Isatin (CAS 91-56-5) and isatin-3-oxime (CAS 607-28-3) sit one synthetic step apart, and buyers regularly face the same question: make the oxime in-house from isatin, or buy the oxime and start one step further down. The answer depends less on the price difference between the two powders than on whether your site wants to handle

Isatin-3-oxime (CAS 607-28-3) is a small-volume intermediate that appears at a very specific point in synthetic routes: it is the activated, nitrogen-bearing form of isatin, and the shortest path to a 3-amino oxindole. Demand for it is project-driven – one campaign, one customer, one specification – which is why it is rarely stocked in bulk

Several coenzymes in this family are sold both as a powder and as an aqueous concentrate – typically an 85% NAD solution against a 98% powder, or a 75% NADP disodium solution against a 98% powder. Buyers often read the lower percentage as a discount. It is not. The two figures are on different bases,

Buying a commodity solvent and buying a coenzyme are different jobs. A coenzyme lot is a hygroscopic, oxidation-sensitive biochemical whose usable content depends on the assay method, whose water content quietly changes what you receive, and whose documentation is often the thing that decides whether it can enter your process at all. This article sets

NADH and NADPH are the two reducing coenzymes of the nicotinamide family, and on paper they look interchangeable: both carry a hydride, both absorb at 340 nm, both are sold as powders at similar assay levels. In practice they are not interchangeable at all, because enzymes recognise the phosphate group on the 2′ position of

NADH – reduced β-nicotinamide adenine dinucleotide, disodium salt, CAS 606-68-8 – is the reducing coenzyme in the largest group of routine clinical chemistry assays and one of the two workhorses of enzymatic reduction in industry. It is also one of the least forgiving materials in the catalogue: it oxidises in air, degrades in light and

NADP is sold as four different things under four different CAS numbers: the free acid (53-59-8), the monosodium salt (1184-16-3), the disodium salt (24292-60-2), and the reduced tetrasodium salt (2646-71-1). All four carry the same coenzyme activity per mole of NADP(H); what differs is how much sodium they bring into your reaction, how fast they

NAD (CAS 53-84-9) is quoted in three commercial forms: an 85% min aqueous solution, a 98% min biotransformation-grade powder and a 99% min food-grade powder. Buyers routinely compare those three numbers as if they were points on the same scale, and that is where money is lost. The three figures sit on different bases, the

The nicotinamide coenzyme family – NAD, NADH, NADP and NADPH – sits underneath a large share of industrial biocatalysis, in vitro diagnostic chemistry and, more recently, the NAD+ precursor trade. Buyers who come to this page usually have one of three questions: which oxidation state they need, which salt form dissolves and behaves correctly in