the non-edible parts of jackfruit (Artocarpus heterophyllus). Of the three different methods tested, sodium chlorite treatment produced the highest yield of cellulose, 20.08 ± 0.05% w/w (dry weight). Peaks observed in CP/MAS 13C NMR spectrum and FTIR frequencies revealed the presence of α-cellulose and absence of other biomass fractions like hemicellulose and lignin. XRD analysis showed a high crystallinity of 83.42%. An appearance of a sharp endothermal peak at 323 °C in DSC and decomposition patterns between 310–420 °C of TGA confirms the presence of cellulose. Further, Sulphuric acid hydrolysis was employed to produce SCNCs and examined by TEM for the morphology and by HPLC for the presence of glucose.

Download Full-text

Isolation and Characterization of Cellulose Nanocrystals from Different Lignocellulosic Residues: A Comparative Study

Journal of Polymers and the Environment ◽

10.1007/s10924-021-02089-3 ◽

2021 ◽

Author(s):

Tesfaye Gabriel ◽

Anteneh Belete ◽

Gerd Hause ◽

Reinhard H. H. Neubert ◽

Tsige Gebre-Mariam

Keyword(s):

Comparative Study ◽

Cellulose Nanocrystals ◽

Lignocellulosic Residues ◽

Isolation And Characterization

Download Full-text

ISOLATION AND PHYSICOCHEMICAL CHARACTERIZATION OF STARCH FROM TARO BOLOSO-I TUBERS

INDIAN DRUGS ◽

10.53879/id.55.07.11391 ◽

2018 ◽

Vol 55 (07) ◽

pp. 20-27

Author(s):

Tamrat Balcha ◽

◽

Nisha Mary Joseph ◽

Anteneh Belete

Keyword(s):

Agricultural Research ◽

Potato Starch ◽

Physicochemical Characterization ◽

Dry Weight ◽

Weight Basis ◽

Rice Starch ◽

Small Particles ◽

New Variety ◽

Isolation And Characterization

Taro Boloso-I is a new variety of Colocasia esculenta (L. Schott) officially released from Areka Agricultural Research Center, Areka, Ethiopia. Its cultivation out yields a previously reported variety (Godare) by 67%. The study focuses on isolation and characterization of starch from this plant. Isolation of starch was done using saline and sodium hydroxide and characterized for its physicochemical constituents. Its yield on dry weight basis was 83.5 ± 1.6%. The native Taro Boloso-I starch (NTBIS) showed lower amylose to amylopectin ratio (20.7 ± 1.8% to 77.3 ± 2.1%, w/w) and significantly higher onset (68.40˚C), peak (75.46 ˚C) and endset (84.40 ˚C) temperatures of gelatinization than potato starch which has gelatinization range of 62.50–67.53–79.40 ˚C. The shapes of the granules were polyhedral/angular with an A-type polymorphism with a poor flow.The starch is comprised of small particles (mean diameter of 2.45 ± 0.11 μm).Taro Boloso-I starch possesses similarity with cereal starches like the rice starch though it is a tuber starch and moreover, on comparison with the previously reported varieties of Taro, there is difference in its properties.

Download Full-text

Efficient resolution of racemic crown-shaped cyclotriveratrylene derivatives and isolation and characterization of the intermediate saddle isomer

Beilstein Journal of Organic Chemistry ◽

10.3762/bjoc.15.133 ◽

2019 ◽

Vol 15 ◽

pp. 1339-1346

Author(s):

Sven Götz ◽

Andreas Schneider ◽

Arne Lützen

Keyword(s):

High Performance Liquid Chromatography ◽

Liquid Chromatography ◽

Nmr Spectroscopy ◽

High Performance ◽

Chiral Stationary Phase ◽

Hplc Separation ◽

Promising Alternative ◽

Isolation And Characterization ◽

C Nmr

The preparative resolution of a trifunctionalized C 3-symmetrical chiral cyclotriveratrylene derivative was achieved via high-performance liquid chromatography (HPLC) on a chiral stationary phase. This approach is a promising alternative to the previously reported resolution through formation of diastereomeric esters because it involves fewer synthetic steps and is less prone to thermal (re)racemization. During these studies an intermediate saddle conformer could also be isolated and characterized by 1H and 13C NMR spectroscopy. The HPLC separation method was further developed in order to allow investigations on the racemization behavior of the cyclotriveratrylene derivative.

Download Full-text

Isolation and Characterization of Cellulose Nanocrystals Created from Recycled Laser Printed Paper

BioResources ◽

10.15376/biores.13.4.7404-7429 ◽

2018 ◽

Vol 13 (4) ◽

Cited By ~ 1

Author(s):

Rogelio Ramírez Casillas ◽

Karen Fátima Báez Rodríguez ◽

Ricardo Herbe Cruz-Estrada ◽

Florentina Dávalos-Olivares ◽

Fernando Navarro-Arzate ◽

...

Keyword(s):

Cellulose Nanocrystals ◽

Isolation And Characterization

Download Full-text

Synthesis and characterization of silver(I) complexes of thioureas and thiocyanate: crystal structure of polymeric (1,3-diazinane-2-thione)thiocyanato silver(I)

Zeitschrift für Naturforschung B ◽

10.1515/znb-2014-0263 ◽

2015 ◽

Vol 70 (8) ◽

pp. 541-546 ◽

Cited By ~ 5

Author(s):

Muhammad Nawaz Tahir ◽

Anvarhusein A. Isab ◽

Fozia Afzal ◽

Kashif Raza ◽

Shah Muhammad ◽

...

Keyword(s):

Crystal Structure ◽

Nmr Spectrum ◽

Coordination Environment ◽

X Ray Crystallography ◽

H Nmr ◽

Ir And Nmr Spectroscopy ◽

A Chain ◽

Distorted Tetrahedral Coordination ◽

C Nmr

AbstractSilver(I) complexes of thioureas and thiocyanate, [(Tu)AgSCN], [(Metu)AgSCN], [(Dmtu)AgSCN], [(Tmtu)(AgSCN)1.5], [(Imt)AgSCN], and [(Diaz)AgSCN] (where Tu = thiourea, Metu = N-methylthiourea, Dmtu = N,N′-dimethylthiourea, Tmtu = N,N,N′,N′-tetramethylthiourea, Imt = 1,3-imidazolidine-2-thione, and Diaz = 1,3-diazinane-2-thione), have been prepared and characterized by elemental analysis, IR and NMR spectroscopy, and thermal analysis. The crystal structure of one of them, [(Diaz)Ag(SCN)] (1), was determined by X-ray crystallography. The crystal structure of 1 shows that the complex exists in the form of a chain-like polymer comprising [Ag(μ2-Diaz)(μ2-SCN)] units. The silver atoms are bridged by μ2-thione sulfur atoms of Diaz and μ2-thiocyanate sulfur atoms. Thereby each silver atom adopts a distorted tetrahedral coordination environment comprising four sulfur atoms, two from thione and two from thiocyanate ligands. An upfield shift in the >C=S resonance of thiones in 13C NMR and a downfield shift in the N–H resonance in 1H NMR are consistent with the sulfur coordination to silver(I). The appearance of a band around 2100 cm–1 in the IR and a resonance around 125 ppm in the 13C NMR spectrum indicates the binding of thiocyanate to silver(I).

Download Full-text

Characterization of cellulose and TEMPO-oxidized celluloses prepared from Eucalyptus globulus

Holzforschung ◽

10.1515/hf-2021-0159 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Yuko Ono ◽

Miyuki Takeuchi ◽

Yaxin Zhou ◽

Akira Isogai

Keyword(s):

Eucalyptus Globulus ◽

Dry Weight ◽

Cellulose Microfibrils ◽

Crystalline Cellulose ◽

Crystalline Region ◽

Cellulose I ◽

Nmr Spectrum ◽

Significant Damage ◽

Mediated Oxidation

Abstract Eucalyptus (Eucalyptus globulus) cellulose was isolated from wood powder by dewaxing, delignification, and subsequent 4% NaOH extraction. 2,2,6,6-Tetramethyl-piperidine-1-oxyl (TEMPO)-oxidized eucalyptus celluloses were prepared from never-dried eucalyptus cellulose (EC) in yields of 96% and 72% (based on the dry weight of EC) when oxidized with NaOCl of 5 and 10 mmol/g-EC, respectively. Their carboxy contents were 1.4 and 1.8 mmol/g, respectively, when determined by conductivity titration. The crystallinity of cellulose I for EC decreased by TEMPO-mediated oxidation, showing that the originally crystalline region in EC was partly converted to disordered regions by TEMPO-mediated oxidation. Correspondingly, the relative signal area of C6‒OH/C1 with the trans-gauche (tg) conformation attributed to crystalline cellulose I in the solid-state 13C NMR spectrum of EC decreased from 0.42 to 0.34 by TEMPO-mediated oxidation with NaOCl of 10 mmol/g-EC. TEMPO-oxidized EC prepared with NaOCl of 10 mmol/g-EC was almost completely converted into individual TEMPO-oxidized EC nanofibrils (TEMPO-ECNFs) of homogeneous widths of ∼3 nm widths and lengths of >1 μm by mechanical disintegration in water. However, the TEMPO-ECNFs contained many kinks and had uneven surfaces, probably owing to significant damage occurring on the surface cellulose molecules of crystalline cellulose microfibrils during TEMPO-mediated oxidation.

Download Full-text