A clean enzymatic process for producing flavour esters by direct esterification in switchable ionic liquid/solid phases
摘要:
开发了一种清洁的生物催化方法,利用可切换的离子液体/固体相作为反应/分离介质来生产香味酯。研究了不同离子液体与香味乙酰酯(香叶醇乙酸酯、香茅醇乙酸酯、奈缬醇乙酸酯和异戊醇乙酸酯)混合物的相行为,在多个浓度下进行研究,结果发现所有情况下在50°C时均为完全均匀的液态介质,而在室温下则为固态系统。通过在控制温度下对固体离子液体/香味酯混合物采用迭代离心分离协议,可以轻松分离出固态离子液体相和液态香味酯相。已证明,在N,N′,N′′,N′′′-十六烷基三甲基铵双(全氟甲基磺酰)亚胺([C16tma][NTf2])离子液体中,固定化的南极酵母脂肪酶B(Novozym 435)催化剂在脂肪族羧酸(醋酸、丙酸、丁酸或戊酸)与香味醇(异戊醇、香叶醇、香茅醇或香茅醇)之间的酯化反应中极为适合,在适当的反应条件(酶量、脱水分子筛等)下,产率提高至100%。通过这种方法在[C16tma][NTf2]中合成了十六种不同的香味酯,离子液体分离后产品浓度达到0.757 g mL−1。在七个连续操作周期中,酶/离子液体系统的残余活性在重复使用后几乎没有变化。
FLAVOR MODULATOR HAVING PYRIDINE DERIVATIVE OR SALT THEREOF AS ACTIVE INGREDIENT
申请人:T. HASEGAWA CO., LTD.
公开号:US20180072670A1
公开(公告)日:2018-03-15
2-(phenylalkyloxyalkyl)pyridine derivative or a 2-(phenylalkylthioalkyl)pyridine derivative imparts, when added to food and drink or cosmetics as an active ingredient, a flavor of natural impression thereto; and in particular, when added to food and drink, the compound imparts an umami imparting or enhancing, a saltiness enhancing a sweetness enhancing, and in particular, when added to a milk or dairy product, a food or drink product containing a milk or dairy product, or a dairy replacement product, the compound provides a milk richness enhancing.
[EN] PROCESSES FOR PRODUCING CARBOXYLIC ACIDS<br/>[FR] PROCÉDÉS DE PRODUCTION D'ACIDES CARBOXYLIQUES
申请人:EASTMAN CHEM CO
公开号:WO2020205348A1
公开(公告)日:2020-10-08
Processes are disclosed for preparing carboxylic acids from organic esters, the processes comprising contacting an ester with water in the presence of an acid catalyst and a homogenizing solvent at conditions effective to form a carboxylic acid. The homogenizing solvent is present in an amount sufficient to form a single-phase reaction mixture comprising the ester, water, and homogenizing solvent. The homogenizing solvent may be selected from acetonitrile, dimethyl sulfoxide, and 1,4-dioxane.
A new catalytic transesterification promoted by a tetranuclear zinc cluster was developed. The mild reaction conditions enabled the reactions of various functionalized substrates to proceed in good to high yield. A large-scale reaction under solvent-free conditions proceeded with a low E-factor value (0.66), indicating the high environmental and economical advantage of the present catalysis.
Highly efficient transformation of γ-valerolactone to valerate esters over structure-controlled copper/zirconia catalysts prepared via a reduction-oxidation route
作者:Shanshan Liu、Guoli Fan、Lan Yang、Feng Li
DOI:10.1016/j.apcata.2017.06.032
日期:2017.8
synthesis of highly dispersed Cu/ZrO2 catalyst. Characterization results revealed that homogeneous dispersion of CuO, high surface area of ZrO2 support with controlled porous structure, and strong interaction between CuO and ZrO2 in CuO/ZrO2 precursor could lead to the enhanced Cu dispersion and the formation of Cu+ activecenters. The synthesized Cu/ZrO2 catalysts exhibited excellent catalytic performance
[EN] NEW PYRAZOLE DERIVATIVES AS ANGIOTENSIN II ANTAGONIST<br/>[FR] NOUVEAUX DERIVES DE PYRAZOLE UTILISES COMME ANTAGONISTES DE L'ANGIOTENSINE II
申请人:J. URIACH & CIA, S.A.
公开号:WO1996004273A1
公开(公告)日:1996-02-15
(EN) Compounds of general formula (I) and their salts and solvates are angiotensin II receptor antagonists and as such are useful in the treatment of hypertension, congestive heat failure and elevated intraocular pressure. Pharmaceutical compositions including these compounds and processes for their preparation are also provided.(FR) Les composés de formule générale (I) (ainsi que leurs sels et solvates) sont des antagonistes du récepteur de l'angiotensine II et à ce titre sont utiles dans le traitement de l'hypertension, de l'insuffisance cardiaque congestive et de l'hypertension intra-oculaire. Des compositions pharmaceutiques renfermant ces composés et des procédés pour leur préparation sont également décrits.
(中文) 通式 (I) 及其盐和溶剂化合物是血管紧张素 II 受体拮抗剂,因此在治疗高血压、充血性心力衰竭和眼内压升高方面非常有用。还提供了包括这些化合物的药物组合物和其制备方法。