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1. One-step hydrothermal synthesis of chiral carbon dots with high asymmetric catalytic activity for an enantioselective direct aldol reaction

Author:
Liu, Shuang; He, Yu; Liu, Yu; Wang, Shuaibin; Jian, Yajun; Li, Baoxin; Xu, Chunli
Source:
Chemical communications 2021 v.57 no.30 pp. 3680-3683
ISSN:
1364-548X
Subject:
citric acid,   etc   ; catalytic activity; condensation reactions; enantioselectivity;     Show all 4 Subjects
Abstract:
... Chiral carbon dots are prepared by a simple and one-step hydrothermal reaction at 180 °C for 2 h using citric acid and d-proline as precursors, which show high asymmetric catalytic activity for enantioselective direct aldol condensation. This work provides a hint for the simple preparation of heterogeneous chiral catalysts. ...
DOI:
10.1039/d1cc00755f

2. Citric acid bioproduction and downstream processing: Status, opportunities, and challenges

Author:
Mores, Sabrina; Vandenberghe, Luciana Porto de Souza; Magalhães Júnior, Antonio Irineudo; de Carvalho, Júlio César; de Mello, Ariane Fátima Murawski; Pandey, Ashok; Soccol, Carlos Ricardo
Source:
Bioresource technology 2021 v.320 pp. 124426
ISSN:
0960-8524
Subject:
citric acid,   etc   ; adsorption; environmental impact; feedstocks; fermentation;     Show all 5 Subjects
Abstract:
... Citric acid (CA) has been widely used in different industrial sectors, being produced through fermentation of low-cost feedstock. The development of downstream processes, easier to operate, environmentally friendly, and more economic than precipitation, is certainly a challenge in CA bioproduction. Large volumes of by-products generated in precipitation require treatment before disposal. Adsorptio ...
DOI:
10.1016/j.biortech.2020.124426

3. Optimizing the cycling life and high-rate performance of Li2ZnTi3O8 by forming thin uniform carbon coating derived from citric acid

Author:
Yang, Huan; Zhu, Hui-Ling; Qi, Yong-Xin; Lun, Ning; Bai, Yu-Jun
Source:
Journal of materials science 2020 v.55 no.32 pp. 15538-15550
ISSN:
0022-2461
Subject:
citric acid,   etc   ; carbon; electrochemistry;     Show all 3 Subjects
Abstract:
... The low electronic conductivity and moderate lithium-ion transfer capability of Li₂ZnTi₃O₈ restrict its application to some degree. In this work, in light of the high affinity of TiO₂ surface with carboxylic acids, citric acid was adopted as a carbon source to form uniform carbon coating layer on LZTO particles. When the mixture of LZTO and citric acid with a mass ratio of 1:0.2 was roasted at 700 ...
DOI:
10.1007/s10853-020-04980-1

4. Enhanced pink-red hues in processed powders from unfermented cacao beans

Author:
Montoya, Cristian Camilo; Valencia, Wilmar Giovanni; Sierra, Jelver Alexander; Penagos, Lucas
Source:
Lebensmittel-Wissenschaft + [i.e. und] Technologie 2021 v.138 pp. 110671
ISSN:
0023-6438
Subject:
citric acid,   etc   ; chocolate; color; flavanols; industry; markets; odors; procyanidins;     Show all 8 Subjects
Abstract:
... Cocoa and chocolate are widely consumed by humans, and habitual intake is associated with benefits to cardiovascular health, which has been attributed to its polyphenolic content. Classically, in the processing of cacao beans, a final brown color has been preferred over the natural red-violet hues present in raw beans as a marker of proper processing and the development of the characteristic choco ...
DOI:
10.1016/j.lwt.2020.110671

5. Catalytic combustion of acetonitrile over CuCeOx-HZSM-5 composite catalysts with different mass ratios: The synergism between oxidation and hydrolysis reactions

Author:
Zhang, Yaoyu; Wang, Yuxing; Liu, Yue; Ying, Qingji; Wu, Zhongbiao
Source:
Journal of colloid and interface science 2021 v.584 pp. 193-203
ISSN:
0021-9797
Subject:
citric acid,   etc   ; acetonitrile; combustion; hydrolysis; mineralization; synergism; temperature; zeolites;     Show all 8 Subjects
Abstract:
... A sequence of CuCeOₓ-HZSM-5 composite catalysts at different Cu-Ce loading synthesized by the citric acid complex impregnation method were evaluated for the catalytic oxidation of acetonitrile. Among which, the 2CuCeOₓ-HZSM-5 sample exhibited the best degradation efficiency. In the temperature range of 225–350 °C, its activity and mineralization rate were approximately 100%, and the N₂ selectivity ...
DOI:
10.1016/j.jcis.2020.09.091

6. Self-ordered anodic porous alumina with inter-hole spacing over 1.5 μm

Author:
Yanagishita, Takashi; Moriyasu, Ryosuke; Ishii, Takayuki; Masuda, Hideki
Source:
RSC advances 2021 v.11 no.6 pp. 3777-3782
ISSN:
2046-2069
Subject:
citric acid,   etc   ; aluminum oxide; electrolytes; ethylene; phosphoric acid;     Show all 5 Subjects
Abstract:
... Self-ordered anodic porous alumina with a long-range ordered hole arrangement having an inter-hole spacing of over 1.5 μm was prepared by anodization in a citric acid electrolyte containing a small amount of phosphoric acid. The inter-hole spacing of the ordered anodic porous alumina could be controlled within a range of 700 nm to 1.8 μm by adjusting the anodization conditions. The use of an elect ...
DOI:
10.1039/d0ra10269e

7. Phosphorus recovery from soil through phosphorus extraction and retention on material: A comparison between batch extraction-retention and column percolation

Author:
Mizuki, Kensuke; Katoh, Masahiko
Source:
Journal of environmental management 2021 v.277 pp. 111435
ISSN:
0301-4797
Subject:
citric acid,   etc   ; calcium; magnesium; mineral fertilizers; phosphorus; soil; wastewater;     Show all 7 Subjects
Abstract:
... Phosphorus (P) recovery from wastewater and soil is important for preventing the depletion of P resources; however, a method for recovering P from soil has not yet been developed. We designed and tested systems to recover P from excavated and in situ soil. P extraction from soil using citric acid, EDTA, and water is combined with P retention by calcium (Ca)- and magnesium (Mg)-containing material ...
DOI:
10.1016/j.jenvman.2020.111435

8. The impacts of altitude and seed pretreatments on seedling emergence of Syrian juniper (Juniperus drupacea (Labill.) Ant. et Kotschy)

Author:
Yucedag, Cengiz; Cetin, Mehmet; Ozel, Halil Baris; Abo Aisha, Adel Easa Saad; Alrabiti, Osama B. Muragaa; AL.JAMA, Akram Mohamed Omar
Source:
Ecological processes 2021 v.10 no.1 pp. 7
ISSN:
2192-1709
Subject:
citric acid,   etc   ; Juniperus; altitude; cold; extinction; forest management; glass; governance; seed germination; seedling emergence; seedling production;     Show all 11 Subjects
Abstract:
... BACKGROUND: Syrian juniper is an economically important species and in danger of extinction. For these reasons, the best seedling production methods of the species should be determined and its plantations should be established. The aim of the study is to examine the impacts of altitude and different pretreatment combinations of cold and warm stratifications, citric acid, shaking seeds in bottles w ...
DOI:
10.1186/s13717-020-00276-z

9. Photoluminescence with an unusual open-loop and rigid delocalized conjugated structure in quantum dots

Author:
Xing, Hanli; Li, Xiaofang; Zhang, Susu; Li, Jun; Tang, Baokun
Source:
Journal of colloid and interface science 2021 v.601 pp. 385-396
ISSN:
0021-9797
Subject:
citric acid,   etc   ; absorption; biocompatibility; bioimaging; computational methodology; heterocyclic compounds; photoluminescence; probability; quantum dots; urea;     Show all 10 Subjects
Abstract:
... It is well known that almost all photoluminescent molecules are aromatic or heterocyclic ring compounds for bioimaging analysis. A question remains as to whether a breakthrough can be achieved regarding a novel photoluminescent molecule without a ring structure, and in a what manner. In this study, we explored the photoelectric conversion and structure of photoluminescent compounds, and constructe ...
DOI:
10.1016/j.jcis.2021.05.112

10. Development of bio-based cornstarch - Mimosa tannin - sugar adhesive for interior particleboard production

Author:
Oktay, Salise; Kızılcan, Nilgün; Bengü, Başak
Source:
Industrial crops and products 2021 v.170 pp. 113689
ISSN:
0926-6690
Subject:
citric acid,   etc   ; Mimosa; corn starch; formaldehyde; particleboards; raw materials; sugars; viscosity; wood;     Show all 9 Subjects
Abstract:
... There are significant challenges related to practical applications of formaldehyde-based wood adhesives due to their formaldehyde content and fossil-based raw materials. Herein, a bio-based wood adhesive formulation that contains cornstarch (CS), Mimosa tannin (MT), sugar (S), and citric acid (CA) was developed. The solid content, curing time, and viscosity of the synthesized adhesive was determin ...
DOI:
10.1016/j.indcrop.2021.113689

11. Effects of processing parameters on furan formation in canned strawberry jam

Author:
Shen, Mingyue; Liu, Lichun; Zhang, Fan; Jiang, Yujie; Huang, Zhengbo; Xie, Jianhua; Zhong, Yadong; Nie, Shaoping; Xie, Mingyong
Source:
Food chemistry 2021 v.358 pp. 129819
ISSN:
0308-8146
Subject:
citric acid,   etc   ; carbon; dehydroascorbic acid; food chemistry; fructose; furans; glucose; pH; pectins; strawberries; sucrose; xanthan gum;     Show all 12 Subjects
Abstract:
... The formation mechanism of furan has been studied extensively in model systems, however, furan formation in real foods are complex and far from being fully understood. In this study, the effects of acid-regulating agent (citric acid), sugar addition (glucose, fructose and sucrose) and thickening agents (xanthan gum, κ-carrageenan and pectin) on furan levels in strawberry jams were studied; meanwhi ...
DOI:
10.1016/j.foodchem.2021.129819

12. Inhibitory effects and mechanisms of low-molecular-mass organic acids (LMMOAs) toward Cr(III) oxidation

Author:
Ng, Kim Hoong; Liu, Yu-Ting; Chang, Chung Tse; Chiang, Po-Neng; Teah, Heng Yi; Chang, Po Hsiang; Tzou, Yu-Min
Source:
Journal of cleaner production 2021 v.313 pp. 127726
ISSN:
0959-6526
Subject:
citric acid,   etc   ; acetic acid; oxalic acid; oxidation; pH; photolysis; photoreduction; pollution;     Show all 8 Subjects
Abstract:
... Photo-reduction of Cr(VI) into Cr(III) has been extensively studied for the alleviation of Cr(VI) hazards. However, knowledge in regard to the Cr(III) oxidation back into Cr(VI), which serves an equally important role in controlling Cr pollution, is limited. To this end, inhibitory effects and related mechanisms of low-molecular-mass organic acids (LMMOAs), including citric acid, oxalic acid and a ...
DOI:
10.1016/j.jclepro.2021.127726

13. Effective removal of heavy metals from water using porous lignin-based adsorbents

Author:
Wang, Xiaohong; Li, Xin; Peng, Lili; Han, Shiqi; Hao, Chen; Jiang, Chenglong; Wang, Huili; Fan, Xiangbo
Source:
Chemosphere 2021 v.279 pp. 130504
ISSN:
0045-6535
Subject:
citric acid,   etc   ; acrylic acid; adsorbents; adsorption; electrostatic interactions; kinetics; lignosulfonates; pollution control; polymerization; sodium; sorption isotherms;     Show all 11 Subjects
Abstract:
... Multifunctional composite materials are the key to improving removal capacity and environmental utility. Here, the adsorbent (SLCA) was obtained by free-radical polymerization of acrylic acid with sodium lignosulfonate and citric acid. FTIR, SEM, TGA and XPS characterization methods were used to prove the structure and properties of SLCA adsorbents. The maximum uptake capacities of the optimized S ...
DOI:
10.1016/j.chemosphere.2021.130504

14. Optimal cleaning strategy to alleviate fouling in membrane distillation process to treat anaerobic digestate

Author:
Charfi, Amine; Kim, Sewoon; Yoon, Yeomin; Cho, Jinwoo
Source:
Chemosphere 2021 v.279 pp. 130524
ISSN:
0045-6535
Subject:
citric acid,   etc   ; anaerobic digestion; distillation; inorganic matter; sludge; sodium hypochlorite; wastewater;     Show all 7 Subjects
Abstract:
... This paper deals with the membrane fouling issue in the Direct Contact Membrane Distillation (DCMD) process treating a wasted sludge from an anaerobic digestion process. The main objective is to define an optimal cleaning strategy to alleviate fouling. Using a lab scale DCMD process, a cleaning strategy based on DI water flushing followed by 0.2% sodium hypochlorite (NaOCl) and 3% citric acid (C₆H ...
DOI:
10.1016/j.chemosphere.2021.130524

15. Increasing the bromazepam solubility by forming eutectic mixture with citric acid

Author:
Macasoi, Cristina; Pincu, Elena; Jurca, Bogdan; Meltzer, Viorica
Source:
Thermochimica acta 2021 v.702 pp. 178954
ISSN:
0040-6031
Subject:
citric acid,   etc   ; Fourier transform infrared spectroscopy; mole fraction; physical phases; solubility;     Show all 5 Subjects
Abstract:
... Bromazepam, citric acid and their binary mixtures were analysed by Differential Scanning Calorimetry. For the bromazepam molar fraction 0.7, the mixture presents a eutectic which suggests an increase in solubility at this composition. The mixture’s greater solubility has been confirmed by a series of dissolution tests. Fourier Transform Infrared spectroscopy and X-ray diffraction tests have been p ...
DOI:
10.1016/j.tca.2021.178954

16. Stabilization of hexavalent chromium with pretreatment and high temperature sintering in highly contaminated soil

Author:
Mou, Haiyan; Liu, Wenchao; Zhao, Lili; Chen, Wenqing; Ao, Tianqi
Source:
Frontiers of environmental science & engineering 2021 v.15 no.4 pp. 61
ISSN:
2095-2201
Subject:
citric acid,   etc   ; chromium; ferric sulfate; landfills; mineralization; polluted soils; sodium sulfide; solid wastes; temperature;     Show all 9 Subjects
Abstract:
... This study explored the effectiveness and mechanisms of high temperature sintering following prereduction with ferric sulfate (FeSO₄), sodium sulfide (Na₂S), or citric acid (C₆H₈O₇) in stabilizing hexavalent chromium (Cr(VI)) in highly contaminated soil. The soil samples had an initial total Cr leaching of 1768.83 mg/L, and Cr(VI) leaching of 1745.13 mg/L. When FeSO₄ or C₆H₈O₇ reduction was follow ...
DOI:
10.1007/s11783-020-1353-7

17. Effect of root exudates on the stability and transport of graphene oxide in saturated porous media

Author:
Li, Xiaohui; Gao, Bin; Xu, Hongxia; Sun, Yuanyuan; Shi, Xiaoqing; Wu, Jichun
Source:
Journal of hazardous materials 2021 v.413 pp. 125362
ISSN:
0304-3894
Subject:
citric acid,   etc   ; chemical structure; equations; graphene oxide; ionic strength; molecular weight; oxalic acid; pH; sand;     Show all 9 Subjects
Abstract:
... Root exudates are a major source of dissolved organic matters that strongly affect the stability and transport behaviors of nanomaterials in porous media. This study investigated the effect of citric acid (CA) and oxalic acid (OA), two common low molecular weight root exudates, on the stability and transport of graphene oxide (GO) in saturated sand columns under different combinations of pH (4.5, ...
DOI:
10.1016/j.jhazmat.2021.125362

18. Evaluation of bioactive release kinetics from crosslinked chitosan films with Aloe vera

Author:
Zarandona, Iratxe; Minh, Nguyen Cong; Trung, Trang Si; de la Caba, Koro; Guerrero, Pedro
Source:
International journal of biological macromolecules 2021 v.182 pp. 1331-1338
ISSN:
0141-8130
Subject:
citric acid,   etc   ; Aloe vera; Maillard reaction; bioactive compounds; cell adhesion; chitosan; crosslinking; hydrophilicity; temperature;     Show all 9 Subjects
Abstract:
... Thermocompression was employed to prepare citric acid-crosslinked chitosan films with Aloe vera (AV) as bioactive compound. Films were easy to handle and mechanical properties did not change with the addition of AV up to 10 wt%, although both TS and EAB decreased for the films with 15 wt% AV, indicating that high AV contents would hinder intermolecular interactions among the formulation components ...
DOI:
10.1016/j.ijbiomac.2021.05.087

19. Decontamination of aflatoxin B1 in peanuts using various cooking methods

Author:
Dhanshetty, Manisha; Elliott, Christopher T.; Banerjee, Kaushik
Source:
Journal of food science and technology 2021 v.58 no.7 pp. 2547-2554
ISSN:
0022-1155
Subject:
citric acid,   etc   ; aflatoxin B1; decontamination; equipment; fluorescence; food safety; liquids; peanuts; pressure cooking; public health;     Show all 10 Subjects
Abstract:
... Peanut and its processed products are recurrently contaminated with aflatoxins (AFs) which are of potential public health concern. Among the different types of AFs, Aflatoxin B1 (B1) is the most frequently detected in peanuts over the maximum level (ML), and thus has warranted considerable research interest in the domain of food safety. In this study, we investigated the decontamination of B1 in t ...
DOI:
10.1007/s13197-020-04761-3

20. Influence of food additives on blister formation in tinplate can of coconut milk

Author:
Promlok, Duangkamol; Kanjanaprayut, Noparat; Kiatisereekul, Nuntawat; Chanthateyanonth, Ratana; Jariyaboon, Manthana
Source:
Journal of food engineering 2021 v.300 pp. 110513
ISSN:
0260-8774
Subject:
citric acid,   etc   ; carboxymethylcellulose; coconut milk; dielectric spectroscopy; guar gum; microscopy; oxygen; polysorbates; sodium metabisulfite;     Show all 9 Subjects
Abstract:
... Blistering is one of the major issues in processed canned coconut milk that contain several food additives. The goal of this work is to investigate the effect of five different food additives, guar gum, sodium carboxymethyl cellulose (CMC), polysorbate 60 (tween 60), citric acid (C₆H₈O₇), and sodium metabisulfite (Na₂S₂O₅), on blister formation in epoxy-phenolic coated tinplate cans using electroc ...
DOI:
10.1016/j.jfoodeng.2021.110513