Uploads by Dianagarnica
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| Date | Name | Thumbnail | Size | Description |
|---|---|---|---|---|
| 13:38, 21 January 2022 | Class Week 2.pdf (file) |  |
2.82 MB | |
| 20:59, 18 January 2022 | Class Week 1.pdf (file) | |
1.83 MB | CHEM-606 Trace Analysis 2022S |
| 16:49, 13 January 2022 | Download.png (file) |  |
3 KB | |
| 19:00, 16 December 2021 | SGC new methods.png (file) |  |
179 KB | |
| 18:33, 16 December 2021 | Commercial coffee samples.png (file) |  |
526 KB | |
| 18:14, 16 December 2021 | ACS 002.JPG (file) |  |
33 KB | |
| 17:27, 16 December 2021 | CHEM 671 Coffee Project Rahmah & Diana.pdf (file) | |
3.78 MB | |
| 13:35, 16 November 2021 | Impacts of discarded coffee waste on human and environmental health.pdf (file) | |
645 KB | |
| 13:34, 16 November 2021 | Conceptualization of a spent coffee grounds biorefinery- A review of existing valorisation approaches.pdf (file) | |
2.21 MB | |
| 13:33, 16 November 2021 | Fermentation of spent coffee grounds by Bacillus clausii induces release of potentially bioactive peptides.pdf (file) | |
1.9 MB | |
| 13:32, 16 November 2021 | A state-of-the-art review on spent coffee ground (SCG) pyrolysis for future biorefinery.pdf (file) | |
5.73 MB | |
| 12:06, 10 November 2021 | Preparation CG ACS.jpeg (file) |  |
2.62 MB | |
| 11:15, 27 October 2021 | EIS 001.png (file) |  |
950 KB | |
| 10:58, 27 October 2021 | OPS 0001.jpg (file) |  |
1.31 MB | |
| 10:57, 27 October 2021 | ASS 0001.jpg (file) |  |
1.36 MB | |
| 10:57, 27 October 2021 | AGS 0001.jpg (file) |  |
2.02 MB | |
| 10:57, 27 October 2021 | AES 0001.jpg (file) |  |
1.84 MB | |
| 10:45, 27 October 2021 | AGS SED.JPG (file) |  |
188 KB | |
| 10:37, 27 October 2021 | ACS SED.JPG (file) |  |
150 KB | |
| 09:01, 27 October 2021 | UU-vis Brewing.png (file) |  |
258 KB | |
| 10:14, 22 September 2021 | ACS5L.jpeg (file) |  |
2.81 MB | |
| 10:07, 22 September 2021 | ACS2L.jpeg (file) |  |
2.12 MB | |
| 09:53, 22 September 2021 | ACS2S- Porous brown solid.jpeg (file) |  |
3.81 MB | |
| 18:03, 9 September 2021 | PA214 l.jpeg (file) |  |
39 KB | |
| 18:01, 9 September 2021 | Thermo Scientific Heratherm General Protocol Ovens - Application1.jpeg (file) |  |
36 KB | |
| 06:51, 8 September 2021 | Fig. 4. Proton density image of a green (A) and roasted (B) Arabica coffee bean..png (file) | _and_roasted_(B)_Arabica_coffee_bean..png) |
493 KB | |
| 19:46, 7 September 2021 | GUEST 552b3165-7d9b-46b4-b935-e64f50dd1ea4.jpeg (file) |  |
35 KB | |
| 19:34, 7 September 2021 | Dcc-450bk.jpg (file) |  |
44 KB | Cuisinart DCC-450BK |
| 19:11, 7 September 2021 | Naples Coffee.jpg (file) |  |
128 KB | |
| 17:02, 7 September 2021 | Sumatra Coffee.jpg (file) |  |
401 KB | |
| 16:40, 7 September 2021 | Arabic (Ethiopian) Coffee.jpeg (file) | _Coffee.jpeg) |
282 KB | Arabic (Ethiopian) Coffee |
| 08:19, 7 September 2021 | G r a p h i c a l a b s t r a c t.png (file) |  |
803 KB | https://s3-us-west-2.amazonaws.com/oww-files-public/2/2e/2020_Supercritical_CO2_extraction_of_spent_coffee_grounds._Influence_of_co-solvents_and_characterization_of_the_extracts.pdf |
| 05:54, 7 September 2021 | Figure 1 Coffee fruit structure and botanical classification of coffee plant..png (file) |  |
584 KB | https://s3-us-west-2.amazonaws.com/oww-files-public/7/78/2016_Coffee-_Health_Effects_.pdf |
| 05:33, 7 September 2021 | Fig. 1 Flow diagram of the instant cofee production process with aroma recovery.png (file) |  |
325 KB | # Media:2021_Advanced_instrumental_characterization_of_the_coffee_extracts_produced_by_pilot_scale_instant_coffee_process_.pdf |
| 05:10, 7 September 2021 | Fig. 1. Coffee cherry at maturity of 12 cultivars used in this study. .png (file) |  |
2.94 MB | # Media:2021_Chemical_ingredients_characterization_basing_on_1_H_NMR_and_SHS-GC-MS_in_twelve_cultivars_of_Coffea_arabica_roasted_beans_.pdf |
| 03:56, 7 September 2021 | Fig. 1. Illustration of fractionation of spent coffee ground (SCG) with N,N dimethylcyclohexylamine (CyNMe2).png (file) | _with_N,N_dimethylcyclohexylamine_(CyNMe2).png) |
1.17 MB | # Media:2021_Fractionation_of_spent_coffee_ground_with_tertiary_amine_extraction_.pdf |
| 13:25, 2 September 2021 | 2021 Fractionation of spent coffee ground with tertiary amine extraction .pdf (file) | |
2.4 MB | Spent coffee ground (SCG) was fractionated with a tertiary amine (N,N dimethylcyclohexylamine, CyNMe2) to obtain a carbohydrate fraction rich in dietary fiber, a phenolic fraction made of chlorogenic acids (CGAs), and a lipid fraction mainly consisted of palmitic and linoleic acid. The extraction time (6–24 h) and temperature (25–45 ◦C) were evaluated at a constant solvent-to-sample ratio (12:1, v/w). The carbohydrate fraction obtained with CyNMe2 showed relative high values of total dietary... |
| 13:24, 2 September 2021 | 2021 Catalyzed pyrolysis of coffee and tea wastes .pdf (file) | |
2.24 MB | The pyrolysis of food waste has a double environmental advantage as it contributes to the management and treatment of waste and allows the production of renewable fuels. Spent coffee and tea grounds, were characterized by thermogravimetry to determine their composition and evaluating the pyrolysis kinetics of each lignocellulosic pseudocomponent and pyrolyzed in a fixed bed reactor. Tea grounds had about twice the cellulose and higher pyrolysis activation energy than the coffee grounds sample... |
| 13:23, 2 September 2021 | 2020 Supercritical CO2 extraction of spent coffee grounds. Influence of co-solvents and characterization of the extracts.pdf (file) | |
1.44 MB | Spent coffee grounds (SCGs) were extracted with supercritical CO2 at temperatures of 313 K and 333 K, pressures up to 50.0 MPa and different scCO2 flow rates. The addition of co-solvents isopropanol, ethanol and ethyl lactate decreased the time to achieve the maximum oil yield, to half of that with pure CO2. Analysis of the extracted oils by NMR, showed that caffeine content was (0.56–3.96) % and DUFA and MUFA contents changed within (39.8–42.0) % and (12.9–15.8) %, respectively. The analyses... |
| 13:19, 2 September 2021 | 2020 Magnetic spent coffee ground as an efficient and green catalyst for aerobic oxidation of alcohols and tandem oxidative Groebke–Blackburn–Bienaymé reaction.pdf (file) | |
1.49 MB | In this work, magnetic spent coffee ground as a green, inexpensive, and abundant material was synthesized and characterized by a variety of techniques, including X-ray diffraction pattern, thermal gravimetric analysis, scanning electron microscopy, energy-dispersive spectroscopy, inductively coupled plasma optical emission spectrometry, and Fourier transform infrared spectroscopy. The magnetic spent coffee ground was successfully utilized as a catalyst in aerobic oxidation of primary and seco... |
| 13:16, 2 September 2021 | 2020 Biosynthesis of silver nanoparticles as catalyst by spent coffee ground-recycled poly(ethylene terephthalate) composites.pdf (file) | |
2.66 MB | Spent coffee ground (SCG) and poly(ethylene terephthalate) (PET) bottles are common wastes in the beverage industries. In this study, SCG and PET sheets from waste PET bottles were utilized to prepare PET/SCG composites. Those composites were embedded with sil- ver nanoparticles (AgNPs) prepared from AgNO3 solutions (0–100 mM) without addition of catalyst or reducing agent, to be AgNPs@PET/SCG sheets. The generation of AgNPs was con- firmed by field emission scanning electron microscopy (FESE... |
| 13:12, 2 September 2021 | 2019 NMR analysis of roasted coffee lipids and development of a spent ground coffee application for the production of bioplastic precursors .pdf (file) | |
1.43 MB | Multinuclear and multidimensional NMR spectroscopy was applied as a robust and rapid tool for the analysis of several classes of non-polar compounds in roasted coffee beans, coffee beverage and spent coffee grounds. In addition to various fatty acids, other compounds found in roasted coffee lipids, include oxidation and hydrolysis products, terpenes, sterols, and phospholipids. Spent coffee grounds have a similar fatty acid composition with roasted coffee beans and they are rich in Cafestol a... |
| 13:11, 2 September 2021 | 2019 Extraction of polyphenols and synthesis of new activated carbon from spent cofee grounds.pdf (file) | |
1.37 MB | A valorization process of spent coffee grounds (SCG) was studied. Thus, a two-stage process, the first stage of polyphenols extraction and synthesis of a carbonaceous precursor and a subsequent stage of obtaining activated carbon (AC) by means of a carbonization process from the precursor of the previous stage, was performed. The extraction was carried out with a hydro-alcoholic solution in a pressure reactor, modifying time, temperature and different mixtures EtOH:H2o. to optimize the polyph... |
| 13:04, 2 September 2021 | 2018 Influence of solvent selection and extraction temperature on yield and composition of lipids extracted from spent coffee grounds .pdf (file) | |
584 KB | Spent coffee grounds (SCG) are a potentially sustainable source of C16-C18 triglycerides. This study investigates known solvent extraction technologies with a wide range of solvents for lipid extraction from SCGs, and de- termines the effect of solvent selection and process temperature on the extraction efficiency and composition of the obtained oil. A correlation between increasing solvent boiling point, and therefore process temperature, and improved oil extraction efficiency was observed i... |
| 13:01, 2 September 2021 | 2018 GREEN EXTRACTION OF HIGH ADDED VALUE SUBSTANCES FROM SPENT COFFEE GROUNDS- PRELIMINARY RESULTS.pdf (file) | |
521 KB | A supercritical fluid extraction (SFE) with pure CO2 and ethanol as a co-solvent (10 %) of spent coffee grounds was carried out at temperatures from 313 K to 333 K, pressures up to 40.0 MPa and the results obtained were com- pared with those of the conventional Soxhlet method using n-hexane as a solvent. The best extraction yield (12.0 %) was achieved by SFE with CO2+10 % ethanol, compared to 9.5 - 10.7 % by SFE with pure CO2 and 10.4 % with n-hexane. The antioxidant potential was evaluated b... |
| 12:54, 2 September 2021 | 2015 Structural elucidation of tannins of spent coffee grounds by CP-MAS 13C NMR and MALDI-TOF MS .pdf (file) | |
963 KB | In this study, carbon-13 nuclear magnetic resonance in the solid state using cross-polarization and magic angle spinning (CP-MAS 13C NMR) spectroscopic and matrix-assisted laser desorption ionization- time of flight (MALDI-TOF) mass spectrometric methods were applied to characterize the composition, constituent monomer and oligomeric structure of tannins of spent coffee grounds (SCG). The findings elu- cidated that the monomeric constituents of tannins of SCG primarily composed of catechin, g... |
| 12:24, 2 September 2021 | 2021 Integrated 1H NMR fingerprint with NIR spectroscopy, sensory properties, and quality parameters in a multi-block data analysis using ComDim to evaluate coffee blends Author links open overlay panel.pdf (file) | |
1.37 MB | Coffee quality is determined by several factors and, in the chemometric domain, the multi-block data analysis methods are valuable to study multiple information describing the same samples. In this industrial study, the Common Dimension (ComDim) multi-block method was applied to evaluate metabolite fingerprints, near- infrared spectra, sensory properties, and quality parameters of coffee blends of different cup and roasting pro- files and to search relationships between these multiple data bl... |
| 12:18, 2 September 2021 | 2021 Chemical ingredients characterization basing on 1 H NMR and SHS-GC-MS in twelve cultivars of Coffea arabica roasted beans .pdf (file) | |
3.48 MB | This work aimed to study the composition differences of roasted beans between 12 coffee cultivars (Catimor 7963, HIBRIDO DE TIMOR, Ruiru 11, Castillo, DTARI 296, DTARI 366, DTARI 392, DTARI 585, SL28, SL34, Catuai-Amarelo and Catuai-Vermelho) from Bourbon-Typica group and Introgressed group under subtropical humid monsoon climate. The water-soluble compounds of roasted coffee beans were characterized by proton nuclear magnetic resonance spectroscopy (1H NMR), and the aroma components were ana... |
| 12:13, 2 September 2021 | 2021 Advanced instrumental characterization of the coffee extracts produced by pilot scale instant coffee process .pdf (file) | |
1.04 MB | Coffee, with production exceeding 10.3 million tonnes in 2018, is one of the most widespread commodities consumed world- wide. One of the increasingly popular coffee products is instant coffee, with consumption exceeding 1.6 million tonnes in 2017. In this work, we present how the combination of 1H NMR and GC–MS allows the characterization of samples from the small pilot-scale instant coffee process. Results were compared with measurements for filter coffee made from the same coffee beans to... |
| 12:10, 2 September 2021 | 2020 The main effects of elevated CO2 and soil-water deficiency on 1H NMR-based metabolic fingerprints of Coffea arabica beans by factorial and mixture design.pdf (file) | |
1.7 MB | The metabolic response of Coffea arabica trees in the face of the rising atmospheric concentration of carbon diox- ide (CO2) combined with the reduction in soil-water availability is complex due to the various (bio)chemical feedbacks. Modern analytical tools and the experimental advance of agronomic science tend to advance in the understanding of the metabolic complexity of plants. In this work, Coffea arabica trees were grown in a Free- Air Carbon Dioxide Enrichment dispositive under factori... |
