Ka ntle ho COA: Tataiso ea Tlhahlobo ea Tlhahlobo ea Peptide ea Mokha oa Boraro
Sehlooho se reng "98% bohloeki" ho morekisi Certificate of Analysis (COA) e fana ka maikutlo a fosahetseng a tšireletso bakeng sa batsamaisi ba boleng le bafuputsi ba ka sehloohong. Lipatlisisong tsa peptide ea maiketsetso le nts'etsopele ea biopharmaceutical, palo ea peresente e le 'ngoe e thathamisitsoeng tokomaneng e tloaelehileng ha e tiise botšepehi ba lik'hemik'hale, ts'ebetso ea likokoana-hloko, kapa ho ikatisa ha liteko.
Ka tshebetso, morekisi COA hangata ke kakaretso ea chromatography ea phase e le 'ngoe e kopantsoeng le netefatso ea boima.. Hangata e siea litšila tse tebileng tseo e seng tsa peptidic, counterion stoichiometry, masalla a chefo, le li-epimers tsa stereochemical. Ha mefuta ena e sa lekanyetsoang e kena litekong tsa setso sa lisele, lithuto tse tlamang sepheo, kapa mehlala ya diphoofolo, li baka chefo ea lisele, kinetics e tlamang e sa lebelloang, le data e sa khoneheng.
Ho lekola liphutheloana tsa tlhahlobo ea mokha oa boraro ho hloka ho sheba ka nqane ho likakaretso tsa boemo bo holimo. Ho theha moralo o sireletsehileng oa tlhahlobo ea boleng ho hloka hore ho hlahlojoe litlhahlobo tsa bohlokoa, ho beha litekanyetso tse tiileng tsa ho amohela, ho hlahloba likarolo tsa kopanyo ea chromatographic, ho tsamaisa maano a tlhahlobo ea orthogonal, le ho kenya ts'ebetsong melao e hlakileng ea nako ea ho hloka tlhahlobo e ncha ka hare ho ntlo.
Essential Analytical Assays and Numerical Acceptance Criteria
Sephutheloana se felletseng sa tlhahlobo ea peptide ea motho oa boraro se tlameha ho lekola bohloeki ba peptidic le ho leka-lekana ha boima ba 'mele.. Ho itšetleha feela ka liphesente tsa sebaka se phahameng sa chromatographic ho iphapanyetsa lipalo, metsi a tlamiloeng, masalla a organic solvents, le matsoai a inorganic, e akaretsang hangata 15% ho 35% ea boima ba sampole kaofela.
Sephutheloana sa tlhahlobo e matla se tlameha ho kenyelletsa liteko tse latelang, e tsamaisanang le litekanyetso tse hlakileng tsa ho amoheloa ha linomoro ho e-na le li-labels tsa boleng bo phahameng:
| Tlhahlobo ea Analytical | Mokhoa oa ho Leka oa Mathomo | Sepheo sa Tšobotsi ea Boleng | Mekhoa e Tloaelehileng ea Kamohelo ea Lipatlisiso | Biopharmaceutical / Litekanyetso tsa Kereiti ea Clinical |
|---|---|---|---|---|
| Bohloeki ba Chromatographic | RP-HPLC / UHPLC-UV (214 nm & 280 nm) | Liperesente tse amanang tsa sebaka sa peptide e shebiloeng khahlano le litšila tse amanang le peptidic | ≥ 95.0% sebaka | ≥ 98.0% - 99.0% sebaka |
| Boitsebiso & Netefatso ya Bongata | LC-MS ea boemo bo phahameng (Orbitrap / Q-TOF) kapa ESI-MS | Monoisotopic e bonoang / karolelano ea boima ba limolek'hule | Phoso e kholo ≤ 5 ppm (HRMS) kapa ± 0.5 Le (ESI-MS) | Phoso e kholo ≤ 2 ppm (HRMS) e nang le ts'ebetso ea tatellano ea MS/MS |
| Net Peptide Content (NPC) | Amino Acid Analysis (AAA) kapa Elemental N-Analysis | Peresente ea 'nete ea boima ba peptide e sebetsang ka milligram ea phofo | 65.0% - 85.0% ka boima (pepesitsoe motheo) | 75.0% - 88.0% ka boima (tlhophiso e khethehileng) |
| Residual Counterions | Ion Chromatography (KEA BONA) kapa Capillary Electrophoresis (CE) | Trifluoroacetate (TFA), acetate, tekanyo ea chloride | Tse senotsoeng (ka tlwaelo 10.0% - 20.0% TFA) | < 1.0% TFA (mofuta oa letsoai oa acetate kapa hydrochloride) |
| Mongobo | Karl Fischer Coulometric Titration (USP <921>) | Karolo ea boima ba metsi a tlanngoeng le a sa lefelloeng | ≤ 8.0% ka boima | ≤ 5.0% ka boima |
| Metsoalle ea Metsoalle ea Metsoako | Sebaka sa hlooho sa GC-MS / GC-FID (Ke Q3C) | Ho etsa lihlahisoa tse hlapollang (Acetonitrile, DMF, DCM, Piperidine) | Ka har'a Sehlopha sa ICH Q3C 2 & 3 meeli (mohlala, ACN < 410 ppm) | Acetonitrile < 410 ppm, DMF < 880 ppm, DCM < 600 ppm |
| Likokoana-hloko tsa Endotoxins | LAL Chromogenic / Tlhahlobo ea Turbidimetric (USP <85>) | Pyrogenic lipopolysaccharides | < 5.0 EU/mg phofo | < 0.1 EU/mg (kapa < 0.05 EU/mg bakeng sa litlhahlobo tse hlokolosi tsa lisele) |
| Litšila tsa mantlha | ICP-MS (USP <232> / Ke Q3D) | Litšepe tse boima (Pb, Joalo ka, Cd, Hg, Pd, Ho) | Kakaretso ea litšepe tse boima < 20 ppm | Meeli e ikhethileng ho latela ts'ebeliso ea letsatsi le letsatsi ea ICH Q3D |
Ts'ebetso e matla ea tlhahlobo e hloka hore tlhahlobo e tšehetsoe ke taolo e tiileng ea tikoloho nakong ea tlhahiso le boitokiso. Li laboratori tse sebelisang a sethala sa peptide synthesis ea bohloeki bo phahameng ka ts'ebetso e kopaneng ea phaposi ea ho hloekisa e netefatsa hore bokamorao bo na le likaroloana, boima ba mmele, le tšilafalo ea sefapano li laoloa pele ho tlhahlobo ea tlhahlobo.
Chromatographic Purity vs. Net Peptide Content: The Mathematical Discrepancy
E 'ngoe ea litlhaloso tse fosahetseng khafetsa tlhatlhobong ea boleng ba peptide ke equating HPLC Chromatographic Purity (% sebaka) ka Net Peptide Content (% boima).
Reversed-phase HPLC e lekanya ho monya ha leseli ho lekanyelitsoeng (hangata ho 214 nm) ka limolek'hule tse tsoang mokolokong. E bala sebaka sa tlhoro ea peptide e shebiloeng e arotsoe ke kakaretso ea litlhoro tsohle tse kopaneng:
Chromatographic Purity (% Area) = (Area of Target Peak / Total Integrated Area) × 100
Leha ho le joalo, boleng bona bo iphapanyetsa ka ho feletseng likarolo tse sa monyeng le tse sa hloekiseng tse kang li-counterions (trifluoroacetate, acetate), mongobo, metsoako e setseng, le matsoai a inorganic.
Boemo ba 'nete ba peptide e sebetsang ka har'a vial e nang le lyophilized e khethoa ke Net Peptide Content (NPC) foromo:
Net Peptide Content (% Mass) = 100% - (Water % + Counterion % + Residual Solvents % + Inorganic Ash %)
| Ntho | Lintlha |
|---|---|
| [ Sekotlolo sa Peptide ea Lyophilized | 10.0 mg Phofo ] |
| Net Peptide Content | 78.5% (7.85 mg peptide e sebetsang) |
| Counterion (TFA) | 13.2% (1.32 mg TFA letsoai) |
| Mongobo (Metsi) | 6.8% (0.68 mg tlamme H2O) |
| Metsoako e setseng (ACN/DMF) | 1.5% (0.15 mg masala a solvent) |
Haeba mofuputsi a lekanya 10.0 mg ea peptide e nang le 98.5% HPLC chromatographic purity empa e sa senoloa Net Peptide Content ea 75.0%, tharollo e hlahisoang e na le feela 7.50 mg ea peptide e sebetsang. Dosing e baloang ka monahano oa 9.85 mg thepa e sebetsang e hlahisa a 23.8% phoso e hlophisitsoeng ea tšebeliso e tlase, invalidating quantitative EC₅₀, IC₅₀, le litekanyo tsa pharmacokinetic.
Red Flags and Integration Anomalies in Vendor Analytical Reports
Lintlha tsa tlhahlobo tse tala tse fanoeng ke barekisi li tlameha ho hlahlojoa ka hloko. Barekisi ba sa tšepahaleng kapa lilaboratori tse sa lekaneng tsa tlhahlobo hangata li sebelisa mekhoa ea ho thetsa data ka har'a Chromatography Data Systems. (CDS) such as Empower or Chromeleon to artificially elevate reported purity values.
Quality managers should audit raw HPLC chromatograms and mass spectra for the following critical red flags:
1. Artificial Baseline Elevation and Noise Suppression
By manually elevating the baseline above low-level baseline noise and minor impurity peaks, minor deletion sequences or oxidation products are excluded from the integration table. This elevates a 92% pure sample to a reported “98.5% purity.”
Audit Check: Verify that the baseline follows the actual detector signal across the entire run time, including the gradient return period. The integration start and end points must sit cleanly on the baseline.
2. Shoulder Peak Masking and Suppression
Co-eluting impurities often appear as subtle “shoulders” on the leading or trailing edge of the main peptide peak. If the software peak-detection threshold is set too high, the system treats the shoulder as part of the parent peak rather than splitting it.
Audit Check: Inspect the main peak for asymmetry. The peak asymmetry factor (Joalo ka) should sit between 0.8 le 1.5. Any asymmetry factor exceeding 1.8 indicates co-eluting impurities or severe column overloading.
3. Tailing Peak Truncation and Split Integration Overrides
When an impurity elutes immediately after the main peak, analysts may apply a manual tangential skim or terminate integration prematurely, cutting off the tailing impurity area.
Audit Check: Examine the CDS audit trail markers printed on the chromatogram. Manual integration overrides leave system tags such as [M], [User], or forced baseline split markers. The absence of automated integration parameters is a primary compliance flag.
4. Single-Wavelength Selection Bias
Peptide bonds absorb strongly at 214 nm. Some vendors report purity exclusively at 280 nm, where only aromatic amino acids (Trp, Tyr, Phe) absorb. Non-aromatic deletion fragments or non-peptidic impurities remain completely invisible at 280 nm, yielding artificially inflated purity readings.
Audit Check: Confirm that chromatographic purity is reported at 214 nm kapa 220 nm. Dual-wavelength reporting (214 nm le 280 nm) using a Photodiode Array (PDA) detector should be required for aromatic-containing sequences.
5. Suspicious Mass Spectrometry Data
In mass spectrometry reports, common red flags include:
- Reporting only a single centroid peak without showing the full m/z spectrum.
- Mismatched charge states (mohlala, expecting [M+2H]²⁺ at m/z = 750.5 but observing prominent unassigned peaks at m/z = 761.5, indicating sodium adducts [M+Na+H]²⁺ or TFA adducts).
- Mass accuracy errors exceeding ± 0.5 Da on low-resolution instruments without explaining isotope distributions.
Method Validation Flags Under ICH Q2(R1) le USP <621>
An analytical report is only as valid as the analytical method used to generate it. Ho sebelisa mokhoa o sa netefatsoang oa HPLC - joalo ka moepa o moepa haholo o hlakisang metsoako eohle ho 3 metsotso-e tla hlōleha ho rarolla litšila tse amanang haufi-ufi.
Ho latela Ke Q2(R1) litataiso tsa netefatso, tlaleho e sireletsehileng ea tlhahlobo e tlameha ho bonts'a mekhoa e latelang ea mekhoa ea ts'ebetso:
Qeto ea Chromatographic (Rs)
Mokhoa o tlameha ho fihlela karohano ea mantlha lipakeng tsa tlhoro ea mantlha ea peptide le litšila tse haufi. Qeto e baloa joalo ka:
Rs = 2 × (tr2 - tr1) / (W1 + W2)
Moo t e emelang nako ea ho boloka 'me W e emela bophara ba tlhoro qalong. Maemo a kamohelo a tharollo ea motheo ke Rs ≥ 1.5.
System Suitability Parameters
Sehlopha se seng le se seng sa analytical batch se tlameha ho kenyelletsa liente tsa ho lekana ha sistimi pele ho tlhahlobo ea sampole. Hlokahalang parameters kenyeletsa:
- Asymmetry e phahameng (Joalo ka): 0.8 ≤ Joalo ka ≤ 1.5 ho 10% bophahamo ba tlhoro.
- Kholo e Atlehang (N): Theory plate count count N ≥ 3000 bakeng sa litšiea tse tloaelehileng tsa C18, kapa N ≥ 10,000 bakeng sa likholomo tsa UHPLC sub-2 µm.
- Ho Boloka Nako Precision: Phapang ea Maemo a Batlang (RSD) ea ho boloka nako ka bophara 5 liente tse pheta-phetoang li tlameha ho ba ≤ 1.0%.
- Peak Area Precision: Sebaka se phahameng sa RSD ≤ 2.0% bakeng sa liente tse ikatisang.
Limit of Quantitation (LOQ) and Detection (LOPO)
Mokhoa oa ho hlahloba o tlameha ho senola meeli ea eona ea kutlo e ipapisitseng le karo-karolelano ea Signal-to-Noise (S/N):
- Moeli oa ho Fumana (LOPO): S/N ≥ 3:1
- Limit of Quantitation (LOQ): S/N ≥ 10:1
Haeba litlhōrō tse nyenyane tsa litšila li kopantsoe ka tlase ho LOQ e tiisitsoeng, liphesente tsa libaka tse tlalehiloeng ha li tšepahale ka bongata.
Orthogonal Testing Strategies: Uncovering Hidden Impurities
Molao oa motheo oa k'hemistri ea tlhahlobo ke hore ha ho mokhoa o le mong oa karohano o ka bonang litšila tsohle tse ka bang teng. HPLC ea mokhahlelo o khutlisetsoang e arola metsoako e ipapisitseng le tšebelisano ea hydrophobic le karolo e seng ea polar stationary. (joalo ka C18 kapa C8). Litšila tse nang le hydrophobicities tse ts'oanang le peptide e shebiloeng li tla kopana joalo ka tlhoro e le 'ngoe., ho sa natsoe bolelele ba litšiea kapa nako ea mothapo.
Ho tsamaisa a leano la tlhahlobo ea orthogonal- Ho kopanya mekhoa ea tlhahlobo e sebetsang ho melao-motheo e ikemetseng ea physicochemicals - ho bohlokoa bakeng sa netefatso ea boleng bo felletseng..
Hlokolohile / Mohlala o hloekisitsoeng oa Peptide
Tefiso ea Hydrophobicity & Boholo ba molek'hule (RP-HPLC / UHPLC) (PHUPTJANE / IEC) (SEC-HPLC) Sebaka sa Bohloeki (%) Charge Variant Soluble Aggregates Related Litšila & Diastereomers & Multimers Orthogonal Identity & Letsoai QC High-Res LC-MS/MS (Mmisa & Tatelano) Ion Chromatography (TFA / Acetate) Sebaka sa hlooho sa GC-MS (Metsoako e setseng)
1. Capillary Zone Electrophoresis (PHUPTJANE) khahlano le. RP-HPLC
CZE e arola limolek'hule ka har'a capillary e bulehileng ho latela motsamao oa tsona oa electrophoretic, e khethoa ke karo-karolelano ea tefiso-to-hydrodynamic-radius. Leha RP-HPLC e kanna ea hloleha ho arola peptide e shebiloeng ho tatellano ea ho hlakola e haelloang ke masala a leucine a sa nke lehlakore., CZE e rarolla mathata a tefiso habonolo, C-terminal amidation ho se lumellane, le lihlahisoa tsa deamidation.
2. Size Exclusion Chromatography (SEC-HPLC)
Likholomo tsa Hydrophobic RP-HPLC hangata li tlama li-peptide tse sa kopaneng ka mokhoa o ke keng oa fetoloa., kapa etsa hore li-aggregates li arohane ho ba li-monomers ka lebaka la mekhahlelo ea mehala ea tlhaho (acetonitrile/TFA). SEC-HPLC e sebelisa isocratic, buffer e nang le metsi tlasa maemo a sa tsitsang ho arola dimers tse qhibilihang, trimers, le li-aggregate tsa maemo a holimo tse ipapisitseng le molumo oa hydrodynamic.
3. Ion Chromatography (KEA BONA) for Counterion Quantification
Li-counterions tse kang trifluoroacetate (TFA⁻) le acetate (OAc⁻) ha e na li-chromophore tse matla tsa UV 'me e ke ke ea hlalosoa ka nepo lits'ebetsong tse tloaelehileng tsa RP-HPLC-UV.. Ion Chromatography e kopantsoeng le tlhahlobo e hatelitsoeng ea conductivity e fana ka kotloloho, palo e nepahetseng haholo ea li-anionic counterions ho ea ho likarolo-ka-millione.
4. Marfey's Derivatization bakeng sa Enantiomeric Purity
Mokhahlelo o tiileng oa peptide synthesis (SPSS) e ka etsa hore ho be le racemization ea masala a amino acid (haholo-holo Cys le ea Hae), ho fella ka D-amino acid epimers. Hobane li-D-enantiomers li na le boima bo tšoanang le hydrophobicities libakeng tsa achiral, li kopane le L-peptides ho RP-HPLC e tloaelehileng. Reagente ea Marfey (1-fluoro-2,4-dinitrophenyl-5-L-alanine amide, L-FDAA) e kopana le hydrolyzate amino acid ho etsa diastereomer, tse arohanngoang habonolo le ho baloa likholomong tse tloaelehileng tsa C18.
Ha o laola liphetoho tse rarahaneng tsa tatellano kapa merero ea bioconjugation, ho fumana ka litšebeletso tse khethehileng tsa tlhahlobo ea peptide CRO e netefatsa phihlello ea liphanele tsa orthogonal tse netefalitsoeng ka botlalo, ho kenyelletsa le CZE, SEC, le tatellano ea sekhechana sa MS/MS ea boemo bo holimo.
Moralo oa Qeto: Ka hare ho Ntlo Reanalysis vs Vendor Data Reliance
Batsamaisi ba boleng le bafuputsi ba ka sehloohong ba ke ke ba etsa tlhahlobo e felletseng ea orthogonal sebakeng se seng le se seng se kenang sa peptide ntle le ho ba le litšenyehelo tse thibelang le ho lieha ha kemiso.. Ka lehlakoreng le leng, ka bofofu ho tšepa barekisi COAs e hlahisa kotsi e kholo.
Matrix ea liqeto tse 4 tse latelang e theha protocol e thehiloeng ho kotsi ho tseba hore na ho ka amoheloa neng liphutheloana tsa tlhahlobo ea barekisi khahlano le ho laela motho ea ikemetseng kapa tlhahlobo ea ka tlung.:
| Boemo ba Kotsi | Kopo / Sebelisa Case Scenario | Tlhokahalo ea Sephutheloana sa barekisi ba COA | E Tlamang ka Ntlong / Protocol ea Reanalysis ea Mokha oa Boraro |
|---|---|---|---|
| Boemo 1: Kotsi e Tlase | Tlhahlobo ea mantlha ea li-antibody, liteko tsa pele tse tlamang tsa boleng, tlhahiso ea matheba a pele | Morekisi COA e bontšang bohloeki ba RP-HPLC ≥ 90% le netefatso ea bongata ba ESI-MS | Tlhahlobo ea ponahalo ea pono; netefatsa boima ka hare ho ± 1.0 Le; ha ho reanalysis e hlophisitsoeng e hlokahalang. |
| Boemo 2: Kotsi e Itekanetseng | Litlhahlobo tse ngata tsa in vitro cell, litekanyetso tsa tekolo, lithuto tsa pele tsa SAR | COA e khethehileng ka sehlopha e nang le trace ea RP-HPLC (214 nm), MS spectrum, mme e senotse motheo oa Net Peptide Content | Tlhahlobo e ikemetseng ea RP-HPLC ka tlung le netefatso ea mongobo ea Karl Fischer ho 10% ea lotho tse kenang. |
| Boemo 3: Kotsi e Phahameng | Lithuto tsa liphoofolo tsa in vivo, botsitso ba sebopeho, bioconjugation (ADC/PDC), kamano ea sebopeho-ketso (SAR) etella pele | Sephutheloana sa tlhahlobo e felletseng: RP-HPLC trace e nang le liparamente tsa kopanyo, HRMS (≤ 5 phoso ea ppm), Litaba tsa IC counterion, Endotoxin ea LAL (< 1 EU/mg), le metsoako e setseng ea GC-HS | Netefatso e tlamang ea motho oa boraro kapa ea ka tlung ea bohloeki ba HPLC, Boitsebiso ba HRMS, Net Peptide Content, le maemo a endotoxin pele ho tekanyetso. |
| Boemo 4: Bohlokoa / Tleliniki | GLP toxicology, Lithuto tse nolofaletsang IND, liteko tsa bongaka tsa batho, Tlhahiso ea sehlopha sa GMP | Sephutheloana se felletseng sa COA se netefalitsoeng ka GMP tlasa ISO 17025 / cGMP e nang le litlaleho tsa CDS tsa trail, tlhahlobo ea CZE/SEC ea orthogonal, le data e felletseng ea ICH ea botsitso | Netefatso e felletseng ea tlhahlobo ea GLP/GMP ho latela liprothokholo tse lokollotsoeng; tlhahlobo e ikemetseng ea setsi sa tlhahiso ea barekisi le kamore ea bohloeki. |
Letšoao le Lefubelu le Hlohlelletsang ho Laela ho Hlahlobisisa Hang-hang
Ho sa tsotelehe boemo ba kotsi, lintho tse kenang li tlameha ho behelloa ka thoko 'me li behoe tlas'a tlhahlobo e ikemetseng hanghang haeba ho na le tse ling tsa lintho tse susumetsang tse latelang.:
- Phapang Lipalong Tsa Lotho: Nomoro ea lotho ka har'a vial ea 'mele ha e tsamaellane le nomoro ea lotho tokomaneng ea COA hantle.
- Lintlha tse tala tse sieo: COA e thathamisa peresente ea bohloeki (mohlala, "98.2%") but fails to include the actual chromatographic trace and integration table.
- Evidence of CDS Manipulation: Chromatogram exhibits elevated baselines, missing integration marks, or unverified manual integration tags (
[M]). - Physical Discrepancy: Lyophilized cake appears discolored, oily, or incompletely lyophilized, suggesting high residual solvent or moisture levels.
- Inconsistent Bioassay Results: Downstream assay exhibits anomalous toxicity or a shift in potency exceeding 20% between consecutive vendor batches.
Where sterile processing and ultralow endotoxin parameters are paramount, verifying production within Sehlopha 100 ultra-sterile cleanroom production environments provides essential upstream assurance, reducing batch-to-batch analytical variance and contamination risks.
Lipotso Tse Botsoang Khafetsa (LBH)
Phapano ke efe lipakeng tsa bohloeki ba peptide le net peptide content?
Peptide e hloekileng (bohloeki ba chromatographic) represents the percentage of target peptide relative to related peptidic impurities, e lekantsoeng ka sebaka se phahameng sa chromatogram ea HPLC. Net Peptide Content (NPC) e emela karolo ea 'nete ea boima ba peptide sampoleng, ho ela hloko likaroloana tseo e seng tsa peptidic joalo ka counterions (TFA, acetate), mongobo, le masalla a organic solvents.
Hobaneng ha litaba tsa TFA counterion li tšoenyehile litlhahlobong tsa li-cell culture bioassays?
Trifluoroacetate (TFA) ke counterion ea indasteri e chefo e sebelisoang hangata nakong ea tlhoekiso ea RP-HPLC. Matsoai a setseng a TFA ka litokisetso tsa peptide a thibela ho ata ha lisele, e baka chefo ea lisele tsa membrane, le ho fetola pH ea fisioloji maemong a milimilar, e lebisang ho sephetho se fosahetseng kapa se fosahetseng litekong tsa lisele.
Na HPLC chromatogram e ka bontša 99% bohloeki bakeng sa peptide e senyehileng?
Ee. Haeba lihlahisoa tsa ho senyeha ha li qhibilihe, kopanya ka mekgatlo e meholo e dulang hloohong, kapa ho haelloa ke ho monya ha UV ka bolelele bo khethiloeng (mohlala, tlaleho ka 280 nm bakeng sa li-peptide tse sa nkhang hamonate), HPLC chromatogram e tla bontša tlhoro e le 'ngoe e hloekileng ea 99% bohloeki ha sampole ea peptide e sebetsang e senyehile haholo.
Ke ho nepahala hofe ho hlokahalang ho netefatsa boitsebiso ba peptide ea maiketsetso?
Bakeng sa spectrometry ea boima bo tlaase (ESI-MS kapa MALDI-TOF), ho nepahala ha boima ho lokela ho oela ka hare ho ± 0.5 Da ea boima ba monoisotopic kapa karolelano ea boima ba limolek'hule. Bakeng sa spectrometry ea boima bo phahameng bo phahameng (HRMS ka Orbitrap kapa Q-TOF), phoso ea ho nepahala ha boima ha ea lokela ho feta ≤ 5 ppm.
Hobaneng ho lemohuoa ha UV ea leqhubu le le leng ho 280 nm ha e lekane bakeng sa li-COA tsa peptide?
Li-amino acid tse nkhang hamonate feela (Tryptophan, Tyrosine, le Phenylalanine) monya leseli la UV ho 280 nm. Litlamo tsa mokokotlo oa peptide li monya ka matla ho 214 nm. Ho tlaleha bohloeki ho 280 nm e pata ka botlalo tatellano ea ho hlakola e sa nkhang hamonate, maqhetsoana a qhetsoeng, le litšila tse sa tsoakoang ke peptidic, ho fana ka boleng ba bohloeki bo iketlileng.
Mehato e Latelang bakeng sa Tiiso e Matla ea Boleng ba Peptide
Ho theha taolo e matla ea boleng ba tlhahlobo ho hloka ho tšoara Litifikeiti tsa Tlhahlobo ea barekisi e le lintlha tsa pele ho fapana le bopaki bo felletseng.. Baokameli ba boleng le bafuputsi ba ka sehloohong ba lokela ho hlahloba lintlha tse tala tsa CDS, tsitlallela tlalehong e felletseng ea boima ba 'mele (ho kenyelletsa Net Peptide Content le counterion quantification), le ho qobella liprothokholo tsa tlhahlobo ea orthogonal tse lekanang le kotsi ea projeke.
Bakeng sa lihlopha tsa lipatlisiso tse batlang ho tsebahala ka botlalo, li-peptide tsa tloaelo tse hloekileng haholo tse tšehelitsoeng ke liphutheloana tsa tlhahlobo tse pepeneneng le tlhahiso e netefalitsoeng ea likamore tse hloekileng, ho batlisisa bokhoni bo khethehileng ba ho kopanya le CRO ho netefatsa katleho ea projeke le ho ikatisa ha liteko. Ikopanye le sehlopha sa tekheniki ho Liphetoho tsa MOL ho lekola likhetho tse felletseng tsa tlhahlobo le ho kopa liphutheloana tsa tlhahlobo tse ikhethileng bakeng sa mohato oa hau o latelang oa lipatlisiso..
