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楊大松至尊木蟲(chóng) (文壇精英)
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[求助]
HRESI-TOF 正離子 內(nèi)標(biāo),謝謝
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| HRESI-TOF 正離子譜上有分子量為502.2066的峰,為內(nèi)標(biāo)峰,請(qǐng)問(wèn)是什么化合物。 |

金蟲(chóng) (小有名氣)
金蟲(chóng) (小有名氣)
金蟲(chóng) (小有名氣)
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lemental Composition Report Single Mass Analysis Tolerance = 0.5 PPM / DBE: min = -1.5, max = 50.0 Element prediction: Off Number of isotope peaks used for i-FIT = 3 Monoisotopic Mass, Odd and Even Electron Ions 95681 formula(e) evaluated with 52 results within limits (all results (up to 1000) for each mass) Elements Used: C: 1-200 H: 1-200 N: 1-20 O: 0-30 F: 0-6 Na: 0-2 S: 0-10 Minimum: -1.5 Maximum: 5.0 0.5 50.0 Mass Calc. Mass mDa PPM DBE i-FIT Formula 502.2066 502.2066 0.0 0.0 0.0 n/a C13 H34 N10 F4 S3 502.2066 0.0 0.0 19.0 n/a C24 H23 N12 Na 502.2066 0.0 0.0 13.0 n/a C28 H30 N2 F4 S 502.2066 0.0 0.0 7.5 n/a C16 H32 N13 S3 502.2066 0.0 0.0 13.0 n/a C28 H32 N2 O2 F Na S 502.2066 0.0 0.0 2.0 n/a C17 H38 N6 O5 S3 502.2066 0.0 0.0 0.5 n/a C10 H31 N13 O3 F3 S2 502.2066 0.0 0.0 13.5 n/a C25 H29 N5 O5 Na 502.2066 0.0 0.0 13.5 n/a C25 H27 N5 O3 F3 502.2066 0.0 0.0 0.5 n/a C13 H28 N9 O2 F6 Na2 502.2066 0.0 0.0 1.5 n/a C20 H41 N3 O2 F S4 |
金蟲(chóng) (小有名氣)
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The normal internal standard for calculating the MS machine should be commercial available, stable and detectable in both positive and negative mode. C25H29N5O5Na is the sodium adduct of WFQ peptide. But, I never use it, normally we use Leucine enkephalin with M+H 556.2771 and M-H 554.2615 as internal standard for calculating the small molecules around the molecular weight. Some person also use the characterized compound from the sample submitter for calculating the same serial of their samples. Bunches of internal standard have been explored as internal standard from inorganic compounds like Naformate complex,drugs, pepetide, proteins, and glycan......... If the MS operator do not known what the standard is, asking the vendors related to MS facility will give an clue to find out what the 502.2066 is. |
木蟲(chóng) (正式寫(xiě)手)
至尊木蟲(chóng) (文壇精英)

木蟲(chóng) (正式寫(xiě)手)
至尊木蟲(chóng) (文壇精英)

至尊木蟲(chóng) (文壇精英)

至尊木蟲(chóng) (文壇精英)

金蟲(chóng) (小有名氣)
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