John Price

Physicist, Prof Emeritus U Colorado, maker of NMR spectrometers, struggling flute player | #physics #NMR #chemistry #flute

[John Price @JPricePhysics]

According to the sweetness index, this spectrum is 180 times sweeter than a sucrose spectrum. #NMR #Chemistry #FoodScience #NMRchat

[Q Magnetics @QMagnetics]

Aspartame is a widely used low-calorie sweetener with a ¹H NMR spectrum that reflects its peptide-based structure and aromatic phenylalanine moiety. Distinct methine and methylene resonances arise from vicinal coupling and differing electronic environments within the backbone. With its industry-leading 125 MHz field strength, the QM-125 benchtop NMR provides well-resolved spectra suitable for routine characterization of compounds like aspartame.

#NMR #NMRchat #BenchtopNMR #QM125 #Aspartame #Lowcalorie #Sweetener #Peptide #Coupling #Chemistry #Organicchemistry #Analyticalchemistry

[John Price @JPricePhysics]

It’s a good day to post and repost this editorial on Trump’s rampage against US science:
https://t.co/SyUQL9yPF7

[John Price @JPricePhysics]

@washingtonpost Sad to see the American Diabetes Association cave in to fascist Trumpies. They’ll be trying hard to forget this episode in a few years.

[John Price @JPricePhysics]

@joshgerstein It’s the rule that says all organizations we used to trust will cave in to fascist Trumpies.

[Q Magnetics @QMagnetics]

125 MHz benchtop NMR highlights the clean alkene and aldehyde signals of trans-2-hexenal. Its conjugated structure shifts the aldehyde proton downfield while the trans alkene gives well separated vinyl resonances. Trans-2-hexenal is widely used in flavors and fragrances for its fresh, leafy aroma.

#NMR #NMRchat #BenchtopNMR #QM125 #NMRspectroscopy #Chemistry #Organicchemistry #Analyticalchemistry #Trans2hexenal #Alkene #Aldehyde #Conjugated #Trans #Vinyl #Flavor #Fragrance #Fragrancechemistry #Perfumery

[Q Magnetics @QMagnetics]

125 MHz benchtop NMR of 4-Nitrotoluene gives a simple, well resolved spectrum with two aromatic doublets from the para substituted ring and a sharp methyl singlet. The strong electron withdrawing nitro group shifts the aromatic signals downfield. 4-Nitrotoluene is used in the production of azo dyes, pigments,and agricultural chemicals.

#NMR #NMRchat #BenchtopNMR #QM125 #NMRspectroscopy #Chemistry #Organicchemistry #Analyticalchemistry #4Nitrotoluene #Nitrotoluene #Toluene #Para #Parasubstituted #Methyl #Electronwithdrawing #EWG #Nitro #Downfield #Azodyes #Pigments #Agriculture

[Q Magnetics @QMagnetics]

125 MHz benchtop ¹H NMR of isopropylbenzene. Used in the production of phenol and acetone, it also appears in fuels and industrial solvents. This type of analysis is useful in petrochemical and chemical manufacturing settings for monitoring feedstocks and product purity. Its monosubstituted benzene ring gives the characteristic aromatic multiplet pattern, while the isopropyl group produces well resolved benzylic and methyl resonances with clean coupling.

#NMR #NMRchat #BenchtopNMR #QM125 #NMRspectroscopy #Chemistry #Organicchemistry #Analyticalchemistry #Isopropylbenzene #Cumene #Phenol #Acetone #Fuel #Solvents #Industrial #Petrochemical #Petrochemistry #Chemicalmanufacturing #Feedstocks #Purity #Productpurity #Aromatic #Benzylic #Methyl #Coupling #Isopropyl

[Q Magnetics @QMagnetics]

125 MHz benchtop ¹H NMR of propylene carbonate. Used as a solvent in lithium-ion batteries and in cosmetics for pigment dispersion and stabilization. Its cyclic carbonate ring creates a rigid structure that reduces signal overlap. The electron-withdrawing group shifts methylene protons downfield, while the asymmetric environment gives a distinct methyl signal and clean splitting.

#NMR #NMRchat #BenchtopNMR #QM125 #NMRspectroscopy #Chemistry #Organicchemistry #Analyticalchemistry #Propylenecarbonate #Battery #Lithiumion #Pigmentation #Makeup #Cosmetics #Cosmeticchemistry #Carbonate #Methylene #Methyl #Resonance

[John Price @JPricePhysics]

@washingtonpost 🤮

[John Price @JPricePhysics]

@star_stufff Hard to believe. S-parameters and the S matrix have been a foundation of microwave engineering since the days of the rad lab. When is Wheeler supposed to have coined it?

[John Price @JPricePhysics]

#NMRchat

[NMR Relaxation Essay @MattiaNegr73732]

Added explanation of PGSTE and DFS, with pictures! https://t.co/12ANy0th8X #NMRchat #NMRrelaxation

[Q Magnetics @QMagnetics]

125 MHz ¹H NMR of 4-Hydroxypropiophenone showcases a well-resolved spectrum from a simple aromatic ketone. The para substituted ring gives two distinct doublets, the ethyl side chain adds aliphatic signals. It is a commonly used intermediate in pharmaceuticals and fragrance chemistry.

#NMR #NMRchat #BenchtopNMR #QM125 #NMRspectroscopy #Chemistry #Organicchemistry #Analyticalchemistry #4Hydroxypropiophenone #Ketone #Parasubstituted #Splitting #Intermediate #Pharmaceuticals #Fragrance #Fragrancechemistry #Perfumery

[Q Magnetics @QMagnetics]

From soft plastics to sharp spectra, diethyl phthalate (DEP) is well resolved on the QM 125 benchtop ¹H NMR. It is used as a plasticizer for PVC and cellulose acetate to improve flexibility and as a low-volatility solvent in fragrances and cosmetics. Its symmetric phthalate core leads to characteristic aromatic splitting patterns.

#NMR #NMRchat #BenchtopNMR #QM125 #NMRspectroscopy #Chemistry #Organicchemistry #Analyticalchemistry #Diethylphthalate #DEP #Plasticizer #Cellulose #PVC #Cosmetics #Cosmeticchemistry #Fragrance #Fragrancechemistry #Perfumery

[Mike Young @micyoung75]

Justice Ketanji Brown Jackson didn't invoke Weimar Germany as a rhetorical flourish. She cited a specific scholar by name in a footnote: Ernst Fraenkel, a Jewish labor lawyer who observed the Nazi legal system from the inside, smuggled his manuscript out of Berlin in 1938, and published "The Dual State" at the University of Chicago in 1941.

Fraenkel's framework is precise. The Nazis didn't immediately collapse Germany's legal system. They left courts functioning - particularly in contracts and economic matters - while placing Jews and political enemies in a separate lawless zone where no legal protection applied. Most Germans lived in the law-bound "normative state." The targeted lived in the "prerogative state." The facade of normalcy was the mechanism of control.

Jackson invoked Fraenkel to name what the court's Republican majority is doing in real time. In 21 consecutive shadow docket cases, the six conservative justices have let Trump opt out of the law - often with no explanation given at all. They blessed ICE racial profiling without citing a single legal justification. They allowed Trump to ignore $4 billion in congressionally appropriated foreign aid. They stripped lower courts of the ability to issue universal relief, meaning only those with resources to file individual lawsuits get protection from illegal presidential action.

Constitutional law professor Evan Bernick put it plainly: "The court is adjusting the law to make place for arbitrary power."

Jackson's dissent is not hyperbole. A footnote citing a 1941 manuscript about Nazi legal architecture is a Supreme Court justice blowing the cover on what her colleagues are building.

[Q Magnetics @QMagnetics]

125 MHz ¹H NMR of Brilliant Blue FCF reveals the spectral signature of one of the most recognizable food dyes. Its highly conjugated triarylmethane core produces a rich set of aromatic resonances, while sulfonated groups shape peak positions in aqueous solution. Widely used to give a vivid blue color to sports drinks, sodas, candy, frostings, and blue raspberry–flavored products.🧪

#NMR #NMRchat #BenchtopNMR #QM125 #NMRspectroscopy #Chemistry #Organicchemistry #Analyticalchemistry #Brilliantblue #Fooddye #Blue #Bluerasberry #Vivid #Foodscience

[John Price @JPricePhysics]

@curiouswavefn This is just the very last step that consolidated many many years of data generation, and for the first two also instrument development. AI is great at manipulating formal systems. Not a small achievement, but just a part of scientific discovery.

[John Price @JPricePhysics]

@yashiro_ld Interesting project!

[Q Magnetics @QMagnetics]

125 MHz ¹H NMR of caffeine. Beyond its stimulant role, caffeine contributes key bitterness and balance in beverages, making authentic caffeine-free flavor profiles difficult to replicate. Its substituted xanthine core yields three distinct N-methyl singlets and a characteristic aromatic proton, creating an easily recognized spectral fingerprint.

#NMR #NMRchat #BenchtopNMR #QM125 #NMRspectroscopy #Caffeine #Stimulant #Bitter #Coffee #Cola #Caffeinefree #Flavor #Xanthine #Aromatic #Chemistry #Organicchemistry #Analyticalchemistry #Foodscience

[John Price @JPricePhysics]

@InnaVishik No biologists, no medicine, no astrophysics, no chemistry

[John Price @JPricePhysics]

Thanks to everyone who stopped by. #ACSSpring2026 #SupportScience

[Q Magnetics @QMagnetics]

Last day at the @AmerChemSociety Spring 2026 expo! Stop by booth #1325 and chat with John! 🧪 🧲
#ACSSpring2026 #ACS #ACS150 #NMR #NMRchat #BenchtopNMR #QM125

[John Price @JPricePhysics]

@physorg_com Preprint: https://t.co/110mw1AMdx