Gas Chromatography-Mass Spectrometry (GC-MS) bụ usoro nyocha dị ike nke na-ejikọta ikike nkewa nke gas chromatography na ike njirimara nke mass spectrometry. A na-eji usoro a eme ihe nke ukwuu maka nyocha ogo n'ọtụtụ ngalaba, gụnyere nlekota gburugburu ebe obibi, nchekwa nri, na sayensị nyocha. Isiokwu a ga-atụle ụkpụrụ nke mwepụta data mass spectrometry, ihe nrịbama njide, na usoro dị elu na nyocha GC-MS.
Nkebi nke 1: Nweta Database Mass Spectrometry
Ugbu a, a na-eji ihe nlele quadrupole mass spectrometry arụ ọtụtụ nchekwa data Electron Ionization (EI). Ụdị ihe nlele mass ndị ọzọ nwere ike igosi mmetụta ịkpa ókè oke, nke nwere ike ibute enweghị nkọwa na njirimara nke ihe mejupụtara. Na nyocha GC-MS, ọ dị mkpa iwepụ mkpọtụ ndabere iji mee ka ntụkwasị obi nke nsonaazụ ahụ dịkwuo elu. Nzọụkwụ a na-eme ka o doo anya na ihe mgbaàmà ndị e nwetara bụ ihe nnọchiteanya nke ndị nyocha nke mmasị kama ihe ochie ma ọ bụ ihe ndị na-emerụ ahụ.
Mgbe ị na-ahọrọ ụdị spectra maka njirimara, mmadụ ga-akpachara anya maka nsogbu ionization kemịkalụ ndị nwere ike ịpụta. Ụzọ ionization dị iche iche nwere ike ibute ụdị nkewa dị iche iche, na-eme ka usoro njirimara sie ike. N'ime usoro spectrometry dị iche iche, a na-amata spectrometry mass quadrupole maka izi ezi ya kachasị elu, nke a na-eme atụmatụ na ihe dị ka 25%. Ma e jiri ya tụnyere ya, ion trap mass spectrometry na-esochi ya na obere izi ezi, ebe Time-of-Flight (TOF) mass spectrometry na-enwekarị ọnụego mgbake na-adịghị mma. Nke a na-egosi mkpa ọ dị ịhọrọ usoro spectrometry mass kwesịrị ekwesị dabere na ihe achọrọ nyocha kpọmkwem.
Nkebi nke 2: Ụkpụrụ na Ụzọ nke Ndekọ Njide Nyocha Ogo
Ndekọ njide (RI) bụ ihe dị mkpa na GC-MS nke na-enyere aka n'ịchọpụta njirimara nke ihe mejupụtara. N'okpuru ebe a bụ GC nke Diallyl trisulfide na 4-methylthiazole.
Ndepụta Nchekwa n'okpuru Ọnọdụ Isothermal:
N'ime nhazi okpomọkụ gas chromatography mgbe niile, oge njide nke n-alkanes abụọ nwere atọm carbon n na N nwere ike igosipụta dị ka ndị a:
RI = 100n+100[Nn]*[log t'–log t'n]/[log t'N -log t'n]
t'= t- tm; t'n = tn - tm; t'N = tN- tm bụ oge ọnwụ.
Ndepụta Nchekwa n'okpuru Ọnọdụ Okpomọkụ Emebere:
N'ime ntọala nke e mere atụmatụ maka okpomọkụ, enwere ike ịgbakọ ndeksi njide site na iji oge njide n'ezie kama ụkpụrụ logarithmic ha: RI = 100n+100[Nn]*[t –tn]/[tN - tn]
Ihe Ndị Na-emetụta Ndepụta Nchekwa:
Ọtụtụ ihe nwere ike imetụta ihe e ji ejide ihe, gụnyere ụdị usoro eji eme ihe, mmemme okpomọkụ, na ụdị matriks ihe atụ. Ịghọta ihe ndị a dị mkpa maka nyocha ziri ezi nke àgwà.
Usoro Ogo Kọlụm Abụọ:
Usoro a gụnyere ịgbakọ ihe nrịbama njide nke ihe ndị dị na usoro abụọ dị iche iche nke polar standard. Ọ bụrụ na ihe nrịbama njide abụọ ahụ dakọtara na nke ihe ndị a na-ejikarị eme ihe, enwere ike nweta njirimara njirimara mbụ.
Nkebi nke 3: Usoro nke Tandem Mass Spectrometry
Usoro nyocha nke Tandem mass (MS/MS) na-eme ka nyocha nke ọma ka mma site n'ikwe ka ion kewaa, na-enye ozi nhazi ọzọ. Usoro a bara uru karịsịa maka ngwakọta dị mgbagwoju anya, na-eme ka a mata ihe ndị nwere ike ọ gaghị ekwe omume ịchọpụta n'otu ọkwa nke mass spectrometry.
Nkebi nke 4: Nnyocha MS Quality nke Nwere Mkpebi Dị Elu
Usoro nyocha oke mkpebi na mkpebi dị elu na-enye ezigbo izi ezi na mkpebi oke, na-eme ka ọ bụrụ ngwaọrụ bara uru maka nyocha ogo. Usoro a dị irè karịsịa n'ịchọpụta ọdịiche dị n'etiti isomers na ihe ndị metụtara ya, nke dị oke mkpa na nyocha ihe atụ dị mgbagwoju anya.
Nkebi nke 5: Nyocha nke GC-MS nke Mmeghachi Omume Ion-Molecule
Mmeghachi omume ion-molekul na GC-MS nwere ike inye nghọta banyere mmeghachi omume na nhazi nke ihe ndị na-agbanwe agbanwe. Nhazi zuru oke nke ngwa spectrometry mass maka nyocha ihe ndị na-agbanwe agbanwe dị oke mkpa maka nsonaazụ ziri ezi. Atụmatụ maka nyocha ogo nke ihe ndị na-agbanwe agbanwe na-agụnyekarị nhọrọ nke usoro ionization nke ọma na imeziwanye ọnọdụ chromatographic.
Na mmechi, GC-MS bụ usoro dị mgbagwoju anya nke na-ejikọta ikike nkewa nke gas chromatography na ike njirimara nke mass spectrometry. Site n'iji nchịkọta data mass spectrometry, ngụkọ njikwa ihe ndekọ, na usoro dị elu, ndị nyocha nwere ike nweta nsonaazụ dị mma a pụrụ ịtụkwasị obi, na-eme ka GC-MS bụrụ ngwaọrụ bara uru na ngalaba sayensị dị iche iche.
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