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Alanine rich amphiphilic peptides as green substitutes for hydrate inhibitors: a molecular simulation study. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.121008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Characterization and Viability Prediction of Commercial Probiotic Supplements under Temperature and Concentration Conditioning Factors by NIR Spectroscopy. FERMENTATION-BASEL 2022. [DOI: 10.3390/fermentation8020066] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The quality of probiotics has been associated with bacteria and yeast strains’ contents and their stability against conditioning factors. Near-infrared spectroscopy (NIRS), as a non-destructive, fast, real-time, and cost-effective analytical technique, can provide some advantages over more traditional food quality control methods in quality evaluation. The aim of our study was to evaluate the applicability of NIRS to the characterization and viability prediction of three commercial probiotic food supplement powders containing lactic acid bacteria (LAB) subjected to concentration and temperature conditioning factors. For each probiotic, 3 different concentrations were considered, and besides normal preparation (25 °C, control), samples were subjected to heat treatment at 60 or 90 °C and left to cool down until reaching room temperature prior to further analysis. Overall, after applying chemometrics to the NIR spectra, the obtained principal component analysis-based linear discriminant analysis (PCA-LDA) classification models showed a high accuracy in both recognition and prediction. The temperature has an important impact on the discrimination of samples. According to the concentration, the best models were identified for the 90 °C temperature treatment, reaching 100% average correct classification for recognition and over 90% for prediction. However, the prediction accuracy decreased substantially at lower temperatures. For the 25°C temperature treatment, the prediction accuracy decreased to nearly 60% for 2 of the 3 probiotics. Moreover, according to the temperature level, both the recognition and prediction accuracies were close to 100%. Additionally, the partial least square regression (PLSR) model achieved respectable values for the prediction of the colony-forming units (log CFU/g) of the probiotic samples, with a determination coefficient for prediction (R2Pr) of 0.82 and root mean square error for prediction (RMSEP) of 0.64. The results of our study show that NIRS is a fast, reliable, and promising alternative to the conventional microbiology technique for the characterization and prediction of the viability of probiotic supplement drink preparations.
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Dai Y, Yue N, Huang W, Qian H. Fragment synthesis of disulfide-containing peptides. MethodsX 2020; 7:100945. [PMID: 32577409 PMCID: PMC7303597 DOI: 10.1016/j.mex.2020.100945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Accepted: 05/27/2020] [Indexed: 11/24/2022] Open
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Monitoring of Water Spectral Pattern Reveals Differences in Probiotics Growth When Used for Rapid Bacteria Selection. PLoS One 2015; 10:e0130698. [PMID: 26133176 PMCID: PMC4489812 DOI: 10.1371/journal.pone.0130698] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Accepted: 05/23/2015] [Indexed: 12/26/2022] Open
Abstract
Development of efficient screening method coupled with cell functionality evaluation is highly needed in contemporary microbiology. The presented novel concept and fast non-destructive method brings in to play the water spectral pattern of the solution as a molecular fingerprint of the cell culture system. To elucidate the concept, NIR spectroscopy with Aquaphotomics were applied to monitor the growth of sixteen Lactobacillus bulgaricus one Lactobacillus pentosus and one Lactobacillus gasseri bacteria strains. Their growth rate, maximal optical density, low pH and bile tolerances were measured and further used as a reference data for analysis of the simultaneously acquired spectral data. The acquired spectral data in the region of 1100-1850nm was subjected to various multivariate data analyses - PCA, OPLS-DA, PLSR. The results showed high accuracy of bacteria strains classification according to their probiotic strength. Most informative spectral fingerprints covered the first overtone of water, emphasizing the relation of water molecular system to cell functionality.
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Finneman JI, Pozzo MJ. Novel approach for optimization of a ‘difficult’ peptide synthesis by utilizing quantitative reaction monitoring assays. J Pept Sci 2012; 18:511-8. [PMID: 22764082 DOI: 10.1002/psc.2428] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2012] [Revised: 05/09/2012] [Accepted: 05/21/2012] [Indexed: 11/09/2022]
Affiliation(s)
- Jari I. Finneman
- Department of Bioprocess Research and Development; Pfizer Global Biologics; 700 Chesterfield Parkway West; Chesterfield; MO; 63017; USA
| | - Mark J. Pozzo
- Department of Bioprocess Research and Development; Pfizer Global Biologics; 700 Chesterfield Parkway West; Chesterfield; MO; 63017; USA
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Potyrailo R, Rajan K, Stoewe K, Takeuchi I, Chisholm B, Lam H. Combinatorial and high-throughput screening of materials libraries: review of state of the art. ACS COMBINATORIAL SCIENCE 2011; 13:579-633. [PMID: 21644562 DOI: 10.1021/co200007w] [Citation(s) in RCA: 178] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Rational materials design based on prior knowledge is attractive because it promises to avoid time-consuming synthesis and testing of numerous materials candidates. However with the increase of complexity of materials, the scientific ability for the rational materials design becomes progressively limited. As a result of this complexity, combinatorial and high-throughput (CHT) experimentation in materials science has been recognized as a new scientific approach to generate new knowledge. This review demonstrates the broad applicability of CHT experimentation technologies in discovery and optimization of new materials. We discuss general principles of CHT materials screening, followed by the detailed discussion of high-throughput materials characterization approaches, advances in data analysis/mining, and new materials developments facilitated by CHT experimentation. We critically analyze results of materials development in the areas most impacted by the CHT approaches, such as catalysis, electronic and functional materials, polymer-based industrial coatings, sensing materials, and biomaterials.
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Affiliation(s)
- Radislav Potyrailo
- Chemistry and Chemical Engineering, GE Global Research Center, Niskayuna, New York 12309, United States
| | - Krishna Rajan
- Department of Materials Science and Engineering and Institute for Combinatorial Discovery, Iowa State University, Ames, Iowa 50011, United States
| | - Klaus Stoewe
- Universität des Saarlandes, Technische Chemie, Campus C4.2, 66123, Saarbruecken, Germany
| | - Ichiro Takeuchi
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Bret Chisholm
- Center for Nanoscale Science and Engineering and Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, North Dakota 58102, United States
| | - Hubert Lam
- Chemistry and Chemical Engineering, GE Global Research Center, Niskayuna, New York 12309, United States
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Mejac I, Tran CD. Visualizing the Effect of Gold Nanocages on Absorption, Imaging, and Lower Critical Solution Temperature Phase Transition of Individual Poly(NiPAM)-Based Hydrogel Particles by Near Infrared Multispectral Imaging Microscopy. Anal Chem 2011; 83:3520-7. [DOI: 10.1021/ac103354z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Irena Mejac
- Department of Chemistry, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin 53201, United States
| | - Chieu D. Tran
- Department of Chemistry, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin 53201, United States
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Duri S, Majoni S, Hossenlopp JM, Tran CD. Determination of Chemical Homogeneity of Fire Retardant Polymeric Nanocomposite Materials by Near-Infrared Multispectral Imaging Microscopy. ANAL LETT 2010. [DOI: 10.1080/00032711003653882] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Mejac I, Bryan WW, Lee TR, Tran CD. Visualizing the size, shape, morphology, and localized surface plasmon resonance of individual gold nanoshells by near-infrared multispectral imaging microscopy. Anal Chem 2010; 81:6687-94. [PMID: 19618908 DOI: 10.1021/ac9007495] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have successfully utilized the newly developed near-infrared multispectral imaging (NIR-MSI) microscope to observe and measure directly the localized surface plasmon absorption (LSPR) of individual gold nanoshells. The NIR-MSI is suited for this task because it can simultaneously record spectral and spatial information of a sample with high sensitivity (single pixel resolution) and high spatial resolution (approximately 0.9 microm/pixel). Importantly, the LSPR of individual nanoshells measured by the NIR-MSI microscope agrees well with the spectra calculated theoretically using Mie scattering for the nanoshells (i.e., nanoshells with silica cores approximately 800 nm in diameter and gold shell thicknesses of approximately 35 nm). Additionally, the NIR-MSI microscope enables measurement of LSPR at different positions within a single nanoshell. LSPR spectra were found to be distinct at various positions within a single nanoshell. Since LSPR spectra are known to depend on the shape and morphology of the nanoshells, these results seem to suggest that the individual nanoshells are not smooth and well-defined, but are rather rough and inhomogeneous. The LSPR spectra of single nanoshells in several different solvents were also examined using NIR-MSI and were found to depend on the dielectric constant of the medium. However, the relationship was discovered to be more complex than simply following the Drude equation. Specifically, when (lambda(max)/fwhm)(2) values of LSPR for single gold nanoshells were plotted as a function of 2n(2) (or 2epsilon) for nanoshells in six different solvents, a linear relationship was found for only three solvents: D(2)O, acetonitrile-d(3), and ethyl acetate. Acetone-d(6) showed a slight deviation, whereas formamide and pyridine-d(5) exhibited distinctly different correlations.
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Affiliation(s)
- Irena Mejac
- Department of Chemistry, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin 53201, USA
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Mejac I, Park HH, Bryan WW, Lee TR, Tran CD. Visualizing the Lower Critical Solution Temperature Phase Transition of Individual Poly(Nipam)-Based Hydrogel Particles Using Near-Infrared Multispectral Imaging Microscopy. Anal Chem 2010; 82:1698-704. [DOI: 10.1021/ac902099d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Irena Mejac
- Department of Chemistry, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin 53201, Department of Chemistry, University of Houston, 4800 Calhoun Road, Houston, Texas 77204
| | - Hye-Hun Park
- Department of Chemistry, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin 53201, Department of Chemistry, University of Houston, 4800 Calhoun Road, Houston, Texas 77204
| | - William W. Bryan
- Department of Chemistry, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin 53201, Department of Chemistry, University of Houston, 4800 Calhoun Road, Houston, Texas 77204
| | - T. Randall Lee
- Department of Chemistry, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin 53201, Department of Chemistry, University of Houston, 4800 Calhoun Road, Houston, Texas 77204
| | - Chieu D. Tran
- Department of Chemistry, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin 53201, Department of Chemistry, University of Houston, 4800 Calhoun Road, Houston, Texas 77204
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Minogue EM, Havrilla GJ, Taylor TP, Warner BP, Burrell AK. An ultra high throughput, double combinatorial screening method of peptide–metal binding. NEW J CHEM 2006. [DOI: 10.1039/b603347d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Tran CD. Principles, Instrumentation, and Applications of Infrared Multispectral Imaging, An Overview. ANAL LETT 2005. [DOI: 10.1081/al-200047754] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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13
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Tran CD, Grishko VI. Determination of water contents in leaves by a near-infrared multispectral imaging technique. Microchem J 2004. [DOI: 10.1016/j.microc.2003.10.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Fountain W, Dumstorf K, Lowell AE, Lodder RA, Mumper RJ. Near-infrared spectroscopy for the determination of testosterone in thin-film composites. J Pharm Biomed Anal 2003; 33:181-9. [PMID: 12972083 DOI: 10.1016/s0731-7085(03)00345-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
More rapid, reproducible, and cost-effective methods to control product quality in the pharmaceutical industry continue to be a major emphasis, particularly with the FDA through its recent process analytical technologies (PAT) initiative. Many different methods have been used to determine the stability and content uniformity of a drug in various dosage forms; however, most of these methods include the destruction of the sample. Therefore, the development of nondestructive methods that allow the analysis of each individual dosage form has become the basis of much research. A new assay for the nondestructive determination of testosterone content in mucoadhesive bi-layer thin-film composites (TFCs) using near-infrared spectroscopy (NIR) was developed. Five sets of the circular films (n=5) with theoretical testosterone content of 0, 1, 2, 3, and 4 mg per 3/8th in. diameter disks were scanned in the near-infrared region of 1100-2500 nm to determine testosterone content. The NIR results were directly compared with those obtained using a previously developed ultraviolet assay for testosterone at 240 nm. Principal component regression (PCR) was performed to calibrate the NIR assay. This correlation produced r2=0.99 with a standard error of estimate (SEE)=0.18 mg, and a standard error of performance (SEP)=0.18 on cross validation with an equal number of samples (F test passed at P=0.05). Though the UV assay showed a slightly better r2 value, the NIR assay was much quicker, easier, and nondestructive. Therefore, the NIR assay may have significant potential for use in the quality control of pharmaceutical films containing drugs.
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Affiliation(s)
- William Fountain
- Division of Pharmaceutical Sciences, Center for Pharmaceutical Science and Technology, College of Pharmacy, University of Kentucky, Lexington, KY 40536-0082, USA
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Tran CD, Politi M. Visualizing chemical compositions and kinetics of sol-gel by near-infrared multispectral imaging technique. Anal Chem 2002; 74:1604-10. [PMID: 12033251 DOI: 10.1021/ac011194j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Kinetics of sol-gel formation were studied using the recently developed near-infrared (NIR) multispectral imaging instrument. This imaging spectrometer possesses all the advantages of conventional spectrometers. It also has additional features that NIR spectrometers cannot offer, namely, its ability to provide kinetic information at different positions within a sample. The high spatial resolution and sensitivity of the InSb camera make it possible for the imaging spectrometer to determine the kinetic from data recorded by a single pixel. Kinetics of sol-gel reactions, determined by this multispectral imaging instrument, show that the initial hydrolysis of the TEOS, MTES, or a mixture of these two alkoxysilanes is relatively inhomogeneous. The inhomogeneity is dependent on the number of pixels used to calculate the spectrum for each spot. Data calculated from a single pixel provide the largest inhomogeneity. No inhomogeneity was observed when an average of a large number of pixels (e.g., 10 x 10) is used for calculation. The inhomogeneities observed for TEOS sol-gels are different from those for the MTES sol-gels, and those for sol-gels prepared from a mixture of TEOS and MTES are relatively larger and more similar to those of the MTES sol-gels. A variety of reasons might account for the observed inhomogeneities including differences in the structure of the TEOS sol-gels and MTES sol-gels and the inability of the TEOS to mix well with MTES with the latter being more hydrophobic.
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Affiliation(s)
- Chieu D Tran
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201, USA
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Abstract
There are many new analytical techniques for the characterization of resin-bound substrates and solid-phase reaction monitoring. The aim of this review is to focus on applications of the different IR techniques used in solid-phase synthesis highlighting some of the recent advances in the field that allow us to obtain more than just the usual qualitative information. Many examples will be discussed where these new IR techniques have been used for mechanistic and kinetic studies of solid-phase reactions.
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Affiliation(s)
- Y R de Miguel
- Department of Chemistry, King's College London, Strand, London WC2R 2LS, United Kingdom.
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Workman J, Creasy KE, Doherty S, Bond L, Koch M, Ullman A, Veltkamp DJ. Process analytical chemistry. Anal Chem 2001; 73:2705-18. [PMID: 11432699 DOI: 10.1021/ac010364p] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J Workman
- Analytical Science & Technology, Kimberly-Clark Corporation, Neenah, Wisconsin 54956, USA
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Malik I, Poonacha M, Moses J, Lodder RA. Multispectral imaging of tablets in blister packaging. AAPS PharmSciTech 2001; 2:E9. [PMID: 14727884 PMCID: PMC2750475 DOI: 10.1208/pt020209] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
This experiment tested the hypothesis that using near-infrared (IR) imaging spectrometry on tablets through blister packs permits the identification and composition of multiple individual tablets to be determined simultaneously. Aspirin was selected for this study because its breakdown mechanism is well understood. Near-IR cameras were used to collect thousands of spectra simultaneously from a field of packaged aspirin tablets. Tablets were selected by a principal component analysis selection algorithm. Graphs of the columns of the transformation matrix showed that salicylic acid and acetylsalicylic acid in the samples were modeled by the principal components. The bootstrap error-adjusted single-sample technique chemometric-imaging algorithm was used to draw probability-density contour plots that revealed tablet composition. Choice of color was used to represent constituent identity, whereas intensity represented concentration. The percentage of usable pixels in the indium antimonide (InSb) array was 99.9%. The SEP was 0.06% of the tablet mass for both water uptake and salicylic acid production. The number of tablets that a typical near-IR camera can currently analyze simultaneously was also estimated to be approximately 1300.
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Affiliation(s)
- Imran Malik
- Division of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky Medical Center, 40536-0082 Lexington, KY
| | - Mela Poonacha
- Division of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky Medical Center, 40536-0082 Lexington, KY
| | - Jennifer Moses
- Division of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky Medical Center, 40536-0082 Lexington, KY
| | - Robert A. Lodder
- Division of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky Medical Center, 40536-0082 Lexington, KY
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Abstract
The main interests in the development of new combinatorial assays are the reduction of time for screening and an increase in the number of samples measured in parallel. The variety of detection methods is increasing, but the optimal one has not yet been determined. In the past two years, the first parallel detection methods for non-labelled compounds have been developed.
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Affiliation(s)
- G Gauglitz
- Institut für Physikalische und Theoretische Chemie, Universität Tübingen, Germany.
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Chemically sensitive high throughput parallel analysis of solid phase supported library members. JOURNAL OF COMBINATORIAL CHEMISTRY 2000; 2:243-5. [PMID: 10827930 DOI: 10.1021/cc990061x] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This paper introduces Fourier transform infrared imaging as a powerful spectroscopic tool for the parallel identification of members of resin-supported combinatorial libraries. This technique combines the chemical specificity and high sensitivity of FTIR with the ability to rapidly analyze multiple supported resin beads simultaneously. It is shown here that the chemical identity of ligands on a variety of supported resin beads can be identified in a single experiment without destroying or otherwise perturbing the system.
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