摘要:

AbstractThe isolation and properties of six new crystalline bitter principles, cucurbitacins F, G, I, J, K and L, and a method for their separation on formamide‐impregnated cellulose powder are describe

ISSN:0022-5142    

DOI:10.1002/jsfa.2740081202

出版商:John Wiley&Sons, Ltd    

年代:1957

数据来源: WILEY

摘要:

AbstractThe distribution of the twelve known cucurbitacins in 45 species, belonging to 18 genera, is reported. In certain species the cucurbitacins occur exclusively as glycosides. Variations of bitter principle content in different parts and with age and origin of a plant have been found. An association of cucurbitacin B with D, G and H, and of cucurbitacin E with I, J and K is indicated. The relation between bitter principle composition and taxonomic divisions is discussed.

ISSN:0022-5142    

DOI:10.1002/jsfa.2740081203

出版商:John Wiley&Sons, Ltd    

年代:1957

数据来源: WILEY

摘要:

AbstractThe bitter principle content of the seedlings of twenty‐one species and a large number of varieties of cucurbits has been investigated. The cucurbitacins B and E are the main bitter principles in all seedlings. The biogenesis of the cucurbitacins, the taxonomy of the family and the genetics of bitterness are discussed in the light of these result

ISSN:0022-5142    

DOI:10.1002/jsfa.2740081204

出版商:John Wiley&Sons, Ltd    

年代:1957

数据来源: WILEY

摘要:

AbstractDifferent varieties of cereals have been fumigated, at each of four moisture contents, with one of two doses of methyl bromide. The germination of the seeds was assessed immediately after the treatment and again after six months' storage at 20°. The damage done by the fumigant was distinguished from that associated with storage at high moisture contents by drying a part of each treated batch of seeds after fumigation and before storage.Barley was the cereal most resistant to fumigation, rye, maize, oats and wheat all being appreciably more susceptible. Rye was the most, and maize the least, resistant cereal in terms of survival after damp storage, but damp rye is severely affected by methyl bromide. Where different varieties of the same cereal species have been tested no important differences have been found

ISSN:0022-5142    

DOI:10.1002/jsfa.2740081205

出版商:John Wiley&Sons, Ltd    

年代:1957

数据来源: WILEY

摘要:

AbstractThe fat produced byPenicillium soppiiwhen grown in surface culture on a medium containing sucrose and mineral salts has a very low content of free acid (0.6% as oleic acid). The component acids of this fat have been found to be: myristic, 0.3; palmitic, 22.0; stearic, 7.6; arachidic, 0.9; hexadecenoic, 3.3; oleic, 45.2; linoleic, 20.0; linolenic, 0.3 eicosenoic, 0.4% (w/w). In its content of linoleic acid the fat resembles ground‐nut oi

ISSN:0022-5142    

DOI:10.1002/jsfa.2740081206

出版商:John Wiley&Sons, Ltd    

年代:1957

数据来源: WILEY

摘要:

AbstractElectrophoretic diagrams of the expressible fluids of cod muscle have been compared with those of extracts at low ionic strength. A new component has been observed in the expressible fluids and some of its properties examined. Its possible sites in the muscle structure and its bearing on the nature of expressible fluid are discussed.

ISSN:0022-5142    

DOI:10.1002/jsfa.2740081207

出版商:John Wiley&Sons, Ltd    

年代:1957

数据来源: WILEY

摘要:

Abstractγ‐Irradiation at doses as low as 3500 r. suppresses the sprouting of potatoes but it may also have harmful effects. After storage for 6 months or more, sweetening rendered the tubers unsuitable for crisp or chip production. After 15 months, a great accumulation of sugar and complete breakdown have been observed. Irradiation at 20,500 r. and over increased the initial rate of water loss and subsequent wilting. Irrespective of irradiation, there was an apparent direct correlation between the rate of water loss and the cumulative loss which had occurr

ISSN:0022-5142    

DOI:10.1002/jsfa.2740081208

出版商:John Wiley&Sons, Ltd    

年代:1957

数据来源: WILEY

摘要:

AbstractThe composition of the hemicellulose fractions of wholemeal and flours of about 70% extraction in terms of anhydro‐arabinose, xylose and uronic acid units has been investigated. It has been shown that the hemicelluloses, on distillation with hydrochloric acid, behave in the same manner as an equimolecular mixture of arabinose and xylose. Xylose is a suitable standard for the distillation process, and the ‘xylose equivalent’ of a wheat fraction multiplied by 0.97 is a quantitative measure of the hemicellulose present, provided this is not less than

ISSN:0022-5142    

DOI:10.1002/jsfa.2740081209

出版商:John Wiley&Sons, Ltd    

年代:1957

数据来源: WILEY

摘要:

AbstractStone fruit—plums, greengages and cherries—which contain β‐glucosidase corrode lacquered tinplate cans more rapidly if the heat process used is insufficient to inactivate the enzyme. Heat penetration measurements indicate that the stone offers no peculiar resistance to heat, but nevertheless canning processes which give adequate protection against microbiological spoilage may leave active β‐glucosidase, or even peroxidase, in the kernels of the stones. Such residual enzyme activity provides a ready explanation of the abnormally rapid corrosion of cans sometimes encountered in commercial canning. The storage life of fruit in plain cans appears to be unaffected by such

ISSN:0022-5142    

DOI:10.1002/jsfa.2740081210

出版商:John Wiley&Sons, Ltd    

年代:1957

数据来源: WILEY

摘要:

AbstractThe more abundant of the non‐nitrogenous non‐volatile organic acids in extracts of perennial rye‐grass are quinic, malic and citric. Succinic acid and others are present in small amount. An investigation of changes taking place during ensilage and other conservation processes is described, lactic acid and the volatile fatty acids being determined simultaneously. In silage there is rapid and complete disappearance of malic and citric acid; this is also noted to a lesser extent during wilting and drying whereas, in grass preserved with metabisulphite, there is loss of malic acid

ISSN:0022-5142    

DOI:10.1002/jsfa.2740081211

出版商:John Wiley&Sons, Ltd    

年代:1957

数据来源: WILEY