Detectors for Liquid Chromatography (Delete (Series: Volume 89 in Chemical Analysis: A Series of Monographs on Analytical Chemistry & Its Applications))

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This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

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A comparison of chiral separation and analysis of selenomethionine in breast and formula milk, using high performance liquid chromatography (HPLC) on a glycopeptide teicoplanin-based chiral stationary phase (Chirobiotic T), coupled to atomic fluorescence spectrometry (AFS) and inductively coupled plasma (ICP) MS detectors has been performed. The coupling HPLC-microwave-assisted digestion hydride generation requires on-line post-column analytes treatment, and a severe sample clean-up for fat and proteins elimination using centrifugation and ultrafiltration. Underivatized dl-selenomethionine enantiomers were completely resolved in 10min using unbuffered water mobile phase at 1mlmin^-^1 flow. Good selectivity and sensitivities (detection limits 3.1 and 3.5ngml^-^1 as Se for l- and d-selenomethionine, respectively) were obtained, and method robustness and simplicity, together to the low cost of AFS detector, makes it suitable for infant milk routine analysis. HPLC-ICP-MS coupling exhibits very low detection limits (0.9ngml^-^1, as Se) for each dl-selenomethionine enantiomers, but the method suffers from matrix influence, that produces a poor S/N ratio and low reliability. The methods were applied to breast and formula milk samples with recoveries of 80% of the total selenium presence, which is attributable to the existence of other unknown species. l-Selenomethionine was the only isomer present in breast milk, but a 30% of d-selenomethionine was also detected in formula milk.

A comparison of pulsed amperometric detection and spectrophotometric detection of carbohydrates in cider brandy by liquid chromatography [An article from: Analytica Chimica Acta]

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A comparison of pulsed amperometric detection and spectrophotometric detection of carbohydrates in cider brandy by liquid chromatography [An article from: Analytica Chimica Acta]
D. Blanco , D. Muro , and M.D. Gutierrez
Manufacturer: Elsevier
ProductGroup: Book
Binding: Digital

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ASIN: B000RQZZZW

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Determination of 13 synthetic food colorants in water-soluble foods by reversed-phase high-performance liquid chromatography coupled with diode-array detector [An article from: Analytica Chimica Acta]

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Determination of 13 synthetic food colorants in water-soluble foods by reversed-phase high-performance liquid chromatography coupled with diode-array detector [An article from: Analytica Chimica Acta]
K.S. Minioti , C.F. Sakellariou , and N.S. Thomaidis
Manufacturer: Elsevier
ProductGroup: Book
Binding: Digital

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ASIN: B000PDSIDS

Book Description

This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

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A reversed-phase high performance liquid chromatographic method for the successful separation and determination of 13 synthetic food colorants (Tartrazine E 102, Quinoline Yellow E 104, Sunset Yellow E 110, Carmoisine E 122, Amaranth E 123, Ponceau 4R E 124, Erythrosine E 127, Red 2G E 128, Allura Red AC E 129, Patent Blue V E 131, Indigo Carmine E 132, Brilliant Blue FCF E 133 and Green S E 142) was developed. A C18 stationary phase was used and the mobile phase contained an acetonitrile-methanol (20:80v/v) mixture and a 1% (m/v) ammonium acetate buffer solution at pH 7.5. Successful separation was obtained for all the compounds using an optimized gradient elution within 29min. The diode-array detector was used to monitor the colorants between 350 and 800nm. The method was thoroughly validated. Detection limits for all substances varied between 1.59 (E 142) and 22.1 (E 124)@mgL^-^1. The intra-day precision (as R.S.D."r) ranged from 0.37% (E 122 in fruit flavored drink at a concentration of 100mgL^-^1) to 4.8% (E 142 in icing sugar at a level of 0.9mgkg^-^1). The inter-day precision (as R.S.D."R) was between 0.86% for E 122 in fruit flavored drink at 100mgL^-^1 and 10% for E142 in jam at a concentration of 9mgkg^-^1. Satisfactory recoveries, ranging from 94% (E 142 in jam) to 102% (E 131 in sweets), were obtained. The method was applied to the determination of colorants in various water-soluble foods, such as fruit flavoured drinks, alcoholic drinks, jams, sugar confectionery and sweets, with simple pre-treatment (dilution or water extraction).

Determination of acrylamide in Chinese traditional carbohydrate-rich foods using gas chromatography with micro-electron capture detector and isotope dilution ... [An article from: Analytica Chimica Acta]

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Determination of acrylamide in Chinese traditional carbohydrate-rich foods using gas chromatography with micro-electron capture detector and isotope dilution ... [An article from: Analytica Chimica Acta]
Y. Zhang , Y. Ren , and H. Zhao
Manufacturer: Elsevier
ProductGroup: Book
Binding: Digital

Elsevier | By Publisher | e-Docs | Formats | Books
ASIN: B000PDSUVI

Book Description

This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

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The present study developed two analytical methods for quantification of acrylamide in complex food matrixes, such as Chinese traditional carbohydrate-rich foods. One is based on derivatization with potassium bromate and potassium bromide without clean-up prior to gas chromatography with micro-electron capture detector (GC-MECD). Alternatively, the underivatized acrylamide was detected by high-performance liquid chromatography coupled to quadrupole tandem mass spectrometry (HPLC-MS/MS) in the positive electrospray ionization mode. For both methods, the Chinese carbohydrate-rich samples were homogenized, defatted with petroleum ether and extracted with aqueous solution of sodium chloride. Recovery rates for acrylamide from spiked Chinese style foods with the spiking level of 50, 500 and 1000@mgkg^-^1 were in the range of 79-93% for the GC-MECD including derivatization and 84-97% for the HPLC-MS/MS method. Typical quantification limits of the HPLC-MSMS method were 4@mgkg^-^1 for acrylamide. The GC-MECD method achieved quantification limits of 10@mgkg^-^1 in Chinese style foods. Thirty-eight Chinese traditional foods purchased from different manufacturers were analyzed and compared with four Western style foods. Acrylamide contaminant was found in all of samples at the concentration up to 771.1 and 734.5@mgkg^-^1 detected by the GC and HPLC method, respectively. The concentrations determined with the two different quantitative methods corresponded well with each other. A convenient and fast pretreatment procedure will be optimized in order to satisfy further investigation of hundreds of samples.

Determination of Imidacloprid and metabolites by liquid chromatography with an electrochemical detector and post column photochemical reactor [An article from: Analytica Chimica Acta]

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Determination of Imidacloprid and metabolites by liquid chromatography with an electrochemical detector and post column photochemical reactor [An article from: Analytica Chimica Acta]
M. Rancan , A.G. Sabatini , G. Achilli , and G. Galletti
Manufacturer: Elsevier
ProductGroup: Book
Binding: Digital

Elsevier | By Publisher | e-Docs | Formats | Books
ASIN: B000RR6ZD2

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Determination of risedronate in rat plasma samples by ion-pair high-performance liquid chromatography with UV detector [An article from: Analytica Chimica Acta]

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Determination of risedronate in rat plasma samples by ion-pair high-performance liquid chromatography with UV detector [An article from: Analytica Chimica Acta]
H.J. Jia , W. Li , and K. Zhao
Manufacturer: Elsevier
ProductGroup: Book
Binding: Digital

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ASIN: B000RR7266

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This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

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In the present work, an analytical method for determination of risedronate, a member of bisphosphonates, is described for the routine analysis in rat plasma. Sample pre-treatment involves protein precipitation, co-precipitation with calcium at alkaline pH, hydrolysis of possible derivatives of pyrophosphate and reprecipitation. A good separation was obtained by using a reversed-phase column (Hypersil ODS-2 C"1"8, 4.6mmx250mm, 5@mm). The mobile phase was an aqueous solution of buffer (contained 1.5mM EDTA-2Na, 1mM sodium etidronate, 11mM sodium phosphate and 5mM tetrabutylammonium bromide as ion-pair reagent) - methanol (88:12, v/v) adjusted to pH 6.75 using 1M NaOH. The flow rate was 1mlmin^-^1. UV detection (@l=262nm) was used to quantitate risedronate in the concentration range of 10-500ngml^-^1. The limit of detection and quantitation for risedronate were 7 and 10ngml^-^1, respectively. The method was applied successfully to plasma samples from Wistar rats undergoing oral administration of risedronate mini-pills. Precision, extraction recoveries, as well as accuracy results, were satisfactory and no interference was found at the retention time of risedronate. Hence, the method is suitable for monitoring risedronate in rat plasma.

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Experiments at Harvard University and elsewhere have revealed mutations in bacteria induced by nutrient deprivation. These mutations, of the lac operon and other genes such as those that confer antibiotic resistance, arose under conditions ordinarily associated with natural selection.

One interpretation is that genetic variation and natural selection are two sides of a unitary and simultaneous process, the two sides of a general response to the struggle for existence caused by the Malthusian doctrine. Far from being random, the production of genetic variation (mutation) must be an innate capability of life, in the same way that the genetic conservatism, the metabolic reactions and the reproduction of organism are innate faculties and anything but random.

Adaptation, the survival of the fittest, far from the tautology it is sometimes presented as being, is on behalf of the acquisition of features whose primary expression is the relief of competition.

If generally true, this principle of competitive variation could be the basis for engineering evolution.

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The scope and span of this book brings together the story of railways in a historical and geographical context. This book describes the feats of the engineers who designed locomotives and bridges that made the world marvel and presents the work of the architects who created astonishing buildings for the new world of the railway.

It also tells how artists, writers and travelers - who had never before seen or imagined these extraordinary machines powered by fire and water and belching smoke, steam and noise - responded to the whole concept of railways. Chapter by chapter the book outlines the ways in which railways were a source of ideas and even of inspiration for writers, and how they were depicted in art, from the earliest lithographs to surrealist painting.

It covers the emergence of railway photography as a genre, the role of the railways in the movies and in music and it gives accounts of rail journeys made by all kinds of travelers from the very rich to the dispossessed. This book is a celebration of the railways and their enduring effect on our collective imagination.

Customer Reviews:

good start on Joyce.......2007-08-22

James Joyce lurks in my home, the mammoth Ulysses sitting heavily upon my shelf, mocking me, sending chills down the back of my neck and dashing thoughts of actually making it through the tome unscathed. So it was with much trepidation that I tackled this earlier work by Joyce.

I was most pleasantly surprised to discover this collection of Dublin tales to be very accessible, and while I no doubt missed much of the poetical allegory present in his work, following the basic meanings of the story was within my reach. Ulysses may be as different to this as Faulkner's As I Lay Dying was to The Sound and Fury, but I hope not.

An relatively easy and enjoyable start if trying to work your way through Joyce's works.

Not just "An Original," but "THE Original".......2006-08-23

This is the old father, the old artificer, of all 20th century short stories. Each story is a gem, and together they tell like a rosary. "The Dead," is by itself a masterpiece which resonates long after you've finished it. Dubliners is Joyce's most accessible work, readable and enjoyable without losing any of its deeper nuances.

The Lessons of Life in Dublin.......2005-01-05

The simplest of all of Joyce's works, Dubliners introduces the people and everyday life present in Dublin, Ireland. While the events can be described as quite mundane, each of the fifteen short stories subtly highlights a unique meaning in life. Though each is self-sustaining, it is much more gratifying to read the tales in the order published. They follow the natural course of human life, growing from childhood to adulthood to death. Joyce skillfully demonstrates a sequence of events that can happen to anyone throughout a lifetime.

However, if you are completely unhappy with the first stories, skip to the end and read "The Dead". There is no doubt in my mind that this is one of the best stories of fiction of its time - both in its use of language and its powerful messages. Actually a novella, this final story encompasses everything from politics to love to the inevitability of death rendering all else meaningless. While many people finish the Joyce's collection finding it to be one of the more depressing pieces of literature they have read, it really is not. For example, "The Dead" proves that death is essential to making a fresh start. Joyce did not intend to write to please others and leave them satisfied, but instead to portray reality in a grim city.

Just remember, after finishing Dubliners, you are one step closer to reading Ulysses!!

Great stories, great ciriticism.......2004-07-13

When he was a young man, James Joyce abandoned his hometown of Dublin, and yet, he never wrote about any other place. He had also rejected Catholicism, and yet all his characters are dominated by it. DUBLINERS, Joyce's collection of short stories which set the standard for the genre, is filled with characters who come to terrible revelations (which he called "epiphanies") about how their lives had been scarred by the provincialism of Dublin, the divisiveness of its politics, and the oppression of religion. By extension, this is how Joyce percieved humanity at the dawn of modernism.

The stories range from the psychologically simple ("Counterparts" and "A Little Cloud") to the extraordinarily complex ("A Painful Case" and "The Dead"). But what is common throughout is the feel for Dublin just after the turn of the last century. The readers see the cobblestones, the chimneys, the trams and carts, the churches, and the street lamps. More importantly, the readers feel the tensions underlying the public smiles and infrequent bursts of confidence that the characters exhibit.

The extra value of this Viking Critical edition is, of course, the criticism. The valuable notes help make the understanding of the reading much easier. And the critical essays, each single one, provides a deeper understanding of how to put these stories in a larger frame.

Beautiful, context-difficult, yet accessible collection.......2002-03-04

I suppose "Dubliners" as a collection of short stories is an excellent starting point for a newcomer to the literary world of James Joyce, for several reasons. The stories are written in plain English, a statement not to be under estimated, for Joyce is known for conscious, far-reaching experimentation within the English language, which ever since has inspired critics and theorists of literature, but at the same tame presented a common reader with a real challenge, ever so more overwhelming for the native speakers, not to mention those for whom English is a second, or third language. Joyce's most known works are as hard to read as they are to translate, this being the reason why "Finnegan's Wake" remains one famous book which is rarely translated, and even more seldom done so with any success whatsoever. "Dubliners" however comes nowhere close to the later-day experiments of this author, even if stories contained therein are thematically interconnected with "Ulysses". The prose is plain and captivating, often brutal, sometimes lyrical, but always dignified. Reading "Dubliners" is an adventure in itself, because if you happened to enter Joyce's world with the aforementioned volumes, you probably expected a similar experience. This book contains the very first literary attempts by this author, when although innovative in some respects, the stories fit well into the classical literary framework of the XIX century. Therefore, because of its accessibility, it's highly recommended to read "Dubliners" as your first volume by James Joyce. With this background, the ultimate task of dealing with "Ulysses", for it's a battle rather, than a casual reading, as Joyce himself projected, intended, and announced upon its publication - this task shall be much easier, and for once, even the reading of the aforementioned might prove successful and satisfying.

The stories contained in "Dubliners" are intriguing mainly because of their construction. Thematically interconnected, they constitute a coherent series of snapshots of Dublin, one of the largest cities in Europe at the time, and terribly under represented in literature. Characters appear as quickly as they fade away within the space of just a few pages, for you should know that the vast majority of stories in this volume are very short. So often the short stories are misunderstood, so often readers are genuinely perplexed. Unnecessarily so, because even if we agree that a short story should be brief and to the point, it's only too difficult to conceive a small pearl, which serves as a igniting spark of imagination, leaving the reader lost deeply in thoughts, genuinely affected by the content. It's not the case that everything should be explained, that the reader should be spoon-fed with logical presentation of events and causation. It's not the case that the ending of a short story should be definitive, so that there is nothing to subtract, nor anything to add when the last page is turned over. A good short story does not end with its last page, an observation I wish shall be helpful for you in your struggle with this literary form. It need not be a struggle, shouldn't be in fact, and if reading "Dubliners" will help you finding the answers on your own, so much the merrier.

Act after act in a play, we have a unique opportunity to see the real Dubliners, of all classes, occupations, with all different histories, lifetimes, passions, all types of human failure and success, all relative, built into the rich contextual background of Dublin, the city which should have been a capital of a country that also should have been but wasn't, at least not yet. These stories are not an assault on the storyline, as one might briskly attempt to categorize; their structure is classical, and yet Joyce contributed to the literary world by pushing the frontiers of the short story, at the same time retaining the compactness of the the contents despite of their enormous scope. It's not enough to read each story on its own, not in this volume. Although they are independent in the dimension of the storyline, the individual stories are essentially small jigsaw pieces of a puzzle; not in the sense of a greater, hidden meaning lurking there for a reader to discover, but in the sense of a multidimensional portrait of the city, the nation and its ailments, peculiarities and unique oddities. Much like Tyrmand's Varsaviana novels, "Dubliners" is an ode to Dublin, a city one loves so much to be sick of it, in Joyce's own words. There is a great deal to learn from James Joyce's "Dubliners", if you are so inclined, and the beautiful, accessible and yet context-difficult writing makes it a thoroughly enjoyable pleasure.

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Dubliners: Text and Criticism; Revised Edition (Viking Critical Library)
James Joyce
Manufacturer: Penguin Books
ProductGroup: Book
Binding: Paperback
ASIN: B000N78J76

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