Uhlalutyo lwe-LCMS: Ukulandelela iiPhthalates kwi-Baijiu yaseTshayina

Kwiminyaka yakutshanje, ungcoliseko lwe-phthalate kwi-Chinese Baijiu (utywala baseTshayina) luye lwatsala ingqalelo yoluntu ngokuphindaphindiweyo njengengxaki yokhuseleko lokutya. Ezi khemikhali, ezinokufudukela etywaleni, zibeka umngcipheko kwimpilo yabantu. Phakathi kweendlela ezahlukeneyo zokuhlalutya, i-Liquid Chromatography-Mass Spectrometry (LCMS) iye yavela njengesixhobo esibalulekileyo sokulandelela ii-phthalate kwi-Chinese Baijiu, ngenxa yobuthathaka bayo obuphezulu kunye nokuchaneka kwayo.

Pii-hthalates: Izongezo ezingafunekiyo kwi-Baijiu yaseTshayina​

Ii-phthalates, okanye ii-phthalic acid esters (ii-PAE), zisetyenziswa kakhulu njengee-plasticizers. Kwi-Chinese Baijiu, zinokuvela kwezi zinto zilandelayo:

1. Ukufuduka kwezinto zokupakisha zeplastiki;
2. Ukudibana nemibhobho yeplastiki okanye izikhongozeli ngexesha lokuveliswa;
3. Ungcoliseko lwezithako kwindalo esingqongileyo;

Nangona ukusetyenziswa kwezixhobo zeplastiki xa zidibene ngqo ne-Chinese Baijiu kungavumelekanga yimithetho yesizwe, ukufuduka kwinqanaba elilandelelanayo kusaqhubeka kuyingxaki. Ukutya kakhulu ii-phthalates ixesha elide kunokuphazamisa inkqubo ye-endocrine, nto leyo enokuba nefuthe ekuphuhlisweni komntwana kunye nempilo yokuzala.

I-LCMS: Umphenyi weMolekyuli weePhthalates​

I-Liquid Chromatography-Mass Spectrometry (LCMS) idibanisa amandla aphezulu okwahlulahlula kwe-liquid chromatography kunye nobukhali obuphezulu be-mass spectrometry, okwenza ukuba ifaneleke ngakumbi ekuhlalutyeni ii-trace compounds kwi-matrices ezintsonkothileyo njenge-Chinese Baijiu. Iingenelo eziphambili ziquka:

• Uvakalelo oluphezulu: Ukufunyaniswa kwi-ng/mL okanye kumanqanaba aphantsi;
• Ukukhetha okuphezulu: Ukuchongwa ngokuchanekileyo kunye nokulinganiswa kwee-phthalates ezininzi;
• Ukusebenza kakuhle: Uhlalutyo lwangaxeshanye lweethagethi ezininzi kwinaliti enye;
• Amandla aqinileyo okulwa nokuphazamiseka: Inciphisa ngempumelelo iziphumo ze-matrix ezivela kwi-Baijiu yaseTshayina;

Ukuhamba komsebenzi we-LCMS wokufumanisa i-Phthalate kwi-Chinese Baijiu​

1. Ukulungiselela iSampuli​

·Ukuxuba okanye ukujova ngqo (kwiisampulu ezinoxinzelelo oluphantsi);

·Uxinzelelo lwe-nitrogen blow-down kunye nokutshintshiselana kwe-solvent;

1. Ulwahlulo lweChromatography yoLwalo​

Ukusebenzisa ikholamu ye-C18 reverse phase chromatography ene-methanol/water okanye i-acetonitrile/water njenge-mobile phase, i-gradient elution isetyenziselwa ukwahlula ii-plasticizers ezahlukeneyo. Iithagethi zokufumanisa eziqhelekileyo ziquka:

·I-Dimethyl phthalate (DMP)

·I-Diethyl phthalate (DEP)

·I-Dibutyl phthalate (DBP)

·Di (2-ethylhexyl) phthalate (DEHP)

1. Ukufunyanwa kweMass Spectrometry​

Fumana kwimo ye-ion engalunganga usebenzisa umthombo we-ion otshizayo ngombane (i-ESI) okanye umthombo we-ionization we-atmospheric pressure chemical (i-APCI). I-mass spectrometer iphucula ukukhetha kunye novakalelo lokufumanisa ngokusebenzisa imo yokujonga ukusabela okuninzi (i-MRM).

Ukuqinisekiswa kweNdlela kunye noLawulo loMgangatho​

Indlela ye-LCMS ethembekileyo ifuna ukuqinisekiswa okungqongqo:

• Uluhlu olucwangcisiweyo: Lugubungela uxinano olulindelekileyo nge-R² > 0.99；
• Umda wokufunyanwa/ukulinganiswa: Ngokwesiqhelo kumanqanaba e-sub-μg/L, ukuthobela imigangatho yolawulo；
• Ukuchaneka nokuchaneka: Amazinga okubuyisela amandla e-spike angama-85–115%, ukuphambuka okuqhelekileyo <15% ；
• Ukuchaneka: Kuqinisekisa ukuba iincopho ekujoliswe kuzo azinasiphazamiso;

Iimpendulo zoShishino kunye neSikhokelo saBathengi​

Ngenxa yokuqhubela phambili kwetekhnoloji yokufumanisa kunye nemithetho engqongqo, imboni yaseTshayina iBaijiu isebenzise amanyathelo okunciphisa iingozi ze-phthalate:

1. Ulawulo lomthombo: Ukususwa kancinci kancinci kwezinto zeplastiki kwimveliso；
2. Ulawulo lwenkqubo: Ukubeka esweni okuphuculweyo kunye nolawulo lwezinto zokwenza imveliso;
3. Uvavanyo lokuphela kwemveliso: Iinkqubo zokuhlola umgangatho ezingqongqo ；

Njengabathengi, singenza oku kulandelayo:

• Thenga kwiibhrendi ezidumileyo ngokusebenzisa iindlela ezisemthethweni；
• Jonga ukuthembeka kokupakishwa kwaye uphephe iimveliso ezonakeleyo;
• Gcina kakuhle, uphephe amaqondo obushushu aphezulu kunye nokugcinwa ixesha elide;

Iimbono zexesha elizayo​

I-LCMS iza kuqhubeka nokudlala indima ebalulekileyo ekufumaneni i-phthalate kwi-Baijiu yaseTshayina. Ukuphuculwa okuqhubekayo kobuchule bezixhobo kunye nokwenza ngcono indlela yokusebenza kuya kwenza ukuba kubekho uhlalutyo olukhawulezileyo noluchanekileyo. Uphuhliso lweendlela zokuhlola ezininzi luya kuqinisekisa ngakumbi umgangatho opheleleyo kunye nokuqinisekiswa kokhuseleko.

Do you have questions about Chinese Baijiu testing? We welcome discussions via email at international@bfrl.com.cn.