用高表达EGFR细胞膜色谱-HPLC/MS联用快速筛选独活中抗EGFR活性成分

报道了用高表达表皮生长因子受体细胞膜色谱与高效液相色谱/质谱在线联用方法(EGFR/CMC-online-HPLC/MS)快速筛选发现中药独活中的活性成分.实验中,采用高表达EGFR的细胞膜制备色谱固定相,建立EGFR/细胞膜色谱(EGFR/CMC)模型,利用柱切换和固相萃取技术,将EGFR/CMC模型与高效液相色谱/质谱(HPLC/MS)在线联用,构成一种新的可同时"识别-鉴定"目标成分的二维色谱系统,并应用于快速筛选独活中具有抗EGFR活性的目标成分.结果发现独活中的蛇床子素具有与对照药物达沙替尼类似的色谱保留特性,能够作用于EGFR;同时MTT及Elisa分析实验证实蛇床子素对HEK293EGFR细胞增殖及EGFR表达均有抑制作用.本文建立的EGFR/CMC-online-HPLC/MS二维色谱方法,可以选择性地从中药复杂体系中快速"识别-鉴定"目标组分,且筛选结果与特定生物效应显著相关.     

Screening epidermal growth factor receptor antagonists from Radix et Rhizoma Asari by two‐dimensional liquid chromatography

Radix et Rhizoma Asari is a traditional Chinese medicine, and has many pharmacological effects, such as calming, analgesia, anti‐inflammation, antiarrhythmic, antihypertensive, antivirus, etc. But few studies have screened the active compounds from extracts of Radix et Rhizoma Asari for tumor therapy. In this study, a two‐dimensional liquid chromatography system was built to screen active compounds acting on epidermal growth factor receptor (EGFR) from Radix et Rhizoma Asari. The screening result showed that asarinin from Radix et Rhizoma Asari was the targeted component that could act on EGFR specificity. The competitive binding assay and molecular docking assay results showed asarinin binding with EGFR in similar manner as with gefitinib, which was used as a positive control drug. Then the antitumor effect of asarinin was studied through cell growth assay in vitro. The results showed that gefitinib and asarinin could inhibit highly expressed EGFR cell growth in a dose‐dependent manner in the range of dose from 0.10 to 102.4 μM. This two‐dimensional liquid chromatography system will be a useful method in drug discovery from natural medicinal herbs for searching potential antitumor candidates.     

Optimization for detection of flunarizine by high performance liquid chromatography/electrospray/mass spectrometry

This paper describes a newly developed high performance liquid chromatography/electrospray/mass spectrometry (HPLC/ES/MS) method for the determination of flunarizine (FZ) in artificial cerebrospinal fluid. The optimization for the detection of FZ in biological fluid by LC/ES/MS was investigated. The effects of solvent composition, the addition of modifier and flow rate on the detection of FZ by ES/MS were examined. The detection limit of this method (0.8 nM) proved to be much better than previously reported methods. Satisfactory accuracy (98.2–106.0%) of this newly developed method was obtained. The application of this method was demonstrated by analyzing FZ in rat microdialysis samples.     

An online coupled peritoneal macrophage/cell membrane chromatography and high‐performance liquid chromatography/mass spectrometry method to screen for anti‐inflammatory components from the Chinese traditional medicine Chloranthus multistachys Pei

Cell membrane chromatography (CMC) is a chromatographic biological affinity method that uses specific cell membranes as the stationary phase. In this study, a novel peritoneal macrophage/cell membrane chromatography (PM/CMC)–online‐high performance liquid chromatography/mass spectrometry (HPLC/MS) method was established to screen for the anti‐inflammatory components from traditional Chinese medicines using hydrocortisone and dexamethasone as standards. The stationary phase of the CMC employed mouse peritoneal macrophage cell membranes. This method was applied to the purification and identification of components in extracts of Chloranthus multistachys Pei. The major component retained by CMC was identified as isofraxidin by HPLC/MS. In vitro experiments revealed that IF was able to inhibit the production of nitric oxide and tumor necrosis factor‐α in lipopolysaccharide‐stimulated mice and peritoneal macrophages in a dose‐dependent manner. The results demonstrated that the PM/CMC‐online‐HPLC/MS is an effective screening system for the rapid detection, enrichment, and identification of target components from complex samples. Copyright © 2013 John Wiley & Sons, Ltd.     

Novel approaches in analysis of Fusarium mycotoxins in cereals employing ultra performance liquid chromatography coupled with high resolution mass spectrometry

Rapid, simple and cost-effective analytical methods with performance characteristics matching regulatory requirements are needed for effective control of occurrence of Fusarium toxins in cereals and cereal-based products to which they might be transferred during processing. Within this study, two alternative approaches enabling retrospective data analysis and identification of unknown signals in sample extracts have been implemented and validated for determination of 11 major Fusarium toxins. In both cases, ultra-high performance liquid chromatography (U-HPLC) coupled with high resolution mass spectrometry (HR MS) was employed. ¹³C isotopically labeled surrogates as well as matrix-matched standards were employed for quantification. As far as time of flight mass analyzer (TOF-MS) was a detection tool, the use of modified QuEChERS (quick easy cheap effective rugged and safe) sample preparation procedure, widely employed in multi-pesticides residue analysis, was shown as an optimal approach to obtain low detection limits. The second challenging alternative, enabling direct analysis of crude extract, was the use of mass analyzer based on Orbitrap technology. In addition to demonstration of full compliance of the new methods with Commission Regulation (EC) No. 401/2006, also their potential to be used for confirmatory purposes according to Commission Decision 2002/657/EC has been critically assessed.     

Screening anti‐tumor compounds from Ligusticum wallichii using cell membrane chromatography combined with high‐performance liquid chromatography and mass spectrometry

Tyrosine 367 Cysteine‐fibroblast growth factor receptor 4 cell membrane chromatography combined with high‐performance liquid chromatography and mass spectrometry was developed. Tyrosine 367 Cysteine‐HEK293 cells were used as the cell membrane stationary phase. The specificity and reproducibility of the cell membrane chromatography was evaluated using 1‐tert‐butyl‐3‐{2‐[4‐(diethylamino)butylamino]‐6‐(3,5‐dimethoxyphenyl)pyrido[2,3‐d]pyrimidin‐7‐yl}urea, nimodipine and dexamethasone acetate. Then, anti‐tumor components acting on Tyrosine 367 Cysteine‐fibroblast growth factor receptor 4 were screened and identified from extracts of Ligusticum wallichii. Components from the extract were retained on the cell membrane chromatographic column. The retained fraction was directly eluted into high‐performance liquid chromatography with mass spectrometry system for separation and identification. Finally, Levistolide A was identified as an active component from Ligusticum wallichii extracts. The 3‐(4,5‐dimethylthiazol‐2‐yl)‐2,5‐diphenyl‐tetrazolium bromide‐formazan colorimetric assay revealed that Levistolide A inhibits proliferation of overexpressing the mutated receptor cells with dose‐dependent manner. Phosphorylation of fibroblast growth factor receptor 4 was also decrease under Levistolide A treatment. Flex dock simulation verified that Levistolide A could bind with the tyrosine kinase domain of fibroblast growth factor receptor 4. Therefore, Levistolide A screened by the cell membrane chromatography combined with high‐performance liquid chromatography and mass spectrometry can arrest cell growth. In conclusion, the two‐dimensional high‐performance liquid chromatography method can screen and identify potential anti‐tumor ingredients that specifically act on the tyrosine kinase domain of the mutated fibroblast growth factor receptor 4.     

Screening antiallergic components from Carthamus tinctorius using rat basophilic leukemia 2H3 cell membrane chromatography combined with high‐performance liquid chromatography and tandem mass spectrometry

Carthamus tinctorius, used in traditional Chinese medicine, has many pharmacological effects, such as anticoagulant effects, antioxidant effects, antiaging effects, regulation of gene expression, and antitumor effects. However, there is no report on the antiallergic effects of the components in C. tinctorius. In the present study, we investigated the antiallergic components of C. tinctorius and its mechanism of action. A rat basophilic leukemia 2H3/cell membrane chromatography coupled online with high‐performance liquid chromatography and tandem mass spectrometry method was developed to screen antiallergic components from C. tinctorius. The screening results showed that Hydroxysafflor yellow A, from C. tinctorius, was the targeted component that retained on the rat basophilic leukemia 2H3/cell membrane chromatography column. We measured the amount of β‐hexosaminidase and histamine released in mast cells and the key markers of degranulation. The release assays showed that Hydroxysafflor yellow A could attenuate the immunoglobulin E induced release of allergic cytokines without affecting cell viability from 1.0 to 50.0 μM. In conclusion, the established rat basophilic leukemia 2H3 cell membrane chromatography coupled with online high‐performance liquid chromatography and tandem mass spectrometry method successfully screened and identified Hydroxysafflor yellow A from C. tinctorius as a potential antiallergic component. Pharmacological analysis elucidated that Hydroxysafflor yellow A is an effective natural component for inhibiting immunoglobulin E–antigen‐mediated degranulation.     

Simultaneous determination of sex hormones in egg products by ZnCl2 depositing lipid, solid-phase extraction and ultra performance liquid chromatography/electrospray ionization tandem mass spectrometry

A method was developed for simultaneous determination of residues of 17 sex hormones in egg products. Target compounds were extracted from samples with methanol in an ultrasonic bath, effectively separated from lipids in the extracts by ZnCl₂ depositing filtration and purified using a C₁₈ solid-phase extraction (SPE) and followed by NH₂ SPE cartridge. The analytes were quantified by liquid chromatography using a BEH C₁₈ column coupled to an electrospray ionization tandem mass spectrometer (LC-ESI-MS/MS) operating in negative mode for estrogens and in positive multiple reaction monitoring mode for androgens. The parameters of the mass spectrometer and the composition of mobile phase and additives were also optimized to enhance detection sensitivity. Average recoveries of the target compounds varied from 70.0% to 121.0% with relative standard deviations ranging from 2.3% to 11.2% at two fortification levels. The limits of detection (LOD) of the method were from 0.002 μg kg⁻¹ to 0.23 μg kg⁻¹ and the limits of quantification (LOQ) were in the range of 0.007-0.76 μg kg⁻¹.     

32种氧化型染料的高效液相色谱定量及高效液相色谱-串联质谱确证方法北大核心CSCD

染发类产品中氧化型染料种类多,实际样品测定时干扰多,建立染发类产品中多种常用染料的测定方法,为该类产品的有效监管提供技术手段十分必要。该研究根据染料使用频率分组,采用能够屏蔽硅羟基和金属离子影响的C_(18)柱,优化了《化妆品安全技术规范》(2015年版)中32种染料的高效液相色谱法(HPLC)并建立了高效液相色谱-串联质谱(HPLC-MS/MS)确证方法。样品以10 g/L亚硫酸氢钠水溶液为抗氧化剂,用无水乙醇-水(1∶1,v/v)混合溶液冰浴超声提取10 min。HPLC方法采用甲醇、乙腈和磷酸盐缓冲液为流动相分两个液相色谱条件进行梯度洗脱分离,于280 nm波长下检测,其中一个HPLC条件中的相互干扰组分均在另一个HPLC条件下完全分离,避免了实际样品检测时组分间的干扰,并排除了32种以外的其他15种常用染料的干扰。HPLC-MS/MS方法分别采用5 mmol/L乙酸铵水溶液-乙腈和5 mmol/L乙酸水溶液-乙腈为正离子和负离子模式下的流动相,电喷雾离子模式下用多反应监测(MRM)模式进行定性和定量分析。HPLC和HPLC-MS/MS两个方法中,日内精密度和48 h内稳定性的相对标准偏差(RSD)<10%,回收率为82.6%~114.9%(RSD<10%)。HPLC方法中32种染料在大约10~500 mg/L范围内线性关系良好(r^(2)>0.99),检出限为9.7~40.1μg/g;HPLC-MS/MS方法中氢醌线性范围为2.0~79.7 mg/L,检出限为8.0μg/g,其他组分线性范围约为0.1~4 mg/L,检出限为0.01~0.4μg/g。采用HPLC、HPLC-MS/MS两个方法和《化妆品安全技术规范》方法同时测定实际样品,共检出16种染料,检出含量范围为58~25160μg/g。3个方法检测结果的RSD为1.9%~10.1%。该研究增加了HPLC-MS/MS确证方法,适应化妆品法定检验中的未知物确认程序;方法简便快速,结果准确,专属性强,具有较好的通用性和可操作性。     

Analysis of allergens in tubeimu saponin extracts by using rat basophilic leukemia 2H3 cell‐based affinity chromatography coupled to liquid chromatography and mass spectrometry

An affinity two‐dimensional chromatography method was developed for the recognition, separation, and identification of allergic components from tubeimu saponin extracts, a preparation often injected to treat various conditions as indicated by traditional Chinese medicine. Rat basophilic leukemia‐2H3 cell membranes were used as the stationary phase of a membrane affinity chromatography column to capture components with affinity for mast cells that could be involved in a degranulation reaction. The retained components were enriched and analyzed by membrane affinity chromatography with liquid chromatography and mass spectrometry via a port switch valve. Suitability and reliability of the method was investigated using appropriate standards, and then, the method was applied to identify components retained from tubeimu saponin extracts. Tubeimoside A was identified in this way as a potential allergen, and degranulation assays confirmed that tubeimoside A induces RBL‐2H3 cell degranulation in a dose‐dependent manner. An increase in Ca²⁺ influx indicated that degranulation induced by tubeimoside A is likely Ca²⁺ dependent. Coupled with the degranulation assay, RBL‐2H3 cell‐based affinity chromatography coupled with liquid chromatography and mass spectrometry is an effective method for screening and identifying allergic components from tubeimu saponin extracts.     

高效液相色谱-串联质谱法测定动物源食品中粘杆菌素、多粘菌素B的残留量

建立了动物源食品中粘杆菌素和多粘菌素B残留的高效液相色谱-串联质谱(HPLC-MS/MS)测定方法。样品用V(10%三氯乙酸水溶液):V(乙腈)=30:70提取,Oasis WCX SPE柱净化,LC-MS/MS电喷雾正离子多反应监测模式(ESI+-MRM)检测。分析物在0～250μg/kg的浓度范围内呈良好线性,线性相关系数>0.995。方法的定量限为10μg/kg。方法在三个添加水平的平均回收率在71.6%～78.9%之间,相对标准偏差在6.2%～12%之间。方法适用于动物源食品中粘杆菌素和多粘菌素B的定量及确证检测。     

Diagnostic filtering to screen polycyclic polyprenylated acylphloroglucinols from Garcinia oblongifolia by ultrahigh performance liquid chromatography coupled with ion mobility quadrupole time-of-flight mass spectrometry

A novel multistage MS approach, insource collision-induced dissociation (CID) combined with Time Aligned Parallel (TAP) fragmentation, was established to study the fragmentation behavior of polycyclic polyprenylated acylphloroglucinols (PPAPs), which could provide a more reliable fragmentation relationship between precursor and daughter ions. The diagnostic ions for different subtypes of PPAPs and their fragmentation behaviors have been summarized. Moreover, a new and reliable multidimensional analytical workflow that combines ultrahigh performance liquid chromatography (UHPLC), data-independent mass spectrometry (MS^E), and tandem MS with ion mobility (IM) has been optimized and established for the analysis of PPAPs in the plant Garcinia oblongifolia by diagnostic filtering. Diagnostic fragment ions were used to selectively screen PPAPs from extracts, whereas IM coupled to MS was used to maximize the peak capacity. Under the optimized UHPLC-IM-MS^E and UHPLC-IM-MS/MS method, 140 PPAPs were detected from the crude extract of G. oblongifolia, and 10 of them were unambiguously identified by comparing them to the reference compounds. Among those PPAPs, 7 pairs of coeluting isobaric PPAPs that were indistinguishable by conventional UHPLC-HRMS alone, were further resolved using UHPLC-IM-MS. It is anticipated that the proposed method will be extended to the rapid screening and characterization of the other targeted or untargeted compounds, especially these coeluting isomers in complex samples.     

超高效液相色谱-四极杆-飞行时间质谱法快速筛查血液中10种常见毒物

建立了超高效液相色谱-四极杆-飞行时间串联质谱(UPLC-Q-TOF/MS)快速筛查血液中10种毒物的检测方法。用乙酸乙酯提取血液样品,浓缩至近干后,用甲醇溶解定容,过0.22 μ m滤膜后,直接测定。目标物经ACQUITY UPLC@BEH C18 色谱柱(100 mm×2.1 mm, 1.7 μ m)分离,以甲醇和0.1%(v/v)甲酸水溶液为流动相,梯度洗脱,四极杆飞行时间串联质谱电喷雾正离子模式检测,外标法定量。结果表明:目标物在10.0~500.0 μ g/L范围内线性关系良好,相关系数为0.9908~0.9958,检出限和定量限分别为1.0~2.0 μ g/L和4.0~8.0 μ g/L。在20.0、50.0和200.0 μ g/L 3个添加水平下的平均回收率为56.7%~83.0%, 相对标准偏差为3.6%~8.9%。利用Agilent Mass Hunter PCDL Manager软件建立常见毒物的数据库,并应用于加标样品的筛查分析。该方法能快速筛查出添加的10种常见毒物,检出率达100%,且保留时间偏差均小于0.1 min,质量偏差均小于1 mDa,同位素丰度匹配得分、同位素间距得分和MS匹配得分均大于90, MS/MS图谱匹配得分均大于70。该方法可用于法庭与临床毒物分析。     

化妆品中8种呋喃香豆素的高效液相色谱法检测及质谱确证

建立了同时测定化妆品中8种呋喃香豆素类化合物(8-羟基补骨脂素、补骨脂素、异补骨脂素、8-甲氧基补骨脂素、5-甲氧基补骨脂素、三甲沙林、欧前胡素和异欧前胡素)的高效液相色谱分析方法及液相色谱-串联质谱确证方法。膏霜类、水剂类、香波类、散粉类、唇膏类等不同类型的化妆品样品分别经适宜的提取溶液进行超声提取,提取液以离心处理后,取上清液经微孔滤膜过滤后测定。采用Agilent Zorbax SB-Phenyl色谱柱(250 mm×4.6 mm, 5 μm)分离,以甲醇-乙腈-水三元流动相梯度洗脱,流速1.0 mL/min,柱温30 ℃,检测波长250 nm。8-羟基补骨脂素的定量限为0.25 mg/kg,补骨脂素、异补骨脂素、8-甲氧基补骨脂素、5-甲氧基补骨脂素、三甲沙林、欧前胡素、异欧前胡素的定量限为0.5 mg/kg。在低、中、高3种加标水平下,8种待测组分的平均回收率为85.0%～105.8%,相对标准偏差为0.41%～7.90%。采用本方法在一日内不同时间点(6个时间点,每隔1 h测定一次)和不同日期(6 d内)测定混合标准溶液,得到8个目标物峰面积的日内精密度均小于1%,日间精密度均小于2%。该方法准确、简便、快速,适用于不同类型化妆品中8种呋喃香豆素类化合物的测定。     

Simultaneous screening of four epidermal growth factor receptor antagonists from Curcuma longa via cell membrane chromatography online coupled with HPLC–MS

The epidermal growth factor receptors (EGFRs) are significant targets for screening active compounds. In this work, an analytical method was established for rapid screening, separation, and identification of EGFRs antagonists from Curcuma longa. Human embryonic kidney 293 cells with a steadily high expression of EGFRs were used to prepare the cell membrane stationary phase in a cell membrane chromatography model for screening active compounds. Separation and identification of the retention chromatographic peaks was achieved by HPLC–MS. The active sites, docking extents and inhibitory effects of the active compounds were also demonstrated. The screening result found that ar‐turmerone, curcumin, demethoxycurcumin, and bisdemethoxycurcumin from Curcuma longa could be active components in a similar manner to gefitinib. Biological trials showed that all of four compounds can inhibit EGFRs protein secretion and cell growth in a dose‐dependent manner, and downregulate the phosphorylation of EGFRs. This analytical method demonstrated fast and effective characteristics for screening, separation and identification of the active compounds from a complex system and should be useful for drug discovery with natural medicinal herbs.     

成骨细胞膜色谱/超高效液相色谱-飞行时间质谱法快速筛选六味地黄汤抗骨质疏松活性成分

采用成骨细胞建立了细胞膜色谱/超高效液相色谱-飞行时间质谱（CMC/UPLC-TOF/MS）的分析方法。该法可快速筛选中药方剂六味地黄汤中潜在的抗骨质疏松活性成分，通过细胞试验和斑马鱼骨质疏松模型试验验证了筛选结果梓醇的体内外药效作用。以六味地黄汤水提物（90 g/L）为样品，通过CMC/UPLC-TOF/MS分析，快速鉴别细胞膜色谱柱保留成分群，高选择性获取六味地黄汤中16种潜在活性成分。该文以前沿色谱法分析梓醇、丹皮酚、齐墩果酸与细胞膜色谱固定相的亲和强度，选择亲和强度和含量较高的梓醇进行体内外药效验证，发现梓醇在对小鼠成骨细胞有显著促生长作用，能提高骨质疏松斑马鱼头部骨矿化面积。CMC/UPLC-TOF/MS筛选方法能在复杂中药方剂中快速得到抗骨质疏松活性成分，具有操作简便、快速、高效灵敏的优势。     

Rapid screening for anthocyanins and anthocyanin dimers in crude grape extracts by high performance liquid chromatography coupled with diode array detection and tandem mass spectrometry

A rapid and efficient method using high performance liquid chromatography coupled with diode array detection and tandem mass spectrometry (HPLC-DAD–MS/MS) for fast screening large numbers of anthocyanins and anthocyanin dimers in different grape skin extracts, without further sample clean-up procedures, was developed. A good separation of most detected anthocyanins was achieved in a run time of 15 min. Identification of anthocyanin pigments required a combination of several information: UV–vis spectra, MS and MS/MS spectra, and elution pattern. Many compounds have been here detected for the first time and their structures tentatively elucidated.     

Activity ranking of synthetic analogs targeting vascular endothelial growth factor receptor 2 by an integrated cell membrane chromatography system

Evaluating the biological activities of small molecules represents an important part of the drug discovery process. Cell membrane chromatography (CMC) is a well‐developed biological chromatographic technique. In this study, we have developed combined SMMC‐7721/CMC and HepG2/CMC with high‐performance liquid chromatography and time‐of‐flight mass spectrometry to establish an integrated screening platform. These systems was subsequently validated and used for evaluating the activity of quinazoline compounds, which were designed and synthesized to target vascular endothelial growth factor receptor 2. The inhibitory activities of these compounds towards this receptor were also tested using a classical caliper mobility shift assay. The results revealed a significant correlation between these two methods (R² = 0.9565 or 0.9420) for evaluating the activities of these compounds. Compared with traditional methods of evaluating the activities analogous compounds, this integrated cell membrane chromatography screening system took less time and was more cost effective, indicating that it could be used as a practical method in drug discovery.     

高效液相色谱-电喷雾串联质谱法测定饲料中的N-氨基甲酰-L-谷氨酸

建立了高效液相色谱-电喷雾串联质谱(HPLC-ESI-MS/MS)测定饲料中N-氨基甲酰-L-谷氨酸(NCG)含量的方法。饲料样品经甲醇提取、混合型强阴离子交换反相固相萃取(PXA)柱净化、HPLC分离后,采用ESI-MS/MS在正离子多反应监测(MRM)模式下进行检测,以碎片离子m/z 148.0和m/z 84.0进行定性,以碎片离子m/z 130.0进行定量。NCG的检出限(S/N >3)为24 μg/kg,定量限(S/N >10)为80 μg/kg,在20~1000 μg/L的质量浓度范围内峰面积与含量的线性关系良好,相关系数为0.9999。对饲料中NCG在80、200、500 mg/kg等3个添加水平下的回收率进行了测定,分别为104.0%、103.5%、95.3%,相对标准偏差分别为7.5%、6.3%、5.8%。结果表明,该方法操作简单,净化效果好,快速,灵敏度和准确度高,符合对饲料样品中NCG检测分析的要求。     

Qualitative and quantitative analysis of polycyclic polyprenylated acylphloroglucinols from Garcinia species using ultra performance liquid chromatography coupled with electrospray ionization quadrupole time-of-flight tandem mass spectrometry

Polycyclic polyprenylated acylphloroglucinols (PPAPs) are a group of natural products isolated from different Garcinia species with a wide range of important biological activities. In this study, an ultra performance liquid chromatography (UPLC) coupled to photodiode-array detection and quadrupole time-of-flight mass spectrometry (Q-TOF) method was developed to characterize 16 PPAPs in 10 Garcinia species. In source dissociation techniques based on cone voltage fragmentation were used to fragment the deprotonated molecules and multiple mass spectrometry (MS/MS) using ramping collision energy were used to further break down the resulting product ions. The resulting characteristic fragment ions were generated by cleavage of C1-C5 bond and C7-C8 bond through concerted pericyclic reaction, which is especially valuable for differentiating three types of PPAPs isomers. As such, two new PPAPs isomers present in minor amount in the extracts of Garcinia oblongifolia were tentatively characterized by comparing their tandem mass spectra to the known ones. In addition, an UPLC-Q-TOF-MS method was validated for the quantitative determination of PPAPs. The method exhibited limits of detection from 2.7 to 21.4 ng mL⁻¹ and intra-day and inter-day variations were less than 3.7% and the recovery was in the range of 89-107% with RSD less than 9.0%. This UPLC-Q-TOF-MS method has successfully been applied to quantify 16 PPAPs in 32 samples of 10 Garcinia species, which were found to be a rich source of PPAPs.