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plan-spectroscopic-analysis【数据与研究】Plan a comprehensive spectroscopic analysis campaign by defining the analytical question, assessing sample characteristics, selecting appropriate techniques using a decision matrix, planning sample preparation for each technique, sequencing analyses from non-destructive to destructive, and defining success criteria with a cross-validation strategy.
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設譜析役、擇正術、效次之、定成則含交驗策也。
擇術前明所需信:
別問型:
定成則:明述何為足答。構識:「單構提合諸譜資」。量:「濃定相誤 < 5%」。
察已知:匯諸樣前資(元析、應圖、預品、文先)。此縮問減術數。
得:明析問含定成則與已知撮。
敗:問模糊(「徵此樣」)→與請者縮之。模問致散析、費機時。
評樣以定何術可行:
得:樣徵撮列態、量、溶、穩、險、分量範。
敗:樣不可徵 (如量太小不能試溶)→保策:始於非毀少樣術 (Raman、ATR-IR)、初果後再評。
按析問與樣特擇最信術:
| Technique | Best For | Sample Needs | Destructive? | Sensitivity | Key Limitations |
|---|---|---|---|---|---|
| 1H NMR | H connectivity, integration, coupling | 1--10 mg in deuterated solvent | No | mg | Requires solubility, insensitive |
| 13C NMR | Carbon skeleton, functional groups | 10--50 mg in deuterated solvent | No | mg | Very insensitive, long acquisition |
| 2D NMR | Full connectivity, stereochemistry | 5--20 mg in deuterated solvent | No | mg | Hours of instrument time |
| IR (ATR) | Functional group ID | Any solid/liquid, minimal prep | No | ug | Water interference, fingerprint overlap |
| IR (KBr) | Functional group ID, transmission | 1--2 mg solid in KBr pellet | No* | ug | Moisture sensitive, sample mixed |
| Raman | Symmetric modes, aqueous samples | Any state, no prep for solids | No | ug--mg | Fluorescence, photodegradation |
| EI-MS | Volatile small molecules, fragmentation | ug, must be volatile | Yes (GC-MS) | ng--ug | Requires volatility |
| ESI-MS | Polar/large molecules, MW determination | Solution in volatile solvent | Yes | pg--ng | Adduct complexity, ion suppression |
| MALDI-MS | Polymers, proteins, large molecules | Solid + matrix | Yes | fmol | Matrix interference below 500 Da |
| UV-Vis | Chromophores, quantitation | Solution, ug--mg | No | ug | Limited structural information |
*IR with KBr is non-destructive to the molecule but the sample cannot be easily recovered from the pellet.
得:選術序列含各擇由與排術之由。
敗:無單術足(構識常然)→計含補術合答問。無適術→注限、薦他析徑(如衍化使樣宜 GC-MS)。
各擇術定備需:
| Solvent | 1H Residual | Use When |
|---|---|---|
| CDCl3 | 7.26 ppm | Non-polar to moderately polar compounds |
| DMSO-d6 | 2.50 ppm | Polar compounds, broad solubility |
| D2O | 4.79 ppm | Water-soluble compounds, peptides |
| CD3OD | 3.31 ppm | Polar organic compounds |
| C6D6 | 7.16 ppm | Aromatic region overlap avoidance |
IR 備:按樣態擇法:
MS 備:配離法於樣:
UV-Vis 備:溶於 UV 透溶。調濃使 lambda-max 吸於 0.1 至 1.0 間。樣參用配池。
Raman 備:多樣需備少。固可裸測。液於玻管(玻 Raman 散弱)。避螢容。水溶 Raman 行(水 Raman 散弱)。
得:各擇術之備則含溶擇、需量、特處。
敗:樣不足諸計術→按步三信序序。樣於諸適溶皆不溶→計固態術 (ATR-IR、Raman、固 NMR、MALDI-MS)。
序析以保樣與最大信流:
按毀性序:非毀術先、毀術末。
信流:用早果精晚析:
定交驗點:識諸術果當合處:
計變:定初果模時當行何加驗:
記計:書析計含術序、樣備、預返時、變驗決點。
得:完序析計含備則、交驗則、變備已記。
敗:計因樣或機限不可成→明記限、提最佳可行子集。
interpret-nmr-spectrum -- 釋按此計取之 NMR 資interpret-ir-spectrum -- 釋按此計取之 IR 資interpret-mass-spectrum -- 釋按此計取之 MS 資interpret-uv-vis-spectrum -- 釋按此計取之 UV-Vis 資interpret-raman-spectrum -- 釋按此計取之 Raman 資validate-analytical-method -- 驗此計擇之量法