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Rourke-Funderburg AS, Walter AB, Carroll B, Mahadevan-Jansen A, Locke AK. Development of a Low-Cost Paper-Based Platform for Coffee Ring-Assisted SERS. ACS OMEGA 2023; 8:33745-33754. [PMID: 37744797 PMCID: PMC10515595 DOI: 10.1021/acsomega.3c03690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 07/14/2023] [Indexed: 09/26/2023]
Abstract
The need for highly sensitive, low-cost, and timely diagnostic technologies at the point of care is increasing. Surface-enhanced Raman spectroscopy (SERS) is a vibrational spectroscopic technique that is an advantageous technique to address this need, as it can rapidly detect analytes in small or dilute samples with improved sensitivity compared to conventional Raman spectroscopy. Despite the many advantages of SERS, one drawback of the technique is poor reproducibility due to variable interactions between nanoparticles and target analytes. To overcome this limitation, coupling SERS with the coffee ring effect has been implemented to concentrate and localize analyte-nanoparticle conjugates for improved signal reproducibility. However, current coffee ring platforms require laborious fabrication steps. Herein, we present a low-cost, two-step fabrication process for coffee ring-assisted SERS, utilizing wax-printed nitrocellulose paper. The platform was designed to produce a highly hydrophobic paper substrate that supports the coffee ring effect and tested using gold nanoparticles for SERS sensing. The nanoparticle concentration and solvent were varied to determine the effect of solution composition on ring formation and center clearance. The SERS signal was validated using 4-mercaptobenzoic acid (MBA) and tested with Moraxella catarrhalis bacteria to ensure functionality for chemical and biological applications. The limit of detection using MBA is 41.56 nM, and the biochemical components of the bacterial cell wall were enhanced with low spectral variability. The developed platform is advantageous due to ease of fabrication and use, representing the next step toward implementing low-cost coffee ring-assisted SERS for point-of-care sensing.
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Affiliation(s)
- Anna S. Rourke-Funderburg
- Department
of Biomedical Engineering, Vanderbilt University, Nashville, Tennessee 37240-0002, United
States
- Vanderbilt
Biophotonics Center, Vanderbilt University, Nashville, Tennessee 37240-0002, United
States
| | - Alec B. Walter
- Department
of Biomedical Engineering, Vanderbilt University, Nashville, Tennessee 37240-0002, United
States
- Vanderbilt
Biophotonics Center, Vanderbilt University, Nashville, Tennessee 37240-0002, United
States
| | - Braden Carroll
- Vanderbilt
Biophotonics Center, Vanderbilt University, Nashville, Tennessee 37240-0002, United
States
| | - Anita Mahadevan-Jansen
- Department
of Biomedical Engineering, Vanderbilt University, Nashville, Tennessee 37240-0002, United
States
- Vanderbilt
Biophotonics Center, Vanderbilt University, Nashville, Tennessee 37240-0002, United
States
| | - Andrea K. Locke
- Department
of Biomedical Engineering, Vanderbilt University, Nashville, Tennessee 37240-0002, United
States
- Vanderbilt
Biophotonics Center, Vanderbilt University, Nashville, Tennessee 37240-0002, United
States
- Department
of Chemistry, Vanderbilt University, Nashville, Tennessee 37240-0002, United
States
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Dyrda-Terniuk T, Pryshchepa O, Rafińska K, Kolankowski M, Gołębiowski A, Gloc M, Dobrucka R, Kurzydłowski K, Pomastowski P. Immobilization Of Silver Ions Onto Casein. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2023.131390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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Laccase and glucono-δ-lactone dual-induced gelation of casein and arabinoxylan: Microstructures, physicochemical properties, and pH-responsive release behavior. Food Hydrocoll 2023. [DOI: 10.1016/j.foodhyd.2022.108235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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4
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A hybrid optical strategy based on graphene quantum dots and gold nanoparticles for selective determination of gentamicin in the milk and egg samples. Food Chem 2022; 370:131312. [PMID: 34788957 DOI: 10.1016/j.foodchem.2021.131312] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 09/28/2021] [Accepted: 10/02/2021] [Indexed: 11/21/2022]
Abstract
A rapid and sensitive hybrid nanosensor was reported with a colorimetric and fluorometric readout system using graphene quantum dots (GQDs) and gold nanoparticles (AuNPs) for the detection of gentamicin (GENTA) in milk and egg samples. In the presence of AuNPs, the fluorescence (FL) intensity of GQDs gradually decreased due to the inner filter effect (IFE) of AuNPs on the FL intensity of GQDs. In addition of GENTA into AuNPs, AuNPs get aggregated and changed their color from red to blue, due to which the IFE of AuNPs reduced and hence, enhanced FL intensity of GQDs with varying concentration of GENTA from 1.03 to 16.55 μM with a lower detection limit of 0.422 μM and 0.493 μM in colorimetric and fluorimetric systems, respectively. The practical application of the developed nanosensor is tested against the real spiked sample. The excellent and straightforward recovery efficiency of the developed nanosensor for the determination of GENTA and can be used as a promising and adaptable tool for speedy monitoring of food quantity.
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Gandhi S, Roy I. Drug delivery applications of casein nanostructures: A minireview. J Drug Deliv Sci Technol 2021. [DOI: 10.1016/j.jddst.2021.102843] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Adel RM, Lotfy RA, Darwish AS, Amer AS. Destructive effect of iron overload in brain tissue of albino rats: Ameliorative role of silver immobilized organo-modified casein nanocomposite as co-treating agent with Deferasirox. J Trace Elem Med Biol 2021; 67:126794. [PMID: 34052583 DOI: 10.1016/j.jtemb.2021.126794] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 05/03/2021] [Accepted: 05/17/2021] [Indexed: 01/19/2023]
Abstract
BACKGROUND Iron (Fe) is one of the most essential trace elements in the body that play crucial role in organisms' survival, however, excess deposition of it puts patients at higher risk of iron overload and tissue injury through production of reactive oxygen species (ROS), elevation of oxidative stress, development of endocrine disorders among which hypogonadism, and increased incidence of cells damage in vital organs. As deferasirox (DFX) is an approved Fe chelator drug, its inability to cross blood brain barrier (BBB) remains a definite obstacle against its use as Fe chelator in the brain. Lately, attention to nanoparticles usage in researches has been widely grown since their role in improving drug therapeutic effects and scavenging free radicals make them good candidates as chelating and antioxidant agents. AIMS Herein, after induction of iron overload, organo-modified casein immobilized silver nanocomposite (Ag@Tr-CA) was designed and explored as combined therapy with DFX drug to develop its penetrating efficiency toward BBB and its Fe chelating affinity. Moreover, to distinguish the advanced antioxidant character as well as the beneficial impact of it on lowering brain's oxidative stress. Meanwhile, its capability in regulating serum pituitary hormones such as follicle stimulating hormone (FSH), luteinizing hormone (LH), prolactin (PRL), and testosterone (T), ameliorating DNA damage, and improving brain's histopathological alterations was also assessed. METHODS The physicochemical characteristics of Ag@Tr-CA was carried out using X-ray powder diffractometry (XRD), Fourier transform infrared (FTIR), dynamic light scattering (DLS), field emission scanning electron microscope (FE-SEM), and high-resolution transmission electron microscope (HR-TEM) analyses. Effect of iron overload and subsequent treatment with DFX + Ag@Tr-CA on brain of adult male albino rats were evaluated using colorimetric methods to determine brain Fe concentration and brain oxidative stress biomarkers. Assessment of serum Fe indices and serum pituitary hormones (FSH, LH, PRL) and T were estimated by ELISA technique. Determination of DNA damage in cerebral cortex cells was accomplished using the alkaline version of comet assay, while detection of brain's histopathological alterations was performed by examination of H&E sections under light microscope. RESULTS The physicochemical characteristics of Ag@Tr-CA showing the proficiency of Ag nanoparticles (∼35 nm) in creating highly-ordered negatively charged micro-sized casein particles (∼450 μm). After induction of iron overload, DFX + Ag@Tr-CA combination efficiently down brain Fe concentration, brain oxidative stress markers, and DNA damage in cerebral cortex cells linked with improvements in brain histopathological alterations. Comparing DFX therapeutic action alone to its combination to whether Ag@Tr-CA or Tr-CA (organo-modified cross-linked casein nanoparticles) as co-treating agents revealed no significant effect on serum Fe indices, FSH, LH, PRL, and T against iron overload disease. CONCLUSION The present results showed that combination of Ag@Tr-CA nanocomposite with DFX makes it a promising co-treating agent against iron overload through improving the physiological, molecular, and histological structure of the brain in iron overloaded rats.
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Affiliation(s)
- Rana M Adel
- Zoology Department, Faculty of Women for Arts, Science and Education, Ain Shams University, 11757, Cairo, Egypt.
| | - Rania A Lotfy
- Zoology Department, Faculty of Women for Arts, Science and Education, Ain Shams University, 11757, Cairo, Egypt.
| | - Atef S Darwish
- Chemistry Department, Faculty of Science, Ain Shams University, 11566, Cairo, Egypt.
| | - Amany S Amer
- Zoology Department, Faculty of Women for Arts, Science and Education, Ain Shams University, 11757, Cairo, Egypt.
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Nanoencapsulation of Essential Oils as Natural Food Antimicrobial Agents: An Overview. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11135778] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The global demand for safe and healthy food with minimal synthetic preservatives is continuously increasing. Natural food antimicrobials and especially essential oils (EOs) possess strong antimicrobial activities that could play a remarkable role as a novel source of food preservatives. Despite the excellent efficacy of EOs, they have not been widely used in the food industry due to some major intrinsic barriers, such as low water solubility, bioavailability, volatility, and stability in food systems. Recent advances in nanotechnology have the potential to address these existing barriers in order to use EOs as preservatives in food systems at low doses. Thus, in this review, we explored the latest advances of using natural actives as antimicrobial agents and the different strategies for nanoencapsulation used for this purpose. The state of the art concerning the antibacterial properties of EOs will be summarized, and the main latest applications of nanoencapsulated antimicrobial agents in food systems will be presented. This review should help researchers to better choose the most suitable encapsulation techniques and materials.
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Piovarci I, Melikishvili S, Tatarko M, Hianik T, Thompson M. Detection of Sub-Nanomolar Concentration of Trypsin by Thickness-Shear Mode Acoustic Biosensor and Spectrophotometry. BIOSENSORS 2021; 11:117. [PMID: 33920444 PMCID: PMC8070231 DOI: 10.3390/bios11040117] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 03/26/2021] [Accepted: 04/06/2021] [Indexed: 05/03/2023]
Abstract
The determination of protease activity is very important for disease diagnosis, drug development, and quality and safety assurance for dairy products. Therefore, the development of low-cost and sensitive methods for assessing protease activity is crucial. We report two approaches for monitoring protease activity: in a volume and at surface, via colorimetric and acoustic wave-based biosensors operated in the thickness-shear mode (TSM), respectively. The TSM sensor was based on a β-casein substrate immobilized on a piezoelectric quartz crystal transducer. After an enzymatic reaction with trypsin, it cleaved the surface-bound β-casein, which increased the resonant frequency of the crystal. The limit of detection (LOD) was 0.48 ± 0.08 nM. A label-free colorimetric assay for trypsin detection has also been performed using β-casein and 6-mercaptohexanol (MCH) functionalized gold nanoparticles (AuNPs/MCH-β-casein). Due to the trypsin cleavage of β-casein, the gold nanoparticles lost shelter, and MCH increased the attractive force between the modified AuNPs. Consequently, AuNPs aggregated, and the red shift of the absorption spectra was observed. Spectrophotometric assay enabled an LOD of 0.42 ± 0.03 nM. The Michaelis-Menten constant, KM, for reverse enzyme reaction has also been estimated by both methods. This value for the colorimetric assay (0.56 ± 0.10 nM) is lower in comparison with those for the TSM sensor (0.92 ± 0.44 nM). This is likely due to the better access of the trypsin to the β-casein substrate at the surface of AuNPs in comparison with those at the TSM transducer.
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Affiliation(s)
- Ivan Piovarci
- Department of Nuclear Physics and Biophysics, Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynska dolina F1, 84248 Bratislava, Slovakia; (I.P.); (S.M.); (M.T.)
| | - Sopio Melikishvili
- Department of Nuclear Physics and Biophysics, Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynska dolina F1, 84248 Bratislava, Slovakia; (I.P.); (S.M.); (M.T.)
| | - Marek Tatarko
- Department of Nuclear Physics and Biophysics, Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynska dolina F1, 84248 Bratislava, Slovakia; (I.P.); (S.M.); (M.T.)
| | - Tibor Hianik
- Department of Nuclear Physics and Biophysics, Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynska dolina F1, 84248 Bratislava, Slovakia; (I.P.); (S.M.); (M.T.)
| | - Michael Thompson
- Lash Miller Laboratories, Department of Chemistry, University of Toronto, Toronto, ON M5S 3H6, Canada
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Yan B, Davachi SM, Ravanfar R, Dadmohammadi Y, Deisenroth TW, Pho TV, Odorisio PA, Darji RH, Abbaspourrad A. Improvement of vitamin C stability in vitamin gummies by encapsulation in casein gel. Food Hydrocoll 2021. [DOI: 10.1016/j.foodhyd.2020.106414] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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10
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Casein nanoparticles as oral delivery carriers of mequindox for the improved bioavailability. Colloids Surf B Biointerfaces 2020; 195:111221. [PMID: 32652401 DOI: 10.1016/j.colsurfb.2020.111221] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 06/23/2020] [Accepted: 06/24/2020] [Indexed: 11/22/2022]
Abstract
Mequindox (Meq) is a promising broad-spectrum antibacterial agent, but the clinical application of Meq has been hampered by its low oral bioavailability. Casein (Cas) can bind to a variety of poorly water-soluble drugs to improve their water solubility through a micellar solubilization mechanism. Here, a low-cost and convenient method was introduced to prepare mequindox-loaded casein nanoparticles (Meq-Cas). Meq-Cas was characterized by several methods including differential scanning calorimetry (DSC), X-ray diffraction (XRD), and fourier transform infrared (FTIR) to illuminate the mutual effect between the drug and carriers. Meq-Cas presented nearly spherical nanoparticles with smooth surfaces and its mean particle size was lower than untreated Cas. Meq-Cas showed a nearly complete release of Meq, which displayed a biphasic drug release pattern in both phosphate-buffered solution (PBS) and simulated gastric fluid (SGF). The relative oral bioavailability of Meq-Cas was found to be about 1.20 times higher than that of the animals treated with Meq suspension (control). These results suggest that Cas is a good candidate to load in Meq for pharmaceutical purposes.
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11
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Rehan F, Ahemad N, Gupta M. Casein nanomicelle as an emerging biomaterial—A comprehensive review. Colloids Surf B Biointerfaces 2019; 179:280-292. [DOI: 10.1016/j.colsurfb.2019.03.051] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Revised: 02/22/2019] [Accepted: 03/24/2019] [Indexed: 12/15/2022]
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Casein-Conjugated Gold Nanoparticles for Amperometric Detection of Leishmania infantum. BIOSENSORS-BASEL 2019; 9:bios9020068. [PMID: 31137793 PMCID: PMC6627895 DOI: 10.3390/bios9020068] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2019] [Revised: 04/24/2019] [Accepted: 04/25/2019] [Indexed: 12/11/2022]
Abstract
Sensitive and reliable approaches targeting the detection of Leishmania are critical for effective early diagnosis and treatment of leishmaniasis. In this frame, this paper describes a rapid quantification assay to detect Leishmania parasites based on the combination of the electrocatalytic ability of gold nanoparticles (AuNPs) to act as a catalyst for the hydrogen formation reaction along with the specificity of the interaction between casein and the major surface protease of the Leishmania parasite, GP63. First, pure and casein-modified AuNPs were prepared and characterized by scanning electron microscopy and ultraviolet-visible spectroscopy. Then, casein-conjugated AuNPs were incubated with Leishsmania parasites in solution; the formed complex was collected by centrifugation, treated by acidic solution, and the pelleted AuNPs were placed on screen-printed carbon electrodes (SPCEs) and chronoamperometric measurements were carried out. Our results suggest that it is possible to detect Leishmania parasites, with a limit less than 1 parasite/mL. A linear response over a wide concentration interval, ranging from 2 × 10-2 to 2 × 105 parasites/mL, was achieved. Additionally, a pretreatment of Leishmania parasites with Amphotericin B, diminished their interaction with casein. This findings and methodology are very useful for drug efficacy assessment.
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Selvaraj S, Thangam R, Fathima NN. Electrospinning of casein nanofibers with silver nanoparticles for potential biomedical applications. Int J Biol Macromol 2018; 120:1674-1681. [PMID: 30268753 DOI: 10.1016/j.ijbiomac.2018.09.177] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 09/25/2018] [Accepted: 09/26/2018] [Indexed: 10/28/2022]
Abstract
Casein, a major protein content in the milk has been extensively used in drug delivery due to its unique structural features. Fabrication of nanofibers from casein along with nanoparticles for tissue engineering applications has been explored in this study. Nanofibers fabrication is achieved by co-electrospinning of casein with poly (ethylene oxide) in sodium dodecyl sulphate (SDS) aqueous solution. Stabilization of silver nanoparticles has been achieved by the presence of SDS in the nanofiber matrix. The influence of conductivity on the nanofiber fabrication has also been studied. The nanofibrous mats have been characterized using techniques such as scanning electron microscope (SEM) and high resolution-transmission electron microscope (HR-TEM). Antimicrobial properties of the nanofibers have been assessed and the cellular biocompatibility of the material has been evaluated using cultured fibroblast (NIH-3T3) cells. Silver nanoparticles incorporated nanofibers showed good antimicrobial property against both gram negative and gram positive bacteria. In addition, the nanofiber matrix exhibited good biocompatibility for the fibroblast cell proliferation. These results pave the way for extending the use of casein based nanofibers in the skin care applications.
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Affiliation(s)
- Sowmya Selvaraj
- Inorganic and Physical Chemistry Laboratory, CSIR- Central Leather Research Institute, Adyar, Chennai 600020, India
| | - Ramar Thangam
- Center for Academy and Research Excellence (CARE), CSIR- Central Leather Research Institute, Adyar, Chennai 600020, India
| | - Nishter Nishad Fathima
- Inorganic and Physical Chemistry Laboratory, CSIR- Central Leather Research Institute, Adyar, Chennai 600020, India.
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Sayhi M, Ouerghi O, Belgacem K, Arbi M, Tepeli Y, Ghram A, Anik Ü, Österlund L, Laouini D, Diouani MF. Electrochemical detection of influenza virus H9N2 based on both immunomagnetic extraction and gold catalysis using an immobilization-free screen printed carbon microelectrode. Biosens Bioelectron 2018; 107:170-177. [DOI: 10.1016/j.bios.2018.02.018] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Revised: 02/03/2018] [Accepted: 02/05/2018] [Indexed: 01/25/2023]
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Gukowsky JC, Tan C, Han Z, He L. Cysteamine-Modified Gold Nanoparticles as a Colorimetric Sensor for the Rapid Detection of Gentamicin. J Food Sci 2018; 83:1631-1638. [PMID: 29786853 DOI: 10.1111/1750-3841.14179] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 04/04/2018] [Accepted: 04/09/2018] [Indexed: 11/26/2022]
Abstract
A simple, rapid, and specific colorimetric method for gentamicin detection using cysteamine-modified gold nanoparticles (cys-AuNPs) has been developed. The maximum residue limits of gentamicin allowed in foods are typically below 100 nM, so an effective detection method for low concentrations of the drug is required. The aggregation of gold nanoparticles (AuNPs) was used as the basis for this method, and adding cysteamine to the AuNPs helped to enhance their aggregative abilities. The cys-AuNPs are capable of detecting gentamicin concentrations as low as 12.45 nM in water, which could be quantified using UV-vis spectroscopy. Samples extracted from skim milk with a simple pretreatment showed that gentamicin concentrations down to at least 100 nM could be observed using the cys-AuNPs. This study demonstrates the ability of the cys-AuNPs to rapidly detect and quantify gentamicin in both simple and complex matrices. PRACTICAL APPLICATION This study demonstrates that cysteamine-modified gold nanoparticles could be used as a rapid and efficient tool for gentamicin detection. This technique is cheaper, simpler, and more effective than many other methods that are currently used for detecting the antibiotic in industrial and commercial applications. It has a great potential to be practically applied as a rapid screening method for gentamicin and gentamicin-like compounds in food and environmental samples.
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Affiliation(s)
- Joshua C Gukowsky
- Dept. of Food Science, Univ. of Massachusetts Amherst, 102 Holdsworth Way, Amherst, MA 01003, U.S.A
| | - Chen Tan
- Dept. of Food Science, Univ. of Massachusetts Amherst, 102 Holdsworth Way, Amherst, MA 01003, U.S.A
| | - Zexiang Han
- Dept. of Food Science, Univ. of Massachusetts Amherst, 102 Holdsworth Way, Amherst, MA 01003, U.S.A.,St. David's School, 3400 White Oak Road, Raleigh, NC 27609, U.S.A
| | - Lili He
- Dept. of Food Science, Univ. of Massachusetts Amherst, 102 Holdsworth Way, Amherst, MA 01003, U.S.A
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Mesoporous calcium phosphate using casein as a template: Application to bovine serum albumin sorption. Colloids Surf B Biointerfaces 2017; 158:480-487. [PMID: 28735220 DOI: 10.1016/j.colsurfb.2017.07.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 05/31/2017] [Accepted: 07/05/2017] [Indexed: 12/28/2022]
Abstract
Mesoporous hydroxyapatites were synthesized at room temperature using casein as a template, and key experimental factors, such as casein concentration, pH and extraction of casein in the final solids by washing and thermal treatment, were systematically investigated. The X-Ray Diffraction (XRD) patterns confirmed the synthesis of well-crystallized hydroxyapatite. The N2 adsorption/desorption isotherms were in agreement with the formation of mesoporous hydroxyapatite with a maximum surface area of 106m2g-1. Infrared spectroscopy and thermogravimetry analysis were performed to investigate the extraction of casein in water in the post-synthesis stage. Pure mesoporous hydroxyapatite exhibited good BSA adsorption capacity higher than the one obtained for conventional hydroxyapatite.
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17
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Ten-Doménech I, Simó-Alfonso EF, Herrero-Martínez JM. Isolation of human milk whey proteins by solid phase extraction with a polymeric material modified with gold nanoparticles. Microchem J 2017. [DOI: 10.1016/j.microc.2017.03.058] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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Kar P, Maji TK, Sarkar PK, Sardar S, Pal SK. Direct observation of electronic transition–plasmon coupling for enhanced electron injection in dye-sensitized solar cells. RSC Adv 2016. [DOI: 10.1039/c6ra18954g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We illustrate experimental evidence of the effect of surface plasmon resonance (SPR) of a noble metal on the ultrafast-electron injection efficiencies of a sensitizing dye in proximity of a wide band gap semiconductor.
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Affiliation(s)
- Prasenjit Kar
- Department of Chemical, Biological and Macromolecular Sciences
- S. N. Bose National Centre for Basic Sciences
- Kolkata 700 106
- India
| | - Tuhin Kumar Maji
- Department of Chemical, Biological and Macromolecular Sciences
- S. N. Bose National Centre for Basic Sciences
- Kolkata 700 106
- India
| | - Probir Kumar Sarkar
- Department of Chemical, Biological and Macromolecular Sciences
- S. N. Bose National Centre for Basic Sciences
- Kolkata 700 106
- India
| | - Samim Sardar
- Department of Chemical, Biological and Macromolecular Sciences
- S. N. Bose National Centre for Basic Sciences
- Kolkata 700 106
- India
| | - Samir Kumar Pal
- Department of Chemical, Biological and Macromolecular Sciences
- S. N. Bose National Centre for Basic Sciences
- Kolkata 700 106
- India
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Gu J, Catchmark JM. Polylactic acid composites incorporating casein functionalized cellulose nanowhiskers. J Biol Eng 2013; 7:31. [PMID: 24341897 PMCID: PMC3917613 DOI: 10.1186/1754-1611-7-31] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Accepted: 11/29/2013] [Indexed: 11/10/2022] Open
Abstract
Background Polylactic acid (PLA) is considered to be a sustainable alternative to petroleum-based polymers for many applications. Using cellulose fiber to reinforce PLA is of great interest recently due to its complete biodegradability and potential improvement of the mechanical performance. However, the dispersion of hydrophilic cellulose fibers in the hydrophobic polymer matrix is usually poor without using hazardous surfactants. The goal of this study was to develop homogenously dispersed cellulose nanowhisker (CNW) reinforced PLA composites using whole milk casein protein, which is an environmentally compatible dispersant. Results In this study, whole milk casein was chosen as a dispersant in the PLA-CNW system because of its potential to interact with the PLA matrix and cellulose. The affinity of casein to PLA was studied by surface plasmon resonance (SPR) imaging. CNWs were functionalized with casein and used as reinforcements to make PLA composites. Fluorescent staining of CNWs in the PLA matrix was implemented as a novel and simple way to analyze the dispersion of the reinforcements. The dispersion of CNWs in PLA was improved when casein was present. The mechanical properties of the composites were studied experimentally. Compared to pure PLA, the PLA composites had higher Young’s modulus. Casein (CS) functionalized CNW reinforced PLA (PLA-CS-CNW) at 2 wt% filler content maintained higher strain at break compared to normal CNW reinforced PLA (PLA-CNW). The Young’s modulus of PLA-CS-CNW composites was also higher than that of PLA-CNW composites at higher filler content. However, all composites exhibited lower strain at break and tensile strength at high filler content. Conclusions The presence of whole milk casein improved the dispersion of CNWs in the PLA matrix. The improved dispersion of CNWs provided higher modulus of the PLA composites at higher reinforcement loading and maintained the strain and stress at break of the composites at relatively low reinforcement loading. The affinity of the dispersant to PLA is important for the ultimate strength and stiffness of the composites.
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Affiliation(s)
| | - Jeffrey M Catchmark
- Intercollege Graduate Degree Program in Plant Biology, The Pennsylvania State University, University Park, PA 16802, USA.
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Physicochemical properties of protein-modified silver nanoparticles in seawater. INTERNATIONAL NANO LETTERS 2013. [DOI: 10.1186/2228-5326-3-54] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Elzoghby AO, Helmy MW, Samy WM, Elgindy NA. Spray-dried casein-based micelles as a vehicle for solubilization and controlled delivery of flutamide: Formulation, characterization, and in vivo pharmacokinetics. Eur J Pharm Biopharm 2013; 84:487-96. [DOI: 10.1016/j.ejpb.2013.01.005] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Revised: 01/07/2013] [Accepted: 01/09/2013] [Indexed: 01/10/2023]
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Liu Y, Liu L, Yuan M, Guo R. Preparation and characterization of casein-stabilized gold nanoparticles for catalytic applications. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2012.08.050] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Espinoza-Castañeda M, de la Escosura-Muñiz A, González-Ortiz G, Martín-Orúe SM, Pérez JF, Merkoçi A. Casein modified gold nanoparticles for future theranostic applications. Biosens Bioelectron 2012; 40:271-6. [PMID: 22884001 DOI: 10.1016/j.bios.2012.07.042] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2012] [Revised: 07/03/2012] [Accepted: 07/21/2012] [Indexed: 12/20/2022]
Abstract
The synthesis and characterization of gold nanoparticles (AuNPs 20 nm sized) modified with k-casein derived peptides in order to monitor the peptide effect as bacterial adhesion inhibitor, thanks to the carrier/concentrator effect of the AuNPs is here presented. Some aspects related to the stability of AuNP/peptide conjugates for a potential application in the design of an electrochemical biosensor for pathogen bacteria detection are also discussed. This peptide based nanoparticle assay takes advantage of the dual character of the AuNPs: as carrier of the biorecognition molecule and also as electrocatalytic label, allowing the evaluation of the pathogen bacteria-peptide interaction in a simple and rapid way through the chronoamperometric monitoring of the hydrogen evolution reaction on screen-printed carbon electrodes. The developed proof of concept theranostic system may open the way to therapeutic and biosensing applications with interest for various fields.
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Affiliation(s)
- Marisol Espinoza-Castañeda
- Nanobioelectronics & Biosensors Group, CIN2 (ICN-CSIC), Catalan Institute of Nanotechnology, Campus UAB, Bellaterra (Barcelona), Spain
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Sangeetha J, Philip J. The interaction, stability and response to an external stimulus of iron oxide nanoparticle–casein nanocomplexes. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.04.049] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Zhang H, Smith JA, Oyanedel-Craver V. The effect of natural water conditions on the anti-bacterial performance and stability of silver nanoparticles capped with different polymers. WATER RESEARCH 2012; 46:691-699. [PMID: 22169660 DOI: 10.1016/j.watres.2011.11.037] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Revised: 10/07/2011] [Accepted: 11/11/2011] [Indexed: 05/28/2023]
Abstract
This study evaluated the effect of natural water composition onto the bactericidal and physicochemical properties of silver nanoparticles (AgNPs) stabilized with three different polymeric compounds. All the nanoparticles behaved similarly in the water conditions tested. Compared to solutions with low organic matter content and monovalent ions, lower disinfection performances of AgNPs suspensions were obtained in the following order seawater ≤ high organic matter content water ≤ high divalent cations content synthetic water. Suspension of AgNPs in seawater and water with divalent cations (Ca(2+) and Mg(2+)) formed larger AgNPs aggregates (less than 1400 nm) compared to other solutions tested (up to approximately 38 nm). The critical coagulation concentration (CCC) of AgNPs was determined to quantitatively evaluate the stability of the nanoparticle suspension in different water conditions. When the concentration of dissolved organic matter was increased from 0 mg/L to 5 mg/L, the CCC increased by a factor in the range of 2.19 ± 0.25 for all AgNPs in divalent solutions, but a smaller increase occurred, in the range of 1.54 ± 0.21 fold, when monovalent solutions were used. The concentration of ionic silver released indicated that the dissolved Ag(+) (3.6-48.2 ppb) was less than 0.5% of the total mass of Ag(0) added. At all the conditions tested, the concentration of silver ions in solution had a negligible contribution to the overall anti-bacterial performance of AgNPs. This study demonstrated that the anti-bacterial performance of AgNPs at selected natural water conditions decreases in the presence of dissolved natural organic matter or divalent ions, such as humic acid and calcium carbonate. These results may be helpful in understanding the toxicity of AgNP in various natural water conditions and in explaining the risk associated with discharging AgNP in natural aquatic systems.
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Affiliation(s)
- Hongyin Zhang
- Department of Civil and Environmental Engineering, University of Rhode Island, Bliss Hall 213, Kingston, RI 02881, USA
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Soejima T, Oshiro S, Nakatsuji Y, Ito S. Dense aqueous colloidal gold nanoparticles prepared from highly concentrated precursor solution. J Colloid Interface Sci 2011; 362:325-9. [DOI: 10.1016/j.jcis.2011.07.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2011] [Revised: 07/01/2011] [Accepted: 07/02/2011] [Indexed: 12/01/2022]
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Elzoghby AO, Abo El-Fotoh WS, Elgindy NA. Casein-based formulations as promising controlled release drug delivery systems. J Control Release 2011; 153:206-16. [DOI: 10.1016/j.jconrel.2011.02.010] [Citation(s) in RCA: 334] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2010] [Accepted: 02/09/2011] [Indexed: 01/06/2023]
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Panagopoulou MA, Stergiou DV, Roussis IG, Prodromidis MI. Impedimetric biosensor for the assessment of the clotting activity of rennet. Anal Chem 2011; 82:8629-36. [PMID: 20845927 DOI: 10.1021/ac1017925] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cheese production is relied upon the action of rennet (a mixture of chymosin and pepsin) onto casein micelles of milk. For the first time, the monitoring of this interaction with electrochemical impedance spectroscopy (EIS) was used to develop a faradic impedimetric biosensor for the assessment of the clotting activity of rennet, using hexacyanoferrate(II)/(III) couple as a redox probe. Gold electrodes were modified with self-assembled monolayers of different thiols (thioctic acid, dithiobis-N-succinimidyl propionate, and cysteamine), and (artificial) casein micelles were immobilized on the modified gold surfaces. The proposed method is based on the measurement of charge-transfer resistance (R(ct)) changes attributed to the degradation of the negatively charged immobilized casein micelles by rennet to neutral biostructures. This action results in the increase of the flux of the redox probe, which exists in the bulk solution, to the surface of the electrode and, consequently, in the decrease of R(ct). Experimental parameters such as the micelle loading, the reaction time, the concentration of rennet, and the working pH, were optimized. Besides EIS measurements, cyclic voltammetry, FT-IR, and atomic force microscopy (AFM) experiments were also performed before and after the interaction of the immobilized micelles with rennet. Finally, the proposed biosensors were successfully tried for various commercial samples.
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Affiliation(s)
- Maria A Panagopoulou
- Laboratory of Analytical Chemistry, Department of Chemistry, University of Ioannina, 451 10 Ioannina, Greece
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A visual tutorial on the synthesis of gold nanoparticles. Biomed Imaging Interv J 2010; 6:e9. [PMID: 21611068 PMCID: PMC3097789 DOI: 10.2349/biij.6.1.e9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2009] [Revised: 11/03/2009] [Accepted: 11/13/2009] [Indexed: 02/06/2023] Open
Abstract
Many papers have been written on the synthesis of gold nanoparticles but very few included pictures of the process, and none of them used video to show the whole process of synthesis. This paper records the process of synthesis of gold nanoparticles using video clips. Every process from cleaning of glassware, an important step in the synthesis of metallic nanoparticles, to the dialysis process is shown. It also includes the preparation of aqua regia and the actual synthesis of gold nanoparticles. In some papers, the dialysis process was omitted, but in this paper, it is included to complete the whole process as it is being used for purification.
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