The myo-Inositol Assay Kit is a reliable and accurate enzymatic UV-method for the specific measurement and analysis of myo-inositol in foods, dairy products and various other materials.

Phytic acid content of samples with very low levels of free myo-inositol can also be determined using K-INOSL. This can be achieved by measuring the amount of myo-inositol released after de-phosphorylation of phytic acid with the enzymes phytase and alkaline phosphatase, as used with the Megazyme Phytic Acid/Total Phosphorus Assay Kit (K-PHYT).

Not suitable for the determination of myo-inositol in baby formula.

L-Lysine production independent of the oxidative pentose phosphate pathway by Corynebacterium glutamicum with the Streptococcus mutans gapN gene.

Takeno, S., Hori, K., Ohtani, S., Mimura, A., Mitsuhashi, S. & Ikeda, M. (2016). Metabolic engineering, 37, 1-10. Link to Article Read Abstract We have recently developed a Corynebacterium glutamicum strain that generates NADPH via the glycolytic pathway by replacing endogenous NAD-dependent glyceraldehyde 3-phosphate dehydrogenase (GapA) with a nonphosphorylating NADP-dependent glyceraldehyde 3-phosphate dehydrogenase (GapN) from Streptococcus mutans. Strain RE2, a suppressor mutant spontaneously isolated for its improved growth on glucose from the engineered strain, was proven to be a high-potential host fof L-lysine production (Takeno et al., 2010). In this study, the suppressor mutation was identified to be a point mutation in rho encoding the transcription termination factor Rho. Strain RE2 still showed retarded growth despite the mutation rho696. Our strategy for reconciling improved growth with a high level of L-lysine production was to use GapA together with GapN only in the early growth phase, and subsequently shift this combination-type glycolysis to one that depends only on GapN in the rest of the growth phase. To achieve this, we expressed gapA under the myo-inositol-inducible promoter of iolT1 encoding a myo-inositol transporter in strain RE2. The resulting strain RE2A^iol was engineered into an L-lysine producer by introduction of a plasmid carrying the desensitized lysC, followed by examination for culture conditions with myo-inositol supplementation. We found that as a higher concentration of myo-inositol was added to the seed culture, the following fermentation period became shorter while maintaining a high level of L-lysine production. This finally reached a fermentation period comparable to that of the control GapA strain, and yielded a 1.5-fold higher production rate compared with strain RE2. The transcript level of gapA, as well as the GapA activity, in the early growth phase increased in proportion to the myo-inositol concentration and then fell to low levels in the subsequent growth phase, indicating that improved growth was a result of increased GapA activity, especially in the early growth phase. Moreover, blockade of the pentose phosphate pathway through a defect in glucose 6-phosphate dehydrogenase did not significantly affect L-lysine production in the engineered GapN strains, while a drastic decrease in L-lysine production was observed for the control GapA strain. Determination of the intracellular NADPH/NADP⁺ ratios revealed that the ratios in the engineered strains were significantly higher than the ratio of the control GapA strain irrespective of the pentose phosphate pathway. These results demonstrate that our strain engineering strategy allows efficient L-lysine production independent of the oxidative pentose phosphate pathway.

Regulation of myo-inositol biosynthesis by p53-ISYNA1 pathway.

Koguchi, T., Tanikawa, C., Mori, J., Kojima, Y. & Matsuda, K. (2016). International Journal of Oncology, 48(6), 2415-2424. Link to Article Read Abstract In response to various cellular stresses, p53 exerts its tumor suppressive effects such as apoptosis, cell cycle arrest, and senescence through the induction of its target genes. Recently, p53 was shown to control cellular homeostasis by regulating energy metabolism, glycolysis, antioxidant effect, and autophagy. However, its function in inositol synthesis was not reported. Through a microarray screening, we found that five genes related with myo-inositol metabolism were induced by p53. DNA damage enhanced intracellular myo-inositol content in HCT116 p53+/+ cells, but not in HCT116 p53-/- cells. We also indicated that inositol 3-phosphate synthase (ISYNA1) which encodes an enzyme essential for myo-inositol biosynthesis as a direct target of p53. Activated p53 regulated ISYNA1 expression through p53 response element in the seventh exon. Ectopic ISYNA1 expression increased myo-inositol levels in the cells and suppressed tumor cell growth. Knockdown of ISYNA1 caused resistance to adriamycin treatment, demonstrating the role of ISYNA1 in p53-mediated growth suppression. Furthermore, ISYNA1 expression was significantly associated with p53 mutation in bladder, breast cancer, head and neck squamous cell carcinoma, lung squamous cell carcinoma, and pancreatic adenocarcinoma. Our findings revealed a novel role of p53 in myo-inositol biosynthesis which could be a potential therapeutic target.

Colourimetric method for the determination of myo-Inositol in various sample matricesPrinciple: (myo-inositol dehydrogenase)(1) myo-Inositol + NAD⁺ → 2,4,6/3,5-pentahydroxycyclohexanone + NADH + H⁺ (diaphorase)(2) INT + NADH + H⁺ → NAD⁺ + INT-formazan

Kit size: *50 assays

*The number of manual tests per kit can be doubled if all volumes are halved.This can be readily accommodated using the MegaQuant^TMWaveSpectrophotometer (D-MQWAVE).

Method: Spectrophotometric at 492 nmReaction time: ~ 25 minDetection limit: 0.8 mg/LApplication examples: Animal feeds, food, baby milk formulation and other materialsMethod recognition: Novel method

Advantages

• Very cost effective
• All reagents stable for > 2 years after preparation
• Only enzymatic kit available
• Rapid reaction
• Mega-Calc™ software tool is available from our website for hassle-free raw data processing
• Standard included

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