Strong Acid-promoted Skeletal Remodeling of the Aphid Pigment: Red Uroleuconaphin to Green Viridaphin

2022 ◽  
Author(s):  
Chiharu Ozakai ◽  
Kei Kitamura ◽  
Mitsuyo Horikawa ◽  
To-sho Hoshiyama ◽  
Akari Imamura ◽  
...  
Keyword(s):  
Aqueous Media ◽  
Strong Acid ◽  
Single Step

We present herein a strong acid-promoted single-step transformation of red uroleuconaphin A1 into green viridaphin A2. Viridaphin A1 and bis-naphthoquinone were also obtained by performing the reaction in aqueous media....

scholarly journals Biosensing Membrane Base on Ferulic Acid and Glucose Oxidase for an Amperometric Glucose Biosensor

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3757
Author(s):  
Gabriela Valdés-Ramírez ◽  
Laura Galicia
Keyword(s):  
Ferulic Acid ◽  
Glucose Oxidase ◽  
Aqueous Media ◽  
Glucose Biosensor ◽  
Single Step ◽  
Coefficient Of Determination ◽  
The Novel ◽  
Carbon Paste ◽  
Glucose Response ◽  
Glucose Biosensors

A biosensing membrane base on ferulic acid and glucose oxidase is synthesized onto a carbon paste electrode by electropolymerization via cyclic voltammetry in aqueous media at neutral pH at a single step. The developed biosensors exhibit a linear response from 0.082 to 34 mM glucose concentration, with a coefficient of determination R2 equal to 0.997. The biosensors display a sensitivity of 1.1 μAmM−1 cm−2, a detection limit of 0.025 mM, and 0.082 mM as glucose quantification limit. The studies reveal stable, repeatable, and reproducible biosensors response. The results indicate that the novel poly-ferulic acid membrane synthesized by electropolymerization is a promising method for glucose oxidase immobilization towards the development of glucose biosensors. The developed glucose biosensors exhibit a broader linear glucose response than other polymer-based glucose biosensors.

scholarly journals A rapid and simple method for the purification of transglutaminase from Streptoverticillium mobaraense.

1994 ◽  
Vol 299 (3) ◽  
pp. 825-829 ◽  
Author(s):  
U Gerber ◽  
U Jucknischke ◽  
S Putzien ◽  
H L Fuchsbauer
Keyword(s):  
Ion Exchange ◽  
Storage Stability ◽  
Culture Fluid ◽  
Strong Acid ◽  
Weak Acid ◽  
Ion Exchange Chromatography ◽  
Exchange Chromatography ◽  
Single Step ◽  
Simple Method ◽  
High Yields

Transglutaminase from Streptoverticillium mobaraense was partially purified by ion-exchange chromatography on a weak acid material and hydrophobic chromatography. The separation with a strong acid ion-exchanger produces homogeneous transglutaminase, in a single step and with high yields, directly from the centrifuged and filtered culture fluid of the micro-organism. The procedure reproduced several times could be also carried out on a larger scale with the optimized parameters of the laboratory isolations. The purified enzyme demonstrated good storage stability.

Zinc(II)-Catalyzed Synthesis of Secondary Amides from Ketones via Beckmann Rearrangement Using Hydroxylamine-O-sulfonic Acid in Aqueous Media

Synthesis ◽  
2020 ◽  
Vol 52 (21) ◽  
pp. 3272-3276
Author(s):  
Jawahar L. Jat ◽  
Saumya Verma ◽  
Puneet Kumar ◽  
Anil K. Khatana ◽  
Dinesh Chandra ◽  
...  
Keyword(s):  
Nitrogen Source ◽  
Sulfonic Acid ◽  
Direct Method ◽  
Aqueous Media ◽  
Single Step ◽  
Beckmann Rearrangement ◽  
Pure Form ◽  
Environmentally Benign ◽  
Open Atmosphere ◽  
Secondary Amides

A zinc(II)-catalyzed single-step protocol for the Beckmann rearrangement using hydroxylamine-O-sulfonic acid (HOSA) as the nitrogen source in water was developed. This direct method efficiently produces secondary amides under open atmosphere in a pure form after basic aqueous workup. It is environmentally benign and operationally simple.

Pd(ii) pincer type complex catalyzed tandem C–H and N–H activation of acetanilide in aqueous media: a concise access to functionalized carbazoles in a single step

2016 ◽  
Vol 18 (11) ◽  
pp. 3295-3301 ◽  
Author(s):  
Vignesh Arumugam ◽  
Werner Kaminsky ◽  
Dharmaraj Nallasamy
Keyword(s):  
Aqueous Media ◽  
Single Step ◽  
One Pot ◽  
One Pot Synthesis ◽  
Type Complex

NNO Pincer type Pd(ii) complex catalyzed one-pot synthesis of N-acetylcarbazoles in aqueous media is presented.

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