Izifundo zokuqina zihlola ukuthi amasampula wokuhlaziya (isb. Isitoreji samazinga okushisa esiphakeme nesiphansi singakhanyisa ukucekelwa phansi kwamakhemikhali, izinguquko ezihlelekile, noma ukuhlukaniswa kwesigaba; Ukuvezwa okukhulu kokukhanya kungadala ukuqina kwebhondi noma ukusabela kwama-chain free-radical, okubangela i-photodegradation. Uphenya ngokuhlelekile imiphumela ye-physichicochemical ka-40 ° C, -20 ° C, futhi ukukhanya ngezinhlobo ezahlukahlukene zesampula kubalulekile ekuqinisekiseni ikhwalithi nokwethembeka. Leli phepha ligxile ezimweni zemibhalo yethiyori kanye nezindlela zezendlela zalezi zimo ezintathu ezedlulele kuma-molekyuli amancane, izixazululo zensimbi, kanye nezinhlanganisela ze-photosensive, futhi ziphakamisa izilinganiso ezihambisanayo kanye nezinhlelo zokuhlola.

1. Ukushisa okuphezulu kangakanani (40 ° C) kuthinta kanjani ama-molekyuli amancane nama-ion wensimbi?

Izinga lokushisa eliphakeme lisheshisa amanani okusabela, ngokujwayelekile akhulisa ukucekelwa phansi kwe-organic molecule kanye nokusiza izithako ezisebenzayo. Ekuhlolweni kokuqina kwemithi, 40 ° C \ 75% RH isetshenziswa njengesimo esisheshisiwe ukubikezela isimilo eside. Ukushisa okuphakeme kungakukhalisa i-oxidation, i-hydrolysis, ukomisa, noma isomerizakhe kuma-molekyuli amancane, futhi kungaguqula ukuxhumana kwensimbi kanye nokuLubitiyo.

1.1 Ithonya elithile kuma-molecule amancane

Ukuwohloka kwe-oxidative:Ama-Lipids noma ama-phenolics afunda ku-axisize ku-40 ° C, akha imikhiqizo yokucekelwa phansi.
I-Hydrolysis:Amabhondi e-Ester noma amide anamathela kalula lapho kufudumala, kuthela ama-acid, izisekelo, noma ama-alcohols.
Isomerization:Ukuguqulwa kwe-CIS-Trans noma ukuguga kunganciphisa umsebenzi.

Isibonelo: Rapamycin (kanye ne-IV Prodrug CCI-779) egcinwe ku-40 ° C \ 75% RH Ngakho-ke, okuqukethwe okusebenzayo kanye nama-defaraturature asemqoka kumele abhekwe eduze ngaphansi kwengcindezi yokushisa.

1.2 imiphumela ebalulekile kwizixazululo zensimbi-ion

Ukuqina okuyinkimbinkimbi:I-Metal-Ligand Equilibrium Contracts iyahlukahluka ngokushisa; Izinkambi ezibuthakathaka zingavimbela, zidedelisa ama-ion.
I-Solubity & Imvula:Ngenkathi usawoti omningi wensimbi uncibilikisa kakhulu ku-T, ezinye (isb. Calcium Carbonate, ngokwesibonelo, kwakha ama-hydrate ahlukene emazingeni okushisa ahlukene, athinta i-morphology eqondile.
I-Oxidation State Shifts:Feu²⁺ Can oxidize ku-Feud Feud Th anyuket t, ethambisa njenge-insoluble hydroxides kanye nokuguqula isixazululo sebhalansi ye-ion.

Ku-40 ° C, qapha ukuhlukaniswa okuyinkimbinkimbi kanye nengozi yemvula ukugwema ukulahleka okungahlosiwe kwe-ion noma ukushintshana.

1.3 Ukuqamba ukuhlolwa kokushisa okushisa okuphezulu nezindlela zokulinganisa

Amasu wokuhlaziya ajwayelekile afaka:

I-DSC (ukuskena kokuskena kwe-calorimetry):Izinyathelo zokuqina okushisayo, ukuguqulwa kwesigaba, nokubola kwezinkomba.
UV-Vis Spectrophototomotometry:Amathrekhi ukumunca noma ushintsho lombala ukuze ulinganise ukwakheka okusebenzayo noma okuwohlokayo ngokuhamba kwesikhathi.
ICP-MS \ AAS:Iqonde ngqo ukugxila kwensimbi-ion, ukuthola ukulahleka noma ukwelashwa kwangaphambi nangemva kokushisa.
I-HPLC \ GC-MS:Ihlukanisa futhi ikhombe imikhiqizo yokuwohloka, ukubala ukululama kwe-parent compound.

Isibonelo se-Protocol: Beka amasampula kumanzi angu-40 ° C amanzi okugeza ukuze asheshise ukuguga; Ngezikhathi ezithile run DSC Scans yezehlakalo ezishisayo, ukukala umuzwa we-UV-Vis, futhi usebenzise i-ICP-MS ukulandela amazinga we-metal-ion. Ngokubambisana lezi zindlela zinikeza umbono ophelele wezinguquko ezibangelwa ukushisa.

2

At -20 ° C, i-FreeZing Hlaziya izifundazwe ngokomzimba, ezibangela ukuhlukaniswa kwezakhi noma amashifu wokuqina. Amakristalu eqhwa awakhiphi amaphakethe angena emaphaketheni ama-UNDROZEN, akhanyisa ukugxila kwasendaweni kanye pH, okungabangela ukusabela okungalindelekile noma ama-precipitates. Imijikelezo ephindaphindwayo ye-freeze-thaw ingaphazamisa ukwakheka kwesampula nobuqotho.

2.1 Imiphumela ehambisanayo ye-freeze-thaw kuma-molecule amancane

Ngesikhathi se-freeze-thaw, ukugxila okugxile ezungeze amakristalu eqhwa, kuvame ukuhlanganisa kabusha noma kuhlanganisa ukuqina. I-macroscopicaty lokhu kuvela njenge-turbidity noma i-tyripitate; ukuhanjiswa kabusha kwemicroscopicat, ukuhanjiswa kwamangqamuzana noma ukulimala kwenzeka. Izifundo ku-DMSO-based Comple-based Comparies khombisa imijikelezo eminingi ye-freeze-thaw yehlisa ukugxila okusebenzayo (ngenxa yokuwohloka noma kwezulu) uma kuqhathaniswa nezilawuli ezingabizi. Amasistimu athambekele ekuhlukaniseni kwesigaba adinga ukulawulwa okuqinile komjikelezo nokuhlola izinyoka.

2.2 Izindlela ezisetshenziselwa i-Metal-Ion Solutions

Ukwakheka kwe-Ice kudlulela ngensimbi i-ion kanye nezithasiselo kuma-liquiful anderstices, ukukhulisa isikhashana i-H⁺ okuhlushwa. Nge-zero-valent iron (zvi), iqhwa-i-freeze-thaw igxila ama-protons ancibilikisa ungqimba lokuhamba; Kukhishwe izinsimbi (isb. Ukushintshwa okunjalo kwe-PH no-Ion kungaguqula i-Chemistry kanye nokubonwa, okuthinta ukuqina kwesisombululo.

2.3 Ukulinganisa Imithelela Yama-Freeze-Thaw

I-DLS (Ukusakazeka Kokukhanya Kwamandla):Amathrekhi usayizi wezinhlayiyana wezinhlayiyana
ICP-MS \ AAS:Ukuhlushwa kwensimbi-ion kuhluke ukwehlukahluka ngaphambi nangemva kokuqhakaza kwe-thaw ukuhlola ukulahleka noma kwezulu.
I-CRECYZE-SRECHING CELCLING:Landela imihlahlandlela ye-ICH (E.G., imijikelezo emithathu: -10 kuya - ° C for 2days, bese kuthi 40 ° C nge-2days) ngesampula ngemuva kokuhlola ukuqina.

Ngalezi zindlela, ama-labs angancamela imiphumela ye-freeze-thaw futhi andise ama-protocols okugcina \

3. Ukukala kanjani amazinga we-photodegradation we-compacts photossion?

Amakhompiyutha anezinhlelo ezihlanganisiwe ze-π-Systems, amasongo amnandi, noma izikhungo zensimbi amunca i-UV \ 1 PhotoDissoncuation, PhotoOxiation, noma ukusabela kwama-chain mahhala. Ukuqonda lezi zinqubo kubalulekile ekwakheni ukuhlolwa kokuqina kokuqina nokubikezela ama-photoproducts.

3.1 Yiziphi izinhlanganisela ezizwakalayo futhi ngani?

Amadayi anezinhlelo ezihlanganisiwe noma ama-metal-Coordination ALLOSTES ABUSHINTSHA KAKHULU ATHOLA KANYE NAMAKHAYA AMAHLELA NOMA AMABHODI, akha ama-radicals.
Amafutha aguqukayo ekukhishweni kwamakhambi angavimba noma athobe ngaphansi kwe-UV \ ukushisa.
Ama-Molecule aqukethe amabhondi abuthakathaka (isb., I-nitroso, i-peroxide) athambekele kakhulu kwi-photodegradation.
Noma yisiphi isakhiwo ngama-chromophores noma amabhondi anama-Photo-Cruvas angabhekana ne-photochemistry-ionization, ukwengeza, i-isomerization-kanye nezithelo eziguquliwe noma eziguquliwe.

3.2 Ukuhlolisisa okuhleliwe kwe-PhotoStation Design

Nge-ich Q1B:

Isigaba Esiphoqelelwe - Isigaba Sokonakaliso: Dala amasampula wokukhanya okunzima ukuze imephu wonke ama-defadature angaba khona.
Isigaba sokuqinisekisa: Faka umthamo okhanyayo ochaziwe ukuze uhlole ukuqina okungokwemvelo.
Amaphuzu asemqoka:
Light source: Simulated sunlight (D65\ ID65 fluorescent lamps, xenon‑arc, metal‑halide lamps) with cut‑off filters < 320 nm, or UVB\ UVA and visible light combinations.
Ukusetha isampula: Beka i-inert, iziqukathi ezisobala, isicaba sokuvezwa komfaniswano, ngokulawulwa okumnyama. Uma kwenzeka ukonakaliswa okusheshayo okusheshayo, isikhathi sokuvezwa \ ukuqina.
Ukuqapha kwethamo: Ukulinganisa i-Irradiance (E.G., ngeQunine Sulfate Solution) bese uqopha umthamo wokukhanya ku-J \ m² ukuqinisekisa ukuphindaphinda.

Ukulawulwa okuqinile nokuqhathanisa okumnyama

3.3 PhotodeGradation Kinetic Modeling

I-PhotodeGradation ivame ukulandela ama-kinetics we-oda lokuqala:

C (t) = c0e-KTC (t) = c_0 e ^ {- kt}

lapho k i-rate njalo. Ukusabela okungaphezulu kweminwe kungalingana nemodeli yeLangmuir-Hinshelwood. Ngokulandela ukugxila nge-UV-Vis noma i-HPLC-MS ngokuhamba kwesikhathi, k kungafakwa. Isivuno se-PhotoCHemical Quantum (φ) -Iminyezo -moreces iphendule nge-Photon emunca amandla - ibalwa ngokuqhathanisa isilinganiso sokuwohloka ngesigameko se-Photon Flux. Lawa mapharamitha anciphisa ukuqina kokukhanya.

4. Kunconywe izindlela zokuqina zokuqina

Hlanganisa amasu wokuhlaziya amaningi wephrofayili ephelele yokuqina:

I-High-T \ Freeze-Thaw:
- I-DSC yemicimbi eshisayo \ izinguquko zesigaba
- I-UV-vis ukuqapha ukugxilisa okusebenzayo noma kwe-ion
- I-ICP-MS \ AAS YOKUGCINA
- I-DLS yenhlawulo \ Ukuhlaziywa kokuhlangene
Ukusizakala:
- Ukulandelela ukulandelela kwe-UV-vis kinetic
- I-HPLC-MS yokuhlonza okungonakalisiwe kanye nokusalela okuseleyo
- Isivuno se-Quantum kanye nokubala okuqhubekayo ngokususelwa ku-calibrated light dose

Qinisekisa ukulawulwa okuqinile (ukugcinwa okumnyama, imithombo ekhanyayo ehlukahlukene), ukuphindaphinda, kanye nokwelashwa kwezibalo ukuqinisekisa imiphumela.

I-5. Isethulo esisebenzayo sedatha yokuqina

Ukuhambisa okutholakele ngokucacile, lungiselela:

Ukuhlushwa vs. time plots: Qhathanisa amazinga asebenzayo noma we-ion ngaphansi kwama-40 ° C vs. -20 ° C.
I-PhotodeGradation Kinetics Curves: Khombisa ukugxila noma ukumunca isikhathi se-vs. Isikhathi sokuvezwa
I-DSC Thermograms: Khombisa endo \ extotherms yokuguqulwa kwesigaba noma ukubola ngokushisa.
Imidwebo yenqubo: Faneltate freeze-thaw umjikelezo umthelela noma indawo yokugcina izinto zokuhamba.

Ukubuka okuhlelwe kahle ukusekela ukutolika nengxoxo.

Ukugcina

Izingcindezi ezahlukene zisebenza ngezindlela ezihlukile: Ukushisa okuphezulu kusheshisa ukuwohloka kwamakhemikhali (ikakhulukazi ama-balling ama-crystal ukukhishwa kwe-ice-crystal kanye nengcindezi yemishini, ikakhulukazi kuma-molecule we-conjugagated noma e-metal Ukugcinwa nokuthutha kufanele kuhambisane: Izinto ezibucayi ezikhanyayo ezitsheni ze-opaque, ezibucayi zokushisa ezindaweni ezilawulwa amazinga okushisa, kanye nezinhlelo ezibucayi zeqhwa ezindaweni ezibandayo eziqinisekisiwe noma ama-liquid-nitrogen ukusetha. Umsebenzi wesikhathi esizayo kufanele uhlole izingcindezi ezihlanganisiwe (isb.

Amanothi angeziwe

Amayunithi:Umthamo okhanyayo ku-J \ M² noma amahora a-Lux; isilinganiso K njalo ngosuku ⁻¹; isivuno se-quantum φ; okuqukethwe okusele njenge-%.
Izigaba Zasampula:Yenza ngokwezifiso ama-protocols ngesigaba ngasinye (API, i-Intermediates, Imvelo Yezemvelo, usawoti wensimbi) nezinhlelo zodwa ze-solvent ukuhlinzeka ngezincomo zokugcina ezihlosiwe.

Izikhombo: Kususelwa kuzinkombandlela ze-ICH Q1A \ Q1B, ozoqina u-Annex 10, kanye nezincwadi zamanje.

Okwedlule:

I-HPLC I-Organic-Phase-Spract Springo Hvbrane ukuqhathanisa nokukhethwa komhlahlandlela

Olandelayo:

Buyela ohlwini