analysis of food volatiles using headspace gas chromatographic techniques

... variance of sludge characteristics and activity, the comparison was made only on the basis of tests using the same batch of sludge sample Acetate and VFAs concentrations were verified using a ... DISCUSSIONS Figure shows a typical CO2/pH profile of sodium acetate addition in the CO2 profile; the rising time between the left foot of the slope and right edge of the peak was defined as the “E Time” ... carbon dioxide profiles were monitored until the reaction completed Unknown concentrations of sodium acetate were tested using the same procedure; their concentrations were estimated using the calibration...

Ngày tải lên: 05/09/2013, 08:40

... point of view, and the others often encounter convergence problems Moreover, only the mean value and the moments (often the variance only) are known, and since the density of probability of the ... convergence of the iterative scheme The smaller the spectral radius of |[G]|, the faster the convergence of the algorithm and the smaller the overestimation of the solution 4.2 TEST OF THE NEW ... Checking properties of interval matrices Technical Report 686, Institute of Computer Science, Academy of Sciences of the Czech Republic 17 S P Shary, apr 1995 SIAM Journal on Numerical Analysis, 32(2),...

Ngày tải lên: 12/01/2014, 21:45

... Chemistry of Foods C.S James, Blackie Academic and Professional 1.3.2 Tabulated Official Methods of Analysis A number of scientific organizations have been setup to establish certain techniques as official ... and the use of an official method The government has recently carried out a survey of many of the official analytical techniques developed to analyze foods, and has specified which techniques ... ANALYSIS OF FOOD PRODUCTS Introduction Food analysis is the discipline dealing with the development, application and study of analytical procedures for characterizing the properties of foods...

Ngày tải lên: 20/01/2014, 13:20

... analysis of peptides and proteins N D Udeshi et al dimethylation of Arg, monomethylation, dimethylation and trimethylation of Lys, acetylation and ubiquitination of Lys, and phosphorylation of ... period of minutes This latter requirement precludes the widespread use of ECD for the analysis of peptides and proteins in complex mixtures 6270 by mass spectrometers interfaced to a chromatographic ... versions of the L34 protein are present in a ratio of : 20 Analysis of the spectra recorded on the other peaks in the base peak ion chromatogram allowed us to detect and identify 46 of the 55...

Ngày tải lên: 18/02/2014, 16:20

... hypothesis testing of neoclassical benchmarks using the entire sample of households, but of course this approach foregoes the details of the behavior of individual households The application of the accounts ... c an analysis of household finance We demonstrate two different, but complementary, approaches to the analysis of household finance First, in chapter 5, we conduct a financial analysis of two ... Professor of Economics in the Department of Economics at the Massachusetts Institute of Technology He previously was the Charles E Merriam Distinguished Service Professor in the Department of...

Ngày tải lên: 07/03/2014, 15:20

... Dietary Fibre Analysis By D.A.T Southgate, Formerly of the AFRC Institute of Food Research, Norwich, UK Mass Spectrometry of Natural Substances in Food By F Mellon, Institute of Food Research, ... Staple Foods 4.3 Collection of Diet Samples 4.3.1 Collection and Preparation of Foods for Composition of Representative Mixed Total Daily Diets, Market Basket Method 4.3.2 Collection of Food Samples ... values of a set of data It is a good indication of scattering, and is very useful for rough comparisons of different sets of data It is not a good measure of deviation or distribution of data...

Ngày tải lên: 15/03/2014, 16:20

... Analysis of signaling networks using protein arrays H Voshol et al a contextual understanding of the molecular mechanisms of disease, but also has the potential to facilitate the validation of ... modulation of regulatory networks [5,6] A direct benefit of such an approach would be the early recognition of ‘off target’ and side effects of drug candidates [7], as well as the identification of putative ... translation of ‘physiology’ because Analysis of signaling networks using protein arrays they allow a sufficient level of granularity while integrating the basic organizing principles of the cellular...

Ngày tải lên: 16/03/2014, 00:20

... CaRd on Food- MaRketing poliCies an analysis oF Food and Summary The National Academies’ Institute of Medicine (IOM) concluded that television food advertising affects children’s food choices, food ... www.cspinet.org/nutritionpolicy Report Card on Food- Marketing Policies: An Analysis of Food and Entertainment Company Policies Regarding Food and Beverage Marketing to Children is available on-line, free of charge at www.cspinet.org/marketingreportcard ... that market food should be free of the marketing of low-nutrition foods We evaluated the strength of the companies’ nutrition or beverage products to children [should] standards, scope of media...

Ngày tải lên: 29/03/2014, 23:20

... Contents Chapter Selection of Techniques Used in Food Analysis Michael H Tunick Chapter Statistical Assessment of Results of Food Analysis Richard Brereton Chapter Analysis of Drinking Water ⁄ Marek ... different techniques for various purposes in food analysis The second chapter, “Statistical Assessment of Results of Food Analysis, ” provides an overview of the need for statistical assessment of the ... chlorophylls, food polyphenols, aroma compounds, food volatiles, sensory analysis of foods and determination of food allergens, genetically modified components, pesticide residues, pollutants in foods,...

Ngày tải lên: 23/05/2014, 12:30

... permit the use of genetic analysis to identify the complement of genes contributing to the generation of cell shape RNA interference (RNAi) has revolutionized the functional analysis of genes identified ... cytokinesis [21] RNAi targeting of members of a different group of genes resulted in a profound loss of actin filaments in both cell types, identifying known regulators of F-actin formation In Kc167 ... predicted cell-cycle regulators The ‘Profile’ column provides a summary of the phenotypic profiles distinguishing sets of genes involved in specific stages of the cell cycle The ‘Classification’...

Ngày tải lên: 06/08/2014, 18:20

... determination of Cl– by chitosan–Fe3+ membrane gave higher response than the chitosan–Cl– in the analysis of Cl– in terms of stability during measurements, near Nernstian slope and degree of correlation ... slope, –58.1 mV/dec and limit of detection, 2.511 x 10–6 M of Cl– compared to electrode A, –51.9 mV/dec and 3.981 x 10–5 M of Cl– (Table and Fig 1) Table 1: Characteristic of chitosan heterogeneous ... was obtained in chitosan–Fe3+ which probably because of The Potentiometric Analysis of Chloride Ion 48 thin membrane used and also elimination of swelling step during the permeation by hydrated...

Ngày tải lên: 07/08/2014, 14:20

... reflectance in the NIR and SWIR regions of the spectrum Analysis of vegetation spectra 519 Figure Summary of F-ratio tests of significance of the variance of the reflectance associated with a specific ... variance of a spectra The choice of r – degrees of freedom in the numerator of the F-ratio test instead of was adopted to keep the experiment-wide error rate at 0.05 or better [38] The number of retained ... of parameters to be estimated p falls below 1.0 most popular techniques of multivariate analysis fail due to singularity Analysis of vegetation spectra 521 Figure Observed (gray), fitted group...

Ngày tải lên: 08/08/2014, 01:22

... determination of the structural parameters of the canopy, requiring a single transect performed in overcast conditions [9] [9] observed an underestimation of about 30 % when using all rings and11% when using ... merits of both techniques The estimations obtained using these methods are not totally satisfying [4, 10, 18] Estimated values of L are highly correlated to direct measurements but they often ... to the base of the live crown and the diameter and age of all branches The total leaf area of these 26 trees was determined using a three-step procedure: 1) At shoot level, a sample of 582 leafy...

Ngày tải lên: 08/08/2014, 14:21

... the square root of the sum of squares of the displacements seen in the directions was calculated The amount of isocenter shift of serial CT scans was assessed using analysis of variance (ANOVA) ... square root of the sum of squares of the SD of systematic and random error Quality control procedures at the CT scanner, simulation room and linear accelerator were performed The accuracy of coincidence ... box consisted of a skeletal aluminium box attached onto the mask system The position of the treatment isocenter and the shapes of the beam projections were generated on four pieces of transparency...

Ngày tải lên: 09/08/2014, 10:20

... Paunovic M, et al.: Analysis of one million base pairs of Neanderthal DNA Nature 2006, 444:330-336 51 Kellis M, Birren BW, Lander ES: Proof and evolutionary analysis of ancient genome duplication ... roughly half of the total increase in growth rate) in any of the five populations resulted from mutations in genes encoding the two major subunits of RNA polymerase (rpoB and rpoC) In three of the ... variant of rpoB or rpoC within 25 days from the start of the experiment The reason that these changes were beneficial is unknown Two of these populations subsequently experienced a sweep of secondary...

Ngày tải lên: 14/08/2014, 17:22

Ngày tải lên: 29/11/2014, 06:59

... subjects, instruments of data collection and methods of data analysis Chapter 3: Presentation and analysis of data Chapter four presents the statistical results and the analysis of the collected data ... of overview of the study, the participants, instrument of data collection and methods of data analysis of the study in detail 2.1 Overview This paper is devoted to investigating the misuses of ... School, from my observation, often make errors in using articles in writing As an English language teacher, the researcher is aware of the importance of the error analysis in using articles and really...

Ngày tải lên: 28/03/2015, 09:22

... evaluation gave a best straight line with a slope of 1.91, an intercept of 0.128 and a correlation coefficient of 0.998 The results of the analysis of some authentic samples (Table and Fig 6) show ... best straight line slope of 2.56, an intercept of 28.54 and a correlation coefficient of 0.996 The results of the analysis of some authentic samples of hydrogen peroxide are shown in Table and in ... À 24.19), a slope of 4.91 and a correlation coefficient of 0.999 The analysis of some authentic samples of permanganate by this new method gave an average percentage recovery of 99.3% (Table and...

Ngày tải lên: 02/09/2015, 13:46

... while involvement of offending party positively affects crash severity National University of Singapore iv Table of contents TABLE OF CONTENTS ACKNOWLEDGEMENT i TABLE OF CONTENTS ... 52 National University of Singapore iii List Of Figures LIST OF FIGURES Figure 2.1: Mapping of latent variable to observed variable 13 Figure 2.2: A hierarchy of severity at level 1, within ... 4.2: Estimate of Deviance Information Criterion (DIC) 40 Table 4.3: Estimate of fixed part and random part 41 National University of Singapore vi List Of Illustrations LIST OF ILLUSTRATIONS...

Ngày tải lên: 29/09/2015, 13:01

... established methods of analysis of food components and additives The book comprises 16 chapters, which take the reader through brief and accessible descriptions of methods of analysis of food components ... different techniques for various purposes in food analysis The second chapter, “Statistical Assessment of Results of Food Analysis, ” provides an overview of the need for statistical assessment of the ... chlorophylls, food polyphenols, aroma compounds, food volatiles, sensory analysis of foods and determination of food allergens, genetically modified components, pesticide residues, pollutants in foods,...

Ngày tải lên: 02/12/2016, 12:54