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Description
Galactinol (TCI G0298, CAS 3687-64-7) is a naturally occurring disaccharide composed of a single galactose unit linked to myo-inositol. The compound occupies a central position in plant biochemistry because it acts as the galactosyl donor in the biosynthesis of the raffinose family oligosaccharides — namely raffinose, stachyose, and verbascose. Its formation is catalysed by the enzyme galactinol synthase, and its concentration in plant tissue is frequently associated with responses to environmental stress. In the laboratory, galactinol is used as a substrate, an analytical standard, and a reference material in research on plant carbohydrate metabolism.
The property that makes this compound valuable is its position as a specific metabolic branch point: galactinol alone serves as the galactosyl donor in the raffinose oligosaccharide pathway, so its presence functions as a clear and unambiguous pathway marker. Its chemical structure is well defined under a single CAS number, which makes it straightforward to trace in the literature and to apply as a calibration standard in chromatography. Its water-soluble character further simplifies the preparation of solutions for both enzymatic assays and instrumental analysis.
In Indonesian laboratories, galactinol is typically used within plant physiology, agricultural biotechnology, and food science research groups, where studies of carbohydrate metabolism and stress response in crop species are common. University and institutional laboratories draw on it as a reference compound when profiling soluble sugars in plant extracts, while enzyme laboratories use it as the defined substrate in galactosyltransferase work. The 100 mg and 1 g pack sizes correspond to these working requirements.
Laboratory Applications
Galactosyl donor in enzymatic assays — as the sole donor in the raffinose family oligosaccharide pathway, it gives reaction mixtures a chemically defined and unambiguous substrate for galactosyltransferase activity measurements.
Analytical standard in chromatography — its well-defined structure under a single CAS number makes it suitable as a calibration reference for identifying and quantifying galactinol peaks in plant extract separations.
Plant carbohydrate metabolism research — because it sits at a specific metabolic branch point, it allows researchers to trace flux into raffinose, stachyose, and verbascose with clear pathway attribution.
Galactinol synthase studies — as the direct product of this enzyme, it serves as the authentic reference material for confirming enzyme activity and validating reaction products in biosynthesis experiments.
Plant stress response investigations — since tissue galactinol content is associated with responses to environmental stress, the pure compound supports quantitative comparison against biological samples under varied conditions.
Specifications
Brand: TCI
CAS number: 3687-64-7
Category: Chemistry > Chemical Biology > Glycoscience
Chemical class: naturally occurring disaccharide of galactose linked to myo-inositol
Pack sizes: 100 mg and 1 g
Solubility: soluble in water
Storage: follow the storage conditions stated on the manufacturer's label and accompanying documentation
Handling and Storage
Store galactinol in its original tightly closed container under the conditions specified on the manufacturer's label and safety data sheet. Keep the container closed when not in use and protect the material from moisture, since water-soluble carbohydrates readily take up atmospheric humidity, which can affect weighing accuracy and reference-standard reliability. Use clean, dry glass or chemically compatible plastic containers for prepared solutions, and label them clearly with the compound name, concentration, and preparation date. Handle the material in a well-ventilated area, avoid generating dust when weighing the powder, and wear standard laboratory personal protective equipment including a lab coat, safety glasses, and gloves. Prepare aqueous solutions fresh where analytical accuracy is critical, and consult the manufacturer's documentation before disposal.
