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  • 1960-1964  (7)
  • 1935-1939  (4)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Industrial and engineering chemistry 8 (1936), S. 209-210 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 25 (1960), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 25 (1960), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 4 (1939), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Calcium Zeo-Karb (zeolite) will effectively remove lead from maple sap even when the lead concentration is as much as 36 p.p.m. in terms of syrup. This base-exchange action of the calcium of the Calcium Zeo-Karb and the lead in the maple sap are independent of the temperature in the range between 5 and 60°C.(41 and 140°F.), but it is dependent upon the contact time (rate of percolation of the sap through the zeolite). When a contact time of one minute was used, the lead concentration was effectively reduced from 36 p.p.m. to less than one p.p.m.The present study has been limited to the removal of lead from maple sap by means of a base-exchange material; however, the authors are continuing this work and are now conducting experiments on the removal of zinc, copper, iron, and tin from maple sap with this material.During the 1939 maple-sugar season a calcium Zeo-Karb treatment plant will be set up and used in a sugar bush to ascertain its value under actual operating conditions.This paper is written before the completion of the work on the removal of the other heavy metals from maple sap, since the question of lead in maple products is very keen at the present time and the authors feel that this paper may be of some value to other workers.The use of this base-exchange material would be extremely simple. It would only need to be assembled in the pipe line leading from the maple-sap storage tank to the evaporator. It should require no attention whatever except to recharge it with calcium chloride at the beginning of each sugar season. The Zeo-Karb, if kept clean and washed well after each season's use, should last indefinitely.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 3 (1938), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The chief sources of lead in maple syrup are (1) lead paint which has been used to paint maple-producing equipment and chiefly sap buckets; (2) lead tin alloy used as a coating over some iron sap buckets, spouts, evaporators, and storage tanks; (3) lead-tin solder used in making water-tight joints in the above-mentioned equipment. Lead is dissolved by the sap, under the right conditions of temperature and acidity, when it is in contact with these lead-bearing materials.The syrup can be produced lead-free by modifying the equipment so as to eliminate lead-bearing materials or by painting with a lead-free paint.If the lead has been allowed to dissolve in the syrup, it can be removed as a phosphate, a method which is practical only in plants handling large amounts of syrup. The smaller producer may delead (clarify) his syrup by the addition of ten per cent or more by weight of skimmed or whole milk, heating, and subsequent nitration.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 25 (1960), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 28 (1963), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The growth of Pseudonmonas geniculata in sterile maple sap in the presence and absence of 5 ppm formaldehyde at several temperatures was investigated. At 27°C, the growth of inocula as low as 103 cells/ml was rapid, and the effect of formaldehyde, if any, was negligible. At 7°C, the temperature slowed the growth of the bacteria, particularly in cultures inoculated with 103 or 104 cells/ml. Formaldehyde further inhibited the cultures, initially causing a decrease in the number of viable organisms and lengthening the lag period before growth began again. This was particularly noticeable in the cultures with the smaller inocula.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 28 (1963), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The gritty material obtained by filtering commercial maple sirup was analyzed to determine its composition and to relate its composition to the amount of sugar sand deposited to determine the factors responsible for the formation of sugar sand. The samples, taken over a two-year period, contained calcium, malic acid, and undetermined material (probably silica) as the major constituents. The calcium, malic acid, and calcium malate content gave highly significant positive correlations with the amount of sugar sand formed, whereas the percentage of undetermined material gave a negative correlation. There was also evidence that the malic acid content was more critical in the formation of sugar sand than the calcium content. Highly significant negative correlations were obtained between the percent sugar sand deposited and the iron, copper, and boron content. Further, these constituents also gave highly significant negative correlations when compared with the calcium content of the sugar sand. The presence of potassium, magnesium, and molybdenum appeared to have little effect on the formation of sugar sand. The nonvolatile organic acids present in sugar sand were determined by paper chromatography. Results showed that sugar sand contains malic, citric, succinic, fumaric, and three unidentified organic acids.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 26 (1961), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The colorant of maple sirup has been isolated using ion exchange resins and purified by dialysis. The purified pigment had an empirical formula of C18H27O12N.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 26 (1961), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A major portion of the flavor was isolated from maple sirup by extraction with chloroform. From this was separated several pure crystalline compounds and several impure materials. Vanillin and syringaldehyde were definitely identified. These are compounds that could come from precursors in the decomposition of lignin, and this possible source of maple flavor is being investigated.
    Type of Medium: Electronic Resource
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