Belonging to the family of pterins, which are common chromophores in several bio-organisms, xanthopterin has been shown experimentally (Plotkin et al., 2010) to have the ability of acting as a light-harvesting molecule. In the present study, multiconfigurational second-order perturbation theory ...

(R)-Ethyl 2-hydroxy-4-phenylbutyrate is an important intermediate for the synthesis of several ACE-inhibitors (ACE = angiotensin-converting enzyme). A possible preparation of this intermediate is the kinetic resolution of the racemic 2-hydroxy compound. The enantioselective hydrolysis is catalyz...

In the enantioselective hydrolysis of (R,S)-ethyl 2-hydroxy-4-phenylbutyrate ((R,S)-EHPB) in isooctane or in a biphasic solution, Lipase PS having an enantiomeric ratio (i.e. the E value) of 22 for the (S)-enantiomer was screened as the best lipase to produce the remaining (R)-ethyl 2-hydroxy-4-...

Herein, different microorganisms were tested in the enantioselective reduction of ethyl 2-oxo-4-phenylbutyrate in aqueous medium for the preparation of ethyl (R)-2-hydroxy-4-phenylbutyrate, a key intermediate in the production of angiotensin converting enzyme (ACE) inhibitors. The use of Pichia ...

Solid-state grinding, ultrasonic impregnation and conventional impregnation methods were adopted to synthesize mesoporous composites Al2O3@SBA-15 supported Pt catalysts for chiral hydrogenation of ethyl 2-oxo-4-phenylbutyrate after modified with cinchonidine. Compared with Pt/SBA-15 or Pt/alumin...

Ethyl (R)-2-hydroxy-4-phenylbutyrate ((R)-HPBE), a key intermediate in the production of angiotensin-converting enzyme (ACE) inhibitors, was prepared by the microbial reduction of ethyl 2-oxo-4-phenylbutyrate (OPBE). Among 63 microorganisms tested, Candida krusei SW2026, for the first time, was ...

Optically active ethyl (R)-2-hydroxy-4-phenylbutyrate [(R)-HPBE] is widely used as a key chiral building block in the synthesis of a class of angiotensin-converting enzyme (ACE) inhibitors. A highly enantioselective carbonyl reductase responsible for the reduction of ethyl 2-oxo-4-phenylbutyrate...

Recombinant strains of Pichia pastoris expressing carbonyl reductase CgKR2 from Candida glabrata were constructed for stereoselective reduction of ethyl-2-oxo-4-phenylbutyrate (OPBE) to ethyl (R)-2-hydroxy-4-phenylbutyrate [(R)-HPBE], an important building block for synthesis of angiotensin-conv...

Recombinant diketoreductase showed excellent stereoselectivity in the double reduction of β,δ-diketo esters. To investigate the substrate specificity and to broaden the applications of this new biocatalyst, a number of ketone substrates were used to evaluate the substrate spectrum and enantios...

A new biocatalytic strategy to obtain the ethyl (R)-2-hydroxy-4-oxo-4-phenylbutyrate precursor of ethyl (R)-2-hydroxy-4-phenylbutyrate, an important intermediate in the synthesis of a variety of ACE inhibitors, has been set up. Starting from ethyl 2,4-dioxo-4-phenylbutyrate, a screen of microorg...

Mesoporous carbon-silica composites supported Pt nanoparticle catalysts (Pt/MCS) were firstly applied to the heterogeneous asymmetric hydrogenation of ethyl 2-oxo-4-phenylbutyrate (EOPB). A series of different silica contents were investigated in the fabrication of this mesoporous material. When...

Among the wide variety of amylolytic enzymes synthesized by microorganisms, α-amylases are the most widely used biocatalysts in starch saccharification, baking industries and textile desizing. These enzymes randomly cleave the α-1,4-glycosidic linkages in starch, generating maltose and malto-o...

Lysophosphatidic acid (LPA) is the simplest form of lysophospholipid. Molecular species of LPA have been identified as the potent components in the ovarian cancer activation factor. The elevated plasma LPAs may be used as potential biomarkers for the early detection of ovarian cancer. This paper...

Secretory phospholipases A2 (sPLA2s) are present in snake venoms, serum, and biological fluids of patients with various inflammatory, autoimmune and allergic disorders. Lipid mediators in the inflammatory processes have potential value for controlling phospholipid metabolism through sPLA2 inhibi...

Purpose: We seek to compare lysophosphatidic acid (LPA) plasma levels (all subtypes) in patients with ovarian cancer and patients without this disease. Patients and Methods: Capillary electrophoresis with indirect ultraviolet detection was used to analyze the plasma LPA levels (with all subtypes...

Liver is the major organ where insulin performs its physiological function. In this study, lauric acid and oleic acid were respectively conjugated to quaternized chitosan, and the fatty acid modified chitosan derivatives were used as the carriers to deliver the loaded insulin to liver. The nanop...

Bi2S3/[email protected]2 composite photocatalyst was designed by a simple and safe microwave hydrothermal synthesis method. [email protected]2 enhance the catalytic performance of Bi2S3 by double-sided coordination as an electron hole inhibitor and a cocatalyst. The composite photocatalyst posse...

Methyl salicylate is available over-the-counter for topical use as an antiinflammatory and analgesic agent. Methyl salicylate is used externally because of its irritating effect on gastrointestinal mucosa. It can either be synthesized or extracted from the leaves of Gaultheria procumbens (Ericac...

A toxicologic and dermatologic review of methyl salicylate when used as a fragrance ingredient is presented.

Solvate structures of salicylic acid and its derivatives (acetylsalicylic acid, methyl salicylate, salicylamide, and sodium salicylate) in supercritical carbon dioxide modified by polar cosolvent (methanol, 0.03 mol fraction) at density of 0.7 g/cm3 and temperature of 318 K were studied by means...