| 单词 | furfural |
| 例句 | In fact, says Strlič, the smell is due to the release of chemicals such as furfural and hexanol as the paper itself decays. Can you judge a book by its odour? 2017-04-07T04:00:00Z The researchers made their ionic liquids using furfural, vanillin and p-anisaldehyde, which are aromatic aldehydes derived from lignin and cellulose. Recycled Biofuel Byproducts Could Make Biofuels Even Greener 2014-08-27T04:00:00Z Congeners include acetaldehyde itself as well as acetone, fusel oil, furfural, methanol's metabolites, polyphenols, histamines, esters, tannins, amines and amides, among others. In Search of a Cure for the Dreaded Hangover 2014-03-17T11:00:00Z Brandy also contains a certain quantity of free acid, which increases with age, furfural, which decreases, and small quantities of other matters of which we have as yet little knowledge. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 4 "Bradford, William" to "Brequigny, Louis" Of special interest, in its bearings on this point, is the direct transformation of levulose into furfural derivatives, which takes place under the action of condensing agents. Researches on Cellulose 1895-1900 If a book smells chocolatey, it’s likely that it is releasing vanillin, benzaldehyde and furfural – three chemicals associated with the degradation of the cellulose and lignin in paper. Can you judge a book by its odour? 2017-04-07T04:00:00Z The smoke of a single cigaret may contain as much furfural as two ounces of whisky. How to Live Rules for Healthful Living Based on Modern Science NOTE.—When cane or granulated sugar is caramelized, a small quantity of an injurious substance called furfural is formed. School and Home Cooking With high furfural numbers indicating that the furfuroids are the chief constituents of the extract, there is an active fermentation with production of alcohol. Researches on Cellulose 1895-1900 The actual production of furfural by boiling with condensing acids is a quantitative measure of only a portion, i.e. certain members of the group. Researches on Cellulose 1895-1900 Since the general result of these oxidations is the substitution of an OH group for an H atom, it was of interest to determine the behaviour of furfural with the peroxide. Researches on Cellulose 1895-1900 Following in this direction of development of the subject is a study of the action of persulphuric acid upon furfural. Researches on Cellulose 1895-1900 When caramelized sugar is boiled with water, however, the furfural is expelled. School and Home Cooking Lastly, this is the simplest transition yet disclosed from the succinyl to furfural grouping, being effected by a regulated proportion of oxygen, and under conditions of reaction which may be described as of the mildest. Researches on Cellulose 1895-1900 The latter result is evidenced by the formation of furfural, the former by the presence of soluble carbohydrates in the solution obtained by diluting the original solution and filtering from the reprecipitated cellulose. Researches on Cellulose 1895-1900 This process, requiring the presence of strong HCl, has the advantage of being applied directly to the acid distillate, in which form furfural is obtained as a product of condensation of pentoses, &c. Researches on Cellulose 1895-1900 This paper is the most complete investigation yet published of the now well-known method of precipitating and estimating furfural in acid solution by means of the trihydric phenol. Researches on Cellulose 1895-1900 Also, cane sugar yields more furfural than glucose,—the kind of sugar that is present in corn sirup. School and Home Cooking Thus even with a preparation containing 30 p.ct. of its weight of diresorcinol the influence of the latter is eliminated, provided a weight be taken equal to twice that of the furfural to be precipitated. Researches on Cellulose 1895-1900 It is usual to regard furfural as invariably produced from a pentose residue. Researches on Cellulose 1895-1900 The furfural constants of the lignocellulose are unaffected by the acetylation and condensation. Researches on Cellulose 1895-1900 The residues were found to yield considerable proportions of furfural. Researches on Cellulose 1895-1900 The distillates were collected in successive fractions, and the furfural and volatile acid determined. Researches on Cellulose 1895-1900 By secondary reactions they may yield some furfural, but as they are highly reactive compounds, and most readily condensed, they are for the most part converted into complex 'tarry' products. Researches on Cellulose 1895-1900 The author has also established a relation between the phenylhydrazine fixed and the furfural which the substance yields on boiling with condensing acids. Researches on Cellulose 1895-1900 Investigation of the products for yield of furfural, gave 9 p.ct. of this aldehyde showing the presence of celluloses, other than the normal type. Researches on Cellulose 1895-1900 They yield on boiling with condensing acids from 6 to 9 p.ct. furfural. Researches on Cellulose 1895-1900 But the most characteristic feature is the high yield of furfural on boiling with condensing acids. Researches on Cellulose 1895-1900 Of the author's experimental results the following may be cited as typical: Substance Yield of furfural p.ct. Researches on Cellulose 1895-1900 Yield of furfural was estimated on the whole plant and on the residue from a treatment with alkaline and acid solvents in the cold such as to remove all cell contents. Researches on Cellulose 1895-1900 The total furfural is rapidly formed, whereas the volatile acid continues to be formed long after the aldehyde ceases to come over. Researches on Cellulose 1895-1900 |
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