APPI ionization的問題,透過圖書和論文來找解法和答案更準確安心。 我們找到下列地圖、推薦、景點和餐廳等資訊懶人包

APPI ionization的問題,我們搜遍了碩博士論文和台灣出版的書籍,推薦Cappiello, Achille (EDT)寫的 Advances in LC-MS Instrumentation 可以從中找到所需的評價。

國立交通大學 應用化學系碩博士班 陳月枝所指導 廖國亨的 研究以大口徑玻璃毛細管為非接觸式電噴灑游離質譜法的取樣管及游離噴頭 (2020),提出APPI ionization關鍵因素是什麼,來自於大氣壓下游離質譜法、無接觸式大氣壓力下游離法、電噴灑游離質譜法。

而第二篇論文國立中山大學 化學系研究所 謝建台所指導 齊晟廷的 多重游離源結合液相層析質譜儀的開發 (2020),提出因為有 常態游離質譜法、液相層析質譜儀、火焰誘導大氣壓化學游離法、介電質放電游離法、金屬離子加合分析物的重點而找出了 APPI ionization的解答。

接下來讓我們看這些論文和書籍都說些什麼吧:

除了APPI ionization,大家也想知道這些:

Advances in LC-MS Instrumentation

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為了解決APPI ionization的問題,作者Cappiello, Achille (EDT) 這樣論述:

The different LC-MS techniques available today were developed to suit specific analytical needs and the application range covered by each one is wide, but still limited. GC amenable compounds can be all analyzed with a single GC-MS system whereas HPLC applications call for specific LC-MS instrumenta

l arrangements. ESI, APCI, APPI, and EI are ionization techniques that can be combined with different analyzers, in single or tandem configuration, to create the ultimate system for a certain application. Once approaching LC-MS for a specific need, the fast technical evolution and the variegated com

mercial offer can induce confusion in the potential user.The role of this book is to enlighten the state-of-the-art of LC-MS evolution through a series of contributions written by the people that brought major, recent innovations in the field. Each chapter will take into consideration the novelties,

the advantages and the possible applications covered by a particular technical solution. The book will also include new analytical methods that can provide benefits using the most recent innovations in LC-MS plus a certain number of key applications. - Contains contributions from major innovators i

n the field- Covers the latest developments in the field of LC-MS- Gives a clear outline on the advantages of various techniques and their applications

研究以大口徑玻璃毛細管為非接觸式電噴灑游離質譜法的取樣管及游離噴頭

為了解決APPI ionization的問題,作者廖國亨 這樣論述:

電噴灑游離質譜法已被廣泛地用於在大氣壓力下直接分析液體樣品,當液體樣品進樣到達游離噴頭的出口端時,便會產生電噴灑游離。通常電噴灑游離噴頭的內徑皆在100微米以下,較小的電噴灑游離噴頭內徑有助於樣品在噴頭尖端電荷地有效累積,輔助泰勒錐的形成與氣態離子的產生。然而,內徑較小的游離噴頭通常所費不貲。除此之外,傳統的游離噴頭需具有導電性能,即游離噴頭需為金屬或需要具有金屬塗層以利接上電壓。我們的研究團隊在之前已經證明非接觸式電噴灑游離噴頭不用被直接提供電壓,便可輔助分子量從小到大的分析物產生游離。也就是當游離噴頭被架設在非常靠近已施加高電壓的質譜入口端時,從游離噴頭尖端流析出的分析物可即時產生電噴灑

而並質譜偵測到。因此,如果能夠在不進行任何修飾的情況下,能夠將可拋棄式的、便宜、易於取得的大口徑,即內徑大於100微米的玻璃毛細管直接用作游離噴頭,將會很理想。玻璃毛細管也可以用作取樣管,當從玻璃毛細管的入口引入樣品溶液時,樣品溶液可以通過毛細作用從游離噴頭的出口端被游離。因此,本論文研究大口徑玻璃毛細管是否可以直接做為取樣管與游離噴頭的可能性,因此選用了兩種大口徑的玻璃毛細管做為非接觸式游離噴頭。即一根長度為3公分的玻璃毛細管且內外徑各為約135微米與340微米首先被選擇為游離噴頭。即將玻璃毛細管放置在質譜進樣口端的距離約0.3毫米左右,並打開質譜儀的高壓電源,從毛細管進樣口導入約2微升的樣

品溶液(溶劑為甲醇與去離子水,其體積比例為2),就能即時由質譜偵測到來自樣品溶液的離子訊號,線性流速估計為約每秒0.1公分左右,而離子訊號可持續約30秒。透過這種方法可以容易地分析如有機物小分子、胜肽和蛋白質在內的分析物。草殺淨的最低可偵測濃度為10 nM,而胜肽(FEERWWWW)和肌紅蛋白的最低可偵測濃度為50 nM。儘管分析物的最低可偵測濃度遠高於傳統的電噴灑游離質譜法,但此方法具有操作簡便和方法簡單的優點。此外,論文中也證明了此方法在定量分析的可行性。另一個口徑較大的玻璃毛細管採用長度為0.5公分,而內徑與外徑個別為約447微米與922微米也被用為游離噴頭。根據實驗結果顯示,要直接利用

這樣大口徑的游離噴頭產生電噴灑是不可能的。因此,論文中研究利用一根碳纖維穿入此大口徑毛細管中來輔助電噴灑的產生,也就是毛細管被放置在靠近質譜入口端約0.1毫米的位置,然後在玻璃毛細管導入約1微升的樣品溶液,便可以順利將樣品容易的分析物游離。此方法的線性流速約為每秒0.03公分左右,而離子訊號約持續15秒左右。此方法可以分析的樣品和最低可偵測濃度與較小口徑的毛細管類似,可分析包括有機小分子,胜肽和蛋白質在內的分析物。儘管分析物的最低可偵測濃度同樣比遠高於傳統的電噴灑游離質譜法,但將來應該可以使用碳纖維做為吸附劑可將目標物濃縮在碳纖維上,而進一步降低最低可偵測濃度,但還必須更多的努力才有辦法達到此

目標。

多重游離源結合液相層析質譜儀的開發

為了解決APPI ionization的問題,作者齊晟廷 這樣論述:

液相層析質譜法(Liquid Chromatography-Mass Spectrometer, LC-MS)是一個普遍用在未知物定量及定性的技術,具有高靈敏度、高再現性及低偵測極限等優點,LC-MS目前已廣泛運用在分析領域。本研究開發新式LC-MS介面,將火焰誘導大氣壓化學游離法(Flame-induced Atmospheric Pressure Chemical Ionization, FAPCI)和介電質放電游離法(Dielectric Barriers Discharge Ionization, DBDI) 結合,並連接至傳統的液相層析質譜游離源(ESI)上,本新式游離源具有ESI

、DBDI以及FAPCI這三個部分。研究首先使用葡萄糖及咖啡因對多重游離源及儀器參數進行最佳化,相較於單獨ESI模式,ESI+DBDI+FAPCI模式中咖啡因的訊號強度增加了約2倍。實驗中也針對不同極性的化合物(咖啡因、尼古丁、苯乙酮、正十六烷及正二十烷)進行分析。咖啡因的偵測極限(Limit of Detection, LOD)由0.25 ppb降至0.1 ppb,R2有0.9997;尼古丁的偵測極限雖沒有降低,但同樣濃度的峰下面積卻增加了兩倍,R2也有0.9981。第二部分的研究將鹽類溶液裝填至以不鏽鋼針放至火焰中燃燒,藉由火焰的高溫游離金屬離子,以便將金屬離子加合至氣相分析物上,得到高穩

定性且不易裂解的金屬加合分析物離子。實驗中針對不同的鹽類進行探討,包含鹼金族元素以及過渡元素。最後結合LC-MS,利用快速置換金屬鹽類溶液的特性,在不同分析時間產生不同的金屬離子,提供另一種具有選擇性的測樣方式。