Zeatin is a cytokinin derived from adenine, which occurs in the form of a cis- and a trans-isomer and conjugates. Zeatin was discovered in immature corn kernels from the genus Zea. It promotes growth of lateral buds and when sprayed on meristems stimulate + some more technical info including receptor-mediated activation of the two-component cytokinin signaling pathway, interaction with histidine kinase receptors (for example AHK/CRE1 family), induction of type-B response regulator transcription factors and downstream cell cycle genes such as cyclin D to promote cell division and shoot organogenesis. Trans-zeatin, the biologically more active isomer, participates in vascular differentiation, delays leaf senescence, and alters source sink relationships by modulating nutrient mobilization and gene expression. Typical physicochemical properties relevant to formulation and handling are molecular formula C10H13N5O, molar mass 219.25 g/mol, crystalline solid appearance, limited aqueous solubility but good solubility in polar organic solvents such as methanol and dimethyl sulfoxide, and light and thermal sensitivity that recommend storage cold and protected from light. Standard analytical controls use reversed phase HPLC with UV detection and LC-MS confirmation for identity and assay.
Commercial trans-zeatin material is typically specified by HPLC assay at not less than 98.0 percent area percent or mass percent, with a related substances specification to control isomeric and biosynthetic congeners; typical limits are cis-zeatin not more than 1.0 to 2.0 percent, zeatin riboside (nucleoside) not more than 0.5 to 1.0 percent, zeatin-O-glucoside and other O-conjugates each not more than 0.5 to 1.0 percent, isopentenyladenine and other minor cytokinins combined not more than 0.1 to 0.5 percent, and basic adenine or adenosine impurities typically kept below 0.1 percent. Residual solvents are controlled per ICH Q3C and typically conform to Class 2 and Class 3 limits, and elemental impurities are limited to pharmacopeial or customer-specific ppm levels. Identity is confirmed by retention time matching and MS or NMR, and stability-indicating methods are used to monitor degradation products formed under stress conditions such as oxidation, hydrolysis and isomerization.
Yes. Zeatin occurs naturally in many higher plants as a free base and as glycosylated conjugates, and both cis and trans isomers have been isolated from plant tissues.
Zeatin is used as a research reagent to study cytokinin signaling, plant tissue culture and organogenesis, to promote shoot proliferation and to delay senescence in experimental systems. In applied horticulture and laboratory propagation it is employed at controlled concentrations to stimulate cell division and lateral bud outgrowth.
Coconut milk can contain natural cytokinins, including zeatin and zeatin-type compounds, but concentrations vary with source and processing. Detection in a given sample should be confirmed by analytical methods such as LC-MS.
Kinetin is a synthetic or naturally occurring purine derivative with a furfuryl side chain at N6, whereas zeatin is an N6-prenylated adenine derivative with an isoprenoid side chain; they differ in side chain chemistry, receptor affinity and biological potency, with zeatin generally showing higher activity in many plant systems and kinetin often used as a reference cytokinin in research.
