L(+)-Arabinose is a pentose monosaccharide whose transcription is regulated by Ara-C proteins and is a substrate for L-arabinose dehydrogenase, galactose dehydrogenase. It is not fermented by yeast. Used as a one-way or reversible switch for protein expression. It is also used to make arabinosyl nucleosides. L-Arabinose is used as a substrate to identify, differentiate and characterize pentose sugar isomerase(s). L-Arabinose is used in the bioproduction of L-ribose. L-Arabinose is the naturally occurring isomer and is a constituent of plant polysaccharides. Most bacteria contain an inducible arabinose operon that codes for a series of enzymes and transporters that allows L-arabinose to be used as the sole carbon source in microbial culture.||Synonyms: |Beta-L-Arabinopyranose; Beta-L-(+)-ARABINOSE; L-(+)-Arabinose; Pectinose; Arabitol, L-(-)-(RG); L-Arabinopyranose; (2R,3R,4S,5S)-oxane-2,3,4,5-tetrol| |CAS No:|87-72-9 ||Molecular Formula:|C5H10O5 ||Molecular Weight:|150.13| |Purity (HPLC):|≥99%||Appearance:|White crystalline powder||Melting Point:|154-160ºC| |Optical Rotation:|amD20 = +101 to +105º||Moisture:|≤0.5%||Heavy Metals (Pb):|≤0.001%||Storage and Stability:|Powder may be stored at RT. Stable for 12 months.