Specific Acceleration of the Hydrogenation of Methyl Acetoacetate on Enantio-Differentiating Sites of a Tartaric Acid-Modified Nickel Catalyst by the Addition of Acetic Acid to the Reaction Media

2005 ◽  
Vol 78 (7) ◽  
pp. 1371-1372 ◽  
Author(s):  
Tsutomu Osawa ◽  
Masashi Ando ◽  
Tadao Harada ◽  
Osamu Takayasu
Keyword(s):  
Acetic Acid ◽  
Tartaric Acid ◽  
Nickel Catalyst ◽  
Methyl Acetoacetate ◽  
Reaction Media

Highly Efficient Enantio-selective Hydrogenation of Methyl Acetoacetate over an Improved Tartaric Acid-modified Raney Nickel Catalyst

2006 ◽  
Vol 35 (8) ◽  
pp. 910-911 ◽  
Author(s):  
Hangning Chen ◽  
Rong Li ◽  
Huanling Wang ◽  
Liang Yin ◽  
Fushan Wang ◽  
...  
Keyword(s):  
Tartaric Acid ◽  
Nickel Catalyst ◽  
Raney Nickel ◽  
Selective Hydrogenation ◽  
Methyl Acetoacetate ◽  
Raney Nickel Catalyst ◽  
Highly Efficient

Bacterial Spoilage of Citrus Products at pH Lower than 3.51

1976 ◽  
Vol 39 (12) ◽  
pp. 819-822 ◽  
Author(s):  
B. J. JUVEN
Keyword(s):  
Acetic Acid ◽  
Lactic Acid ◽  
Thermal Resistance ◽  
Tartaric Acid ◽  
Lactobacillus Brevis ◽  
Acid Inhibition ◽  
Temperature Range ◽  
Ph Values ◽  
Sugar Syrup ◽  
Z Value

A strain of Lactobacillus brevis, L-3, was isolated from a blown can of grapefruit segments in sugar syrup; it caused spoilage of citrus products having pH values lower than 3.5. When inoculated into orange (pH 3.38) and grapefruit (pH 2.99) juices, after 5 h at 30 C L-3 produced 15 and 22 μg diacetyl/ml, respectively, and off-flavor was detectable. L-3 grew in APT broth acidified to pH 3.0 with citric, hydrochloric, phosphoric, or tartaric acid. However, its growth was inhibited at pH 3.6 if the acidulant was lactic acid, while with acetic acid inhibition occurred at a pH between 3.7 and 4.0. The thermal resistance of L-3 in orange serum (pH 3.4) was studied in the temperature range of 52 to 60 C: a z value of 8.3 was obtained. A simple and reliable capillary technique for studying the thermal resistance of gas-producing organisms in liquid foods and media is presented.

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