Optimized synthesis of (Z)-3-hexen-1-yl caproate using germinated rapeseed lipase in organic solvent
摘要:
(Z)-3-hexen-1-y1 esters are important green top-note components of food flavors and fragrances Effects of various process conditions on (2)-3-hexen-1-y1 caproate synthesis employing germinated rapeseed lipase acetone powder in organic solvent were investigated Rapeseed lipase catalyzed ester formation more efficiently with non-polar compared to polar solvents despite high enzyme stability in both types of solvents Maximum ester yield (90%) was obtained when 0 125 M (Z)-3-hexen-1-ol and caproic acid were reacted at 25 degrees C for 48 h in the presence of 50 g/L enzyme in heptane Enzyme showed little sensitivity towards a(w), with optimum yield at 045, while added water did not affect esteryield Esterification reduced by increasing molecular sieves (>0 0125% w/v) The highest yields of caproic acid were obtained with isoamyl alcohol (93%) followed by butanol and (Z)-3-hexen-1-01 (88%) respectively reflecting the enzyme specificity for straight and branched chain alcohols Secondary alcohols showed low reactivity while tertiary alcohol had either very low reactivity or not esterified at all A good relationship has been found between ester synthesis and the solvent polarity (log P value) while no correlation for the effect of solvents on residual enzyme activity was observed It may be concluded that germinated rapeseed lipase is a promising biocatalyst for the synthesis of valuable green flavor note compound The enzyme also showed a wide range of temperature stability (5-50 degrees C) (c) 2010 Elsevier B V All rights reserved
[EN] SUBSTITUTED PYRIDONES AS INHIBITORS OF POLY(ADP-RIBOSE) POLYMERASE (PARP)<br/>[FR] PYRIDONES SUBSTITUES INHIBITEURS DE LA POLY(ADP-RIBOSE) POLYMERASE (PARP)
申请人:AVENTIS PHARMA INC
公开号:WO2005097750A1
公开(公告)日:2005-10-20
The present invention discloses and claims a series of 2,3,5-substituted pyridone derivatives as defined herein. This invention also relates to methods of making these compounds. The compounds of this invention are inhibitors of poly(adenosine 5'-diphosphate ribose) polymerase (PARP) and are therefore useful as pharmaceutical agents, especially in the treatment and/or prevention of a variety of diseases, including diseases associated with the central nervous system and cardiovascular disorders.
Disclosed is a thermochromic microencapsulated pigment which comprises as four essential components (a) an electron-donating chromatic organic compound, (b) an electron-accepting compound, (c) a reaction medium determining the temperatures at which the color reactions of component (a) with component (b) take place, and (d) a color change temperature regulator, the color change temperature regulator (d) comprising one or more compounds selected from the group consisting of esters, alcohols, ketones, acid amides, hydrocarbons, and fatty acids and having a melting point Y (°C) satisfying the relationship (X+30)°C≤Y≤200°C, wherein X (°C) is the melting point of component (c), and the four essential components being microencapsulated.
A thermally color-developing reversibly thermochromic pigment which shows a uniform color density in the coloring temperature range and also shows an optional ΔH value within a range of from 3 to 40°C of the ΔH value (hysteresis temperature range) in a temperature-color density curve. Thermally color-developing reversibly thermochromic pigments of a three component system having a ΔH value of within a range of from 7 to 40°C in which at least essential three components including (a) an electron-donating chromic organic compound, (b) a specified compound selected from gallic acid esters and (c) a reaction medium selected from alcohols, esters, ketones and hydrocarbons, which reversibly generates color reactions of both of the compounds within a specified temperature range and has a melting point of less than 50°C, are microencapsulated, and of a four component system having a ΔH value of within a range of from 3 to 25°C in which a compound (d) selected from monomer compounds having a melting point of 50°C or more or polymer compounds having a softening point of 70°C or more is added to the three component system.
REVERSIBLY THERMOCHROMIC COMPOSITION, AND REVERSIBLY THERMOCHROMIC MICROCAPSULE PIGMENT HAVING SAME ENCLOSED THEREIN
申请人:The Pilot Ink Co., Ltd
公开号:EP3608386A1
公开(公告)日:2020-02-12
[Problems]
The present invention provides a highly marketable reversibly color changeable composition which provides a vivid yellow to orange color during color development, turns colorless during decoloration, and improves light resistance and a reversibly thermochromic microcapsule pigment encapsulating the same.
[Solution]
Disclosed are a reversibly thermochromic composition including: (a) a specific pyridine derivative as an electron-donating color-developing organic compound; (b) an electron-accepting compound; and (c) a reaction medium which reversibly induces an electron transfer reaction between the component (a) and the component (b) in a specific temperature range, and a reversibly thermochromic microcapsule pigment encapsulating the same.
REVERSIBLE THERMOCHROMIC COMPOSITION, REVERSIBLE THERMOCHROMIC MICROCAPSULE PIGMENT COMPRISING SAME, AND WRITING INSTRUMENT USING SAME
申请人:THE PILOT INK CO., LTD.
公开号:EP3950068A1
公开(公告)日:2022-02-09
[Problems] Provided are a highly marketable reversibly thermochromic composition that provides a black color during color development by using a fluoran derivative having a specific structure as an electron-donating color-developing organic compound, turns colorless during decoloration, and is excellent in contrast between a colored state and a decolored state and a microcapsule pigment encapsulating the same.
[Solution] Disclosed are a reversibly thermochromic composition including: (a) a fluoran derivative having a specific structure as an electron-donating color-developing organic compound; (b) an electron-accepting compound; and (c) a reaction medium which reversibly induces an electron transfer reaction between the component (a) and the component (b) in a specific temperature range, and a reversibly thermochromic microcapsule pigment encapsulating the same.