流式分析儀因其可對單顆粒樣品進(jìn)行高通量多參數(shù)分析,已廣泛應(yīng)用于當(dāng)前備受關(guān)注的小顆粒樣品分析工作中。當(dāng)前市場流式細(xì)胞儀品類繁多,那么又該如何選擇更加適合自己研究項目,特別是適合臨床級實驗高可靠性要求的流式分析方案呢?
近日來自丹麥奧爾堡大學(xué)臨床醫(yī)學(xué)系和其醫(yī)院臨床生化系的Jaco Botha等研究人員,使用包括英國Apogee Flow公司超靈敏高分辨率納米流式分析儀A60 Micro-PLUS在內(nèi)三種不同的流式分析儀系統(tǒng)進(jìn)行外泌體微囊泡(EVs)可靠性比較分析,包括大小分析定量,熒光標(biāo)記分析,濃度測定重復(fù)性及大量樣品重復(fù)檢測穩(wěn)定性等[1],為不同應(yīng)用場景和不同分析需求,選擇最佳分析方案提供了堅實的參考信息。
Apogee超靈敏納米流式分析儀,專為小顆粒分析優(yōu)化設(shè)計,在EVs等小顆粒分析應(yīng)用工作中,參與發(fā)表數(shù)百篇文章,充分體現(xiàn)其靈敏度,穩(wěn)定性和可靠性等性能出眾,備受認(rèn)可。
Jaco Botha等人的研究成果,大量直接對比數(shù)據(jù)再次體現(xiàn)出Apogee超靈敏納米流式分析儀:
》》分析<300nm Silica標(biāo)準(zhǔn)微球(相對Polystyrene材質(zhì),Silica材質(zhì)折射率更加接近EVs樣品折射率), 散射光性能更加出眾可靠(圖1):可檢測出更小的顆粒,更準(zhǔn)確的濃度
》》分析不同大小不同材質(zhì)納米級標(biāo)準(zhǔn)微球,計數(shù)穩(wěn)定性表現(xiàn)更為突出(圖2):更低的CV數(shù)值
》》分析熒光標(biāo)記EVs樣品,同一天/不同天不同批次樣品之間,大量樣品不同批次總體分析之間,系統(tǒng)分析穩(wěn)定性同樣更為可靠(圖3):更低的變異系數(shù)
圖1,不同流式分析技術(shù)散射光分析不同大小,不同材質(zhì)標(biāo)準(zhǔn)微球可靠性比較
圖2,不同流式分析技術(shù)分析不同大小Silica標(biāo)準(zhǔn)微球計數(shù)穩(wěn)定性性比較
圖3,不同流式分析技術(shù)分析不同大小Silica標(biāo)準(zhǔn)微球計數(shù)穩(wěn)定性性比較
部分節(jié)選內(nèi)容參考如下:
“In line with observations for LoD and LoQ, Apogee A60 Micro-PLUS tended to be more sensitive in detecting small silica nanospheres, scattering very small amounts of light than all other platforms, followed by ImageStream X Mk II and, lastly, FACS Aria III. For larger silica nanospheres, all platforms performed similarly. Finally, results for fluorescent polystyrene nanospheres reflected those for silica nanospheres, where Apogee A60 Micro-PLUS performed better than other platforms in detecting small nanospheres”
“In summary, the Apogee A60 Micro-PLUS demonstrated the overall lowest variabilities in EV concentration determinations, and global and inter-day variabilities did not differ much from intra-day variabilities. The FACS Aria III performed similarly and ex- hibited somewhat increased variabilities in EV concentration determinations compared to the Apogee A60 Micro-PLUS. Finally, although the average concentrations of EV phe- notypes did not differ between analysis days on the ImageStream X Mk II, it presented with the highest intra-day and global variabilities in EV concentrations across EV samples and phenotypes”
更多其他相關(guān)內(nèi)容,可參考文章全文。
參考資料
1. Botha J, Pugsley H R, Handberg A. Conventional, High-Resolution and Imaging Flow Cytometry: Benchmarking Performance in Characterisation of Extracellular Vesicles[J]. Biomedicines, 2021, 9(2): 124.
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