Is it possible to have multiplate spectrums instead of doblet in anomeric proton of Polyphenol glycosides?

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Could you recommend some articles on Urban Transportation System optimization and Innovation?

13 August 2024 2,595 3 View

Is there any cases algae not using the nutrient from the wastewater and grow normally?

I am working on microalgae cultivation using waste water. The initial concentration of nutrients were less but the microalgae has achieved biomass growth of 2 g/L. The final concentration of...

08 August 2024 4,812 2 View

1. If I can quantize the atom using this hyperbolic spiral and classical physics, could nature do the same?

If we map as a continuous motion an ionising electron (beginning its journey at n=1) in an H atom, a specific hyperbolic spiral appears (see animation). When we solve this spiral formula, we find...

07 August 2024 5,343 2 View

Articles on" Gender disparities i leatherwork education"?

Articles on" Gender disparities i leatherwork education"

07 August 2024 2,500 0 View

Why results of ROS flurescence are negative as there was no bacteria within?

Hello. I am working on ROS production of two systems: system A is cerium oxide and hydrogen peroxide, system B is cerium oxide nanoparticle, hydrogen peroxide and potassium bromide. I did some...

04 August 2024 5,974 3 View

What should I do with parameters that are not relate to my simulation in MyLake model?

I want to Estimate surface heat fluxes using MyLake, but I don't have all the initial values in model parameters section and other sections,is there a way?

04 August 2024 1,537 1 View

Why reactivity isn't increased with more empty spots in valence shell?

If from a geometric perspective the non-halogens, non-noble gases have more empty spots in their valence shell, and the filling/exiting of any of the empty spots in the shell constitutes a...

03 August 2024 4,787 2 View

Why is the molecule's orientation with an electric field affect polarizability?

Why is the molecule's orientation with an electric field affect polarizability? Electrons are diffuse enough to be independent with respect to orientation and effect of electric field on...

03 August 2024 7,843 1 View

Why don't d-orbitals split themselves, why does it take a ligand? why don't protons from ligand repel nucleus split d-orbitals?

why don't d-orbitals split themselves because of themselves without the presence of ligands? Electrons are indistinguishable. Why wouldn't it be more correct that protons from a ligand split the...

03 August 2024 3,589 3 View

Why doesn't chromium 2+ ion use all its d-orbitals to receive lone pairs from six waters in [Cr(H20)6)]3+?

I'm guessing it's because the ligand experiences too much electron repulsion or proton repulsion from the chromium to insert them close to the 3d-orbitals which are close to the metal nucleus. Is...

03 August 2024 1,370 1 View

Convergence of absorbency values to determine the total phenolic content of several solvents?

I used several solvents and measured the absorbency and determined the total phenolic content, but the results were similar after dropping them on the titration curve; What is the reason, please help

17 July 2024 5,151 5 View

How can I extract glycosides from mangrove leaf samples without an incubator that can reach temperatures above 60°C?

I want to extract glycosides from my mangrove leaf samples, but my laboratory lacks an incubator capable of reaching temperatures above 60°C. The paper I am following specifies a minimum...

13 July 2024 3,686 0 View

Why there are no peaks at downfield NMR of Cobalt and Nickel complexes?

I synthesized some paramagnetic cobalt and nickel complexes (expected to be Co(II) and Ni(II)) using a bidentate ligand - N of pyridine ring (aromatic) and O of P=O (aliphatic), and I obtained...

03 July 2024 3,410 4 View

Why does the antioxidant activity increase as the number of OH groups on the phenolic ring increases?

and Why do double bonds reduce it ?

13 June 2024 4,836 4 View

How to identify the class of phytochemicals or plant secondary metabolites after GC-MS analysis and NIST library identification?

I have performed GC-MS analysis of Phytochemicals from a medicinal plants and also identified compound using NIST library. After NIST identification, I have a list of compounds. I am constructing...

12 June 2024 235 4 View

Why do I have an increasing concentration for increasing dilutions on spectroscopy even though they should all be the same final concentration?

Hello. We have a sample with an unknown concentration of polyphenols. We're diluting the sample in order to perform the Folin Ciocalteau method. 0.2 grams sample / 4 mL 70% methanol and 30%...

10 June 2024 2,134 3 View

Please share the HNMR sample preparation procedure for isotopic labelling test to confirm source of N2 during ENRR to ammonia.?

During electrocatalytic nitrogen reduction to ammonia, we perform isotopic labelling test using HNMR to confirm source of ammonia.

29 May 2024 5,165 0 View

How to calculate the total phenolic contents (TPC) in plant extract sample?

How do I calculate the total polyphenol content in mg GAE/g. from the extract? Following is my data: Sample extract(stock): 0.01 gram in 1 ml Equation: y= 0.0078x - 0.0679, R2 =...

27 May 2024 1,911 2 View

Is there anyone that can assist be with removing excess 1-Iodo-Octane from from my product. Beside high vacuum distillation and kugelrohr what else?

I perform al alkylation reaction on an imdazole compound where the alkyl reagent (1-Iodo-Octane) was in excess. After the reaction was completed, I then performed an extraction, followed by...

24 May 2024 8,042 2 View

How can I differentiate the -NH group in the backbone and -NH2 group in the side chain of my poly(glutamine) polymer sample?

I have synthesized a poly(glutamine) sample and am currently analyzing it using NMR spectroscopy. I am facing challenges in differentiating the -NH protons from the backbone of the structure and...

12 May 2024 9,656 7 View