Comparisons of Major Biochemical Constituents and Mineral Composition in Six Cultivars of Aromatic Rice in Manipur

Salam, Jekendra Singh; Devi, N Surbala; Salam, Priyadarshini; Singh, RK Dilip

doi:10.5958/0976-1926.2017.00007.9

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“…In general, the signal suppression effect stems from the compete co-eluting compounds with target compounds in the ionization processes or reduced radius of droplets (Hajslová & Zrostlíková, 2003). Co-eluting compounds, including starch, protein and lipids, pigments, greases, saccharides, starch, total phenolic and so on, possibly exist in rice plants, brown rice and rice hull matrices (Rizov & Doulis, 2000;Salam, Devi, Salam, & Singh, 2017;Wang, Huang, Liu, & Wang, 2009;Wang, Zhang, Lu, Kuang, & Li, 2002;Zhou, Robards, Helliwell, & Blanchard, 2010). Therefore, matrix-matched calibrations curves were used for quantitative analysis to effectively avoid the quantitative inaccuracy problem caused by the matrix effect in this study.…”

Section: Extraction and Purificationmentioning

confidence: 99%

Degradation and residues of indoxacarb enantiomers in rice plants, rice hulls and brown rice using enriched S‐indoxacarb formulation and enantiopure formulation

Shi

Gui

Zhao

et al. 2018

Biomedical Chromatography

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A chiral liquid chromatography-tandem high resolution mass spectroscopic method was developed for the analysis of indoxacarb enantiomers in rice plants, rice hulls and brown rice. Chiral separation of two enantiomers was carried out on a Superchiral S-OD column maintained at 20°C and eluted with 0.3 mL/min methanol. Samples were extracted by acetonitrile solution with ultrasound and cleansed by dispersive solid-phase extraction of 50 mg of primary secondary amine and 50 mg of C . This method was successfully used to study the degradation and residues of two enantiomers with enriched S-indoxacarb (2.33S/1R) and pure S-indoxacarb in rice plants. The half-lives of R-indoxacarb and S-indoxacarb were 4.20-4.33 and 3.45-3.57 days in rice plants during the degradation of enriched S-indoxacarb in Guizhou and Hunan, respectively, whereas the half-lives of pure S-indoxacarb were 2.68 and 3.69 days in Guizhou and Hunan, respectively. The results indicated that preferential S-indoxacarb degradation occurred and that enantiomeric transformation was absent in the total experiment periods of pure S-indoxacarb in rice plants. The final residue concentrations of indoxacarb enantiomers in brown rice were significantly less than those in rice plants and rice hulls in the same rice field after applying indoxacarb SC and indoxacarb EC.

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