摘要:

AbstractThe maturation period of Zagloul dates, representing the red‐type of fresh dates, was classified into four stages: ‘green’, ‘turning’, ‘fully coloured’ and ‘discoloured’ instead of the three stages designated by the Mesopotamian native terms of ‘Kimri’, ‘Khalal’, and ‘Rutab’. Analyses of dates during the maturation period are presented, from which it is seen that total sugars increased up to the ‘full coloured’ (edible) stage and thereafter decreased. Changes in the other c

ISSN:0022-5142    

DOI:10.1002/jsfa.2740071001

出版商:John Wiley&Sons, Ltd    

年代:1956

数据来源: WILEY

摘要:

AbstractEnzymic hydrolysates have been prepared from α‐, β‐ and γ‐fractions of the casein complex by use of trypsin, and from commercial muriatic casein by use of crystalline trypsin and of crystalline chymotrypsin. These hydrolysates had a bitter taste.Muriatic casein was incubated with dilute sodium hydroxide so as to split off orthophosphate before digestion with ‘Protease’ (Takamine). Muriatic casein was also treated with crude proteolytic enzyme preparations and the degree of liberation of orthophosphate was measured. In these experiments the taste of the hydrolysates was improved in parallel with the liberation of orthophosphate. However, a similar improvement in taste was not observed when the orthophosphate was removed by use of intestinal phosphatase following the tryptic hydrolysis.A series of fractionations of a tryptic casein hydrolysate yielded a product that had an extremely bitter taste. Chromatographic and electrophoretic studies have suggested that this material was a single polypeptide. Use of 2: 4‐dinitrofluorobenzene failed to reveal the presence of N‐terminal amino‐acids; the material yielded leucine, valine, and glutamic acid on hydrolysis wit

ISSN:0022-5142    

DOI:10.1002/jsfa.2740071002

出版商:John Wiley&Sons, Ltd    

年代:1956

数据来源: WILEY

摘要:

AbstractThe flavonols quercetin‐3‐glucoside (isoquercitrin), kaempferol‐3‐glucoside (astragalin), quercetin‐3‐rhamnoglucoside (rutin), kaempferol‐3‐rhamnoglucoside, quercetin‐3‐rhamno‐diglucoside, and kaempferol‐3‐rhamnodiglucoside, previously isolated and characterized in Japanese green teas, have also been detected in unprocessed tea‐leaf and black tea from North East India. From the latter sources two glycosides of myricetin, tentatively identified as the 3‐glucoside and 3‐rhamnoglu

ISSN:0022-5142    

DOI:10.1002/jsfa.2740071003

出版商:John Wiley&Sons, Ltd    

年代:1956

数据来源: WILEY

摘要:

AbstractAn investigation has been made of elaterase, a relatively specific enzyme for the hydrolysis of bitter principle glycosides of the Cucurbitaceae. A comparative study covering 33 different species showed that this enzyme is widely spread in this family. Elaterase was isolated from the fruit juice ofEcballium elaterium, Cucumis myriocarpusandLagenaria sicerariaand was examined in the ultracentrifuge. The effects of pH, temperature, time and enzyme concentration on the rate of hydrolysis of elaterinide, the monoglucoside of elaterin, have been investigated. In addition, the action of elaterase on various other glycosides was determined.

ISSN:0022-5142    

DOI:10.1002/jsfa.2740071004

出版商:John Wiley&Sons, Ltd    

年代:1956

数据来源: WILEY

摘要:

AbstractSome of the factors influencing the tenacity of spray deposits of cuprous oxide, cupric oxide, copper carbonate, copper oxychloride, Bordeaux and Burgundy mixtures have been investigated. Variation in the period of drying of the initial deposits, in the intensity of washing and in the temperature (up to 45°) had little effect on tenacity on artificial surfaces. Tenacity values were found to vary with the level but not with the type of distribution of the deposit. Except for Bordeaux, the tenacities of the copper fungicides increased with decreasing initial deposit and this effect is briefly discussed in terms of the relative importance of particle‐particle cohesion and particle‐surface adhesion. The tenacities of cupric oxide and copper oxychloride increased with decreasing particle size, but cuprous oxide and copper carbonate did not show this effect. The fungitoxicities of different size fractions of cupric oxide, determined againstAlternaria tenuis, did not increase with decreasing particle sizes below 6 μ, suggesting that a saturation value of the surface had been reached. The physico‐chemical forces which determine the tenacity of a spray deposit, in the absence of supplements, are briefly discussed.The relative importance of wind and rain in the weathering of deposits was determined in a field experiment. Although rain was the more important weathering agent, the effect of wind was considerable and seemed to be more pr

ISSN:0022-5142    

DOI:10.1002/jsfa.2740071005

出版商:John Wiley&Sons, Ltd    

年代:1956

数据来源: WILEY

摘要:

AbstractMeasurements have been made of the rate of absorption of oxygen from air, at 25°, by suspensions of flour in a phosphate buffer solution (pH 6.5). The effects of storage in air and nitrogen have been examined

ISSN:0022-5142    

DOI:10.1002/jsfa.2740071006

出版商:John Wiley&Sons, Ltd    

年代:1956

数据来源: WILEY

摘要:

AbstractBadami (Alphonso) mangoes were dipped in 1.7–2.7% aqueous emulsions of a fungicidal wax containing 5% of o‐phenylphenol*and after drying in a current of hot air the fruit was stored at 79–86° F and R.H. 55–87%. The treatment was found to lessen the physiological losses in weight, increase the retentions of vitamin C and moisture, delay ripening, decrease the percentage wastage and increase the storage life of t

ISSN:0022-5142    

DOI:10.1002/jsfa.2740071007

出版商:John Wiley&Sons, Ltd    

年代:1956

数据来源: WILEY