脂肪乳氨基酸(17)葡萄糖(11%)注射液稳定性研究

目的为临床合理使用脂肪乳氨基酸(17)葡萄糖(11%)注射液(商品名卡文)提供依据。方法将卡文3个腔室液体混匀(样品S1);再分别添加电解质(氯化钾和氯化钠,样品S2),维生素(水溶性维生素及脂溶性维生素,样品S3),多种微量元素(样品S4),以及上述所有成分(样品S5)。分别于室温下放置0,4,8,12 h时测定混合液的pH、渗透压、不溶性微粒数,并考察乳剂粒径分布情况。结果样品S1-S5室温下放置12 h内外观无明显变化,pH为5.51~5.59;渗透压,S2为934~972 mOsmol/kg,S3为816~831 mOsmol/kg,S4为810~835 mOsmol/kg,S5为934~957 mOsmol/kg;不溶性微粒变化不明显;乳剂粒径分布集中在1~10 nm。结论在卡文中添加规定限度内的电解质、维生素和多种微量元素,对其pH、不溶性微粒、乳剂粒径等影响较小,但电解质对渗透压影响较大,应予以重视。

克罗恩病患者血清CCL11及I-FABP的表达水平与疾病活动指数的相关性研究

目的探究克罗恩病(CD)患者血清嗜酸性粒细胞趋化因子(CCL11)及肠脂肪酸结合蛋白(I-FABP)水平表达与疾病活动指数的相关性。方法选取2021年2月至2023年2月于上海市杨浦区中心医院就诊的98例CD患者进行研究(CD组),根据疾病活动指数(CDAI)评分将患者分为缓解期21例、轻度活动期31例、中度活动期28例和重度活动期18例,另选取同期健康者100例作为对照组,采用酶联免疫吸附法检测血清CCL11、I-FABP水平,采用Spearman法分析血清CCL11、I-FABP水平与CDAI评分的相关性,采用受试者工作特征曲线(ROC)分析血清CCL11、I-FABP水平对CD患者疾病活动度的评估价值。结果CD组患者的血清CCL11、I-FABP水平分别为(51.33±7.14)pg/mL、(64.85±11.56)ng/mL,明显高于对照组的(28.56±6.61)pg/mL、(31.38±10.35)ng/mL,差异均有统计学意义(P<0.05);缓解期、轻度、中度、重度活动期CD患者血清CCL11水平分别为(31.47±7.02)pg/mL、(45.52±7.08)pg/mL、(57.83±7.12)pg/mL、(74.41±7.43)pg/mL,I-FABP水平分别为(48.13±10.79)ng/mL、(59.97±11.32)ng/mL、(70.76±11.75)ng/mL、(83.58±12.58)ng/mL,缓解期、轻度活动期、中度活动期、重度活动期CD患者血清CCL11、I-FABP水平依次升高,差异均有统计学意义(P<0.05)。Spearman相关性分析结果显示,血清CCL11、I-FABP水平均与CDAI评分呈正相关(r=0.834、0.620,P<0.01);ROC分析结果显示,血清CCL11、I-FABP水平评估CD患者疾病活动度的AUC分别为0.882、0.889,敏感性为81.82%、80.52%,特异性为85.71%、85.71%。两者联合评估疾病活动度的AUC为0.938,显著高于单项检测(P<0.05),联合检测的敏感性和特异性为93.51%、85.71%。结论CD患者血清CCL11、I-FABP水平升高,与疾病活动指数密切相关,且两者联合评估CD患者疾病活动度具有较高效能。

Acetyl-11-keto-β-boswellic acid extracted from Boswellia serrata promotes Schwann cell proliferation and sciatic nerve function recovery

Frankincense can promote blood circulation. Acetyl-11-keto-β-boswellic acid （AKBA） is a small molecule with anti-inflammatory properties that is derived from Boswellia serrata. Here, we hypothesized that it may promote regeneration of injured sciatic nerve. To address this hypothesis, we established a rat model of sciatic nerve injury using a nerve clamping method. Rats were administered AKBA once every 2 days at doses of 1.5, 3, and 6 mg/kg by intraperitoneal injection for 30 days from the 1st day after injury. Sciatic nerve function was evaluated using the sciatic functional index. Degree of muscle atrophy was measured using the triceps surae muscle Cuadros index.Neuropathological changes were observed by hematoxylin-eosin staining. Western blot analysis was used to detect expression of phospho-extracellular signal-regulated kinase 1 and 2 （p-ERK1/2） in injured nerve. S100 immunoreactivity in injured nerve was detected by immunohistochemistry. In vivo experiments showed that 3 and 6 mg/kg AKBA significantly increased sciatic nerve index, Cuadros index of triceps muscle, p-ERK1/2 expression, and S100 immunoreactivity in injured sciatic nerve of sciatic nerve injury model rats. Furthermore,for in vitro experiments, Schwann cells were treated with AKBA at 0–20 μg/mL. Proliferation of Schwann cells was detected by Cell Counting Kit-8 colorimetry assay. The results showed that 2 μg/mL AKBA is the optimal therapeutic concentration. In addition, ERK phosphorylation levels increased following 2 μg/mL AKBA treatment. In the presence of the ERK1/2 inhibitor, PD98059 （2.5 μL/mL）, the AKBA-induced increase in p-ERK1/2 protein expression was partially abrogated. In conclusion, our study shows that AKBA promotes peripheral nerve regeneration with ERK protein phosphorylation playing a key role in this process.

UV-Vis Spectroscopy Study on Interaction between Microperoxidase-11 and Pr Ion Under Acid Rain Stress

Interaction between rare earth ion praseodymium (Pr(Ⅲ)) and MP11 with/without hydrogen ion (H +) in different media( aqueous, phosphate buffer, physiological condition) were studied by UV Vis spectroscopy. All the results indicate that Pr(Ⅲ) interacts with MP11, increasing the non planarity of porphyrin periphery, leading MP11 to form two conformations when titrated by Pr(Ⅲ). Excessive Pr(Ⅲ) acts as a contaminant in living organism. H + and Pr(Ⅲ) have antagonistic effect on MP11, suggesting that at suitable concentration under physiological conditions, Pr(Ⅲ) can be used as biomodulator in protecting plants from acid rain stress or in rehabilitating the harm.

Acetyl-11-keto-β-boswellic acid inhibits proliferation and induces apoptosis of gastric cancer cells through the phosphatase and tensin homolog/Akt/cyclooxygenase-2 signaling pathway

BACKGROUND Gastric cancer is one of the most common malignant tumors of the digestive system worldwide,posing a serious danger to human health.Cyclooxygenase(COX)-2 plays an important role in the carcinogenesis and progression of gastric cancer.Acetyl-11-keto-β-boswellic acid(AKBA)is a promising drug for cancer therapy,but its effects and mechanism of action on human gastric cancer remain unclear.AIM To evaluate whether the phosphatase and tensin homolog(PTEN)/Akt/COX-2 signaling pathway is involved in the anti-tumor effect of AKBA in gastric cancer.METHODS Human poorly differentiated BGC823 and moderately differentiated SGC7901 gastric cancer cells were routinely cultured in Roswell Park Memorial Institute 1640 medium supplemented with 10%fetal bovine serum and 1%penicillin/streptomycin.Gastric cancer cell proliferation was determined by methyl thiazolyl tetrazolium colorimetric assay.Apoptosis was measured by flow cytometry.Cell migration was assessed using the wound-healing assay.Expression of Bcl-2,Bax,proliferating cell nuclear antigen,PTEN,p-Akt,and COX-2 were detected by Western blot analysis.A xenograft nude mouse model of human gastric cancer was established to evaluate the anti-cancer effect of AKBA RESULTS AKBA significantly inhibited the proliferation of gastric cancer cells in a dose-and time-dependent manner,inhibited migration in a time-dependent manner,and induced apoptosis in a dose-dependent manner in vitro;it also inhibited tumor growth in vivo.AKBA up-regulated the expression of PTEN and Bax,and downregulated the expression of proliferating cell nuclear antigen,Bcl-2,p-Akt,and COX-2 in a dose-dependent manner.The PTEN inhibitor bpv(Hopic)reversed the high expression of PTEN and low expression of p-Akt and COX-2 that were induced by AKBA.The Akt inhibitor MK2206 combined with AKBA downregulated the expression of p-Akt and COX-2,and the combined effect was better than that of AKBA alone.CONCLUSION AKBA inhibits the proliferation and migration and promotes the apoptosis of gastric cancer cells through the PTEN/Akt/COX-2 signaling pathway.

EFFECT OF CIS-9, TRANS-11-CONJUGATED LINOLEIC ACID ON CELL CYCLE OF MAMMARY ADENOCARCINOMA CELLS(MCF-7)

Objective: To determine the effect of cis-9, trans-1 1-conjugated linoleic acid on the cell cycle of mammary cancer cells (MCF-7) and the possible mechanism of the inhibitory effect of c9,t11-CLA. Methods: Using cell culture and immunocytochemical techniques, we examined the cell growth, DNA synthesis, expression of PCNA, cyclin A, B1, D1, p16ink4a and p21cip/waf1 of MCF-7 cells at various c9,t11-CLA concentrations (25μM, 50μM, 100μM and 200μM), at 24h and 48h. 96% ethand was used as negative control. Results: The cell growth and DNA synthesis of MCF-7 cells were inhibited by c9,t11-CLA. After treatment with various doses of c9,t11-CLA mentioned above for 8 days, the inhibition frequency was 27.18%, 35.43%, 91.05%, and 92.86%, respectively. Inhibitory effect of c9,t11-CLA on DNA synthesis (except for 25μM, 24h) was demonstrated by significantly less incorporation of 3H-TdR than the negative control (P<0.05 and P<0.01). To further investigate the influence of the cell cycle progression, we found that c9,t11-CLA may arrest the cell cycle of MCF-7 cells. Immunocytochemical staining demonstrated that incubation with different concentration of c9,t11-CLA at various times significantly decreased the expression of PCNA, Cyclin A, B1, D1 in MCF-7 cells compared to the negative control (P<0.01), whereas the expression of p16ink4a and p21cip/waf1, cyclin-dependent kinases inhibitors (CDKI), were increased. Conclusions: The cell growth and proliferation of MCF-7 cells is inhibited by c9,t11-CLA via blocking cell cycle, accompanying reduced expression of cyclin A, B1, D1 and enhanced expression of CDKI (p16ink4a and p21cip/waf1).

Evaluation of the Dietary Reference Intakes for Japanese (2010 Edition): Recommended Protein, Pantothenic acid, Vitamin D, and Iron Intakes for Breast-Fed Infants Aged 6 - 11 Months

Objective: With regard to the 2010 edition of Dietary Reference Intakes for Japanese (DRIs-2010), we investigated whether the DRIs for two age groups, breast-fed infants aged 6-8 and 9-11 months, can be fulfilled for every nutrient in actual dietary practice. Design: We evaluated (1) whether the DRIs for all nutrients can be fulfilled in a formula with energy and protein exceeding their DRIs, (2) whether the DRIs for all nutrients can be fulfilled in a formula prepared in accordance with Japanese government-recommended weaning guidelines, and (3) what kinds of formulas can be prepared if the DRIs for all nutrients are fulfilled without referring to the weaning guidelines. Setting: Simulation of diet menu on the basis of published data in our university and survey of diet menu in a university hospital attached to a national medical school. Subjects: The three types of formulas were planned for ten days. Results: It was impossible to simultaneously fulfil the DRIs for 6 - 8-month-old infants concerning pantothenic acid, vitamin D, and iron and those for 9 - 11-month-old infants concerning these nutrients plus protein. Conclusion: According to the DRIs-2010, the DRI for all nutrients could not be fulfilled in an ingestible formula.

亚油酸含量对大豆11S球蛋白膜理化性质的影响

为探究成膜液和膜中脂质和蛋白之间的相互作用,研究了亚油酸含量(蛋白质量的0%、10%、20%、30%和40%)对11S球蛋白成膜液的黏度及膜的微观结构和理化性质的影响。共聚焦激光扫描显微镜图像显示,成膜液中油滴尺寸均随亚油酸含量增加而增大,干燥成膜后油滴尺寸进一步增大。扫描电子显微镜结果显示,添加亚油酸后光滑致密的蛋白膜上表面出现油滴聚集,而下表面变得粗糙,但未出现油滴。添加40%亚油酸后,膜的玻璃化转变温度、抗拉伸强度和水蒸气透过系数分别由53.50℃、12.67MPa和2.52×10^(-10)g/(m·Pa·s)降低至50.38℃、7.30 MPa和1.83×10^(-10)g/(m·Pa·s),而断裂延伸率由95.58%增加至198.15%。分子动力学模拟结果表明,11S球蛋白与亚油酸分子在200 ns内没有发生相互作用。添加亚油酸会导致11S球蛋白膜中离子键和二硫键比例下降,而疏水相互作用和非二硫键共价键比例增加。以上结果表明,添加亚油酸可以通过改变膜中蛋白间的化学相互作用,从而影响膜的理化性质。研究结果将为大豆蛋白乳液膜成膜机制的研究提供理论参考。

STUDIES ON CHIRAL THIOPHOSPHORIC ACIDS AND THEIR DERIVATIVES 11.——THE RESOLUTION OF O-METHYL O-PHENYL THIOPHOSPHORIC ACID AND ABSOLUTE CONFIGURATIONS OF ITS OPTICAL ISOMERS

Racemic O-methyl O-pheayl thiophosphoric acid 1 has been successfully resolved through its quinine and brucine salts in methanol solution by fractional crystallization. The absolute configurations of the optically active 1 have been established as (+)-R-1 and (-)-S-1 by chemical correlation.

Evaluation of the Anti-Inflammatory Activities of 5,8,11-<i>cis</i>-Eicosatrienoic Acid

The main eicosanoids inflammatory mediators, prostaglandins and leukotrienes, are both generated from arachidonic acid (AA;20:4 n-6). AA is a member of polyunsaturated fatty acids (PUFAs). Numerous studies have demonstrated that various contents of PUFAs can modulate the inflammatory responses. However, fewer studies have examined n-9PUFAs and their effects on the inflammatory responses. In the present study, the role of 5,8,11-cis-eicosatrienoic acid (ETrA;20:3 n-9, also called Mead acid) in the inflammatory responses has been investigated. The anti-inflammatory activities of ETrA were examined using an in vitro macrophage system and the inhibitory effect was confirmed by western blot analysis for iNOS and COX-2 expressions. The interactions between ETrA and COX-2 protein were simulated to produce a computer modeling protein-ligand complexes and the results suggest a possible mechanism for the effects of ETrA. In this study, we described a significant inhibition of the inflammatory activities initiated by ETrA. Since ETrA is a substance presented in the tissues of young animals, we therefore anticipate that ETrA can be utilized as a natural therapeutic supplement to inhibit inflammatory activities.

Genesis of H-ZSM-11 Acidity under Hydrogen and Water Vapor Treatment

1. Introduction Zeolites are widely used in acid heterogeneous catalysis [1, 2]. Due to the unique physical and chemical properties ofzeolites, they are widely used in commercial catalytic processes, such as fluidized catalytic cracking, hydrocracking, methanol conversion to gasoline or olefins, ethylbenzene production, xylene isomerization, aromatics hydrogenation [3-9]. Acidity, high thermal stability, and shape selectivity determine the use of zeolites as catalysts in reaction processes through acid mechanisms [ 10].

茯苓酸通过调节Nrf2/SLC7A11/GPX4信号通路抑制氧糖剥夺/复氧诱导的心肌细胞铁死亡

目的:探究茯苓酸通过调节核因子E2相关因子2(Nrf2)/溶质载体家族7成员11(SLC7A11)/谷胱甘肽过氧化物酶4(GPX4)信号通路抑制氧糖剥夺/复氧(OGD/R)诱导的心肌细胞铁死亡的机制。方法:体外培养大鼠心肌细胞H9c2,诱导建立细胞OGD/R模型后以0、1.0、2.5、5.0、10.0、20.0μmol/L茯苓酸处理24 h,通过细胞计数试剂盒-8(CCK-8)法检测各处理组细胞活力后筛选出合适的茯苓酸作用浓度。将H9c2细胞随机分为对照组、模型组、茯苓酸组、ML385组(Nrf2抑制剂组)、茯苓酸+ML385组,除对照组外其余各组建立细胞OGD/R模型后以茯苓酸、ML385分组处理,采用CCK-8法与流式细胞实验分别检测各组H9c2细胞活力、凋亡率;采用试剂盒检测各组H9c2细胞培养基上清中乳酸脱氢酶(LDH)、促炎因子[前列腺素E2(PGE2)、肿瘤坏死因子-α(TNF-α)]、抗炎因子白细胞介素(IL)-10水平及细胞抗氧化因子[过氧化氢酶(CAT)、谷胱甘肽(GSH)]、铁死亡相关指标[铁含量、丙二醛(MDA)]水平;采用免疫印迹实验检测各组H9c2细胞凋亡及Nrf2/SLC7A11/GPX4信号通路相关蛋白表达。结果:与对照组比较,模型组细胞凋亡率、LDH释放量、细胞培养基上清中PGE2及TNF-α水平、细胞铁含量、MDA水平及Bax、Caspase-3蛋白表达均升高(P<0.05),细胞活力、细胞培养基上清中IL-10水平、细胞CAT及GSH水平、Bcl-2及Nrf2、SLC7A11、GPX4蛋白表达降低(P<0.05)。与模型组比较,茯苓酸组细胞凋亡率、LDH释放量、细胞培养基上清中PGE2及TNF-α水平、细胞铁含量、MDA水平及Bax、Caspase-3蛋白表达均降低(P<0.05),细胞活力、细胞培养基上清中IL-10水平、细胞CAT及GSH水平、Bcl-2及Nrf2、SLC7A11、GPX4蛋白表达升高(P<0.05);ML385组细胞凋亡率、LDH释放量、细胞培养基上清中PGE2及TNF-α水平、细胞铁含量、MDA水平及Bax、Caspase-3蛋白表达均升高(P<0.05),细胞活力、细胞培养基上清中IL-10水平、细胞CAT及GSH水平、Bcl-2及Nrf2、SLC7A11、GPX4蛋白表达降低(P<0.05)。与茯苓酸组比较,茯苓酸+ML385组细胞凋亡率、LDH释放量、细胞培养基上清中PGE2及TNF-α水平、细胞铁含量、MDA水平及Bax、Caspase-3蛋白表达均升高(P<0.05),细胞活力、细胞培养基上清中IL-10水平、细胞CAT及GSH水平、Bcl-2及Nrf2、SLC7A11、GPX4蛋白表达降低(P<0.05)。结论:茯苓酸可通过激活Nrf2/SLC7A11/GPX4信号而抑制OGD/R诱导的心肌细胞炎症、脂质过氧化与铁死亡,增强其抗氧化活性及细胞活力,最终减轻其细胞凋亡损伤。

新型11-脱氧甘草次酸-30-酰胺衍生物的研究

目的合成新型的11-脱氧甘草次酸衍生物,寻找抗炎活性高的药物。方法用甘草次酸还原制得11-脱氧甘草次酸,再和R取代的苯基异唑衍生物偶联,合成了一系列新型11-脱氧甘草次酸-30-酰胺衍生物,用IR、1H-NM R1、3C-NM R、M S等分析方法进行结构确证,以苯甲酸引起的小鼠耳肿模型和醋酸引起的小鼠腹膜炎模型评价了抗炎活性。结果IR1、H-NM R1、3C-NM R、M S等数据表明这些化合物结构正确。其中Ⅰ、Ⅲ、Ⅴ和Ⅶ化合物具有明显的抗炎活性,某些甘草次酸-30-酰胺衍生物差异有统计学意义。结论合成的系列新化合物结构正确,具有明显的抗炎活性。

含HF体系中SAPO-11分子筛的合成与表征

在含HF体系中合成了SAPO-11分子筛,并采用X射线衍射、扫描电镜、低温氮物理吸附、红外光谱和吸附氨的程序升温脱附等手段对其进行了表征.结果表明,相对于常规无HF合成体系,在HF体系中合成的SAPO-11分子筛样品结晶度提高,结晶速度加快,分子筛单晶增大,分子筛晶粒聚集体的粒径减小,比表面积降低,孔体积与平均孔径增大.合成体系中加入HF后SAPO-11分子筛上B酸中心的总酸量和弱酸量降低,中强酸中心的比例有所提高,而L酸的酸量和酸强度无明显改变.

稀土对SAPO-11分子筛结构与性能的影响

分别采用浸渍法及离子交换法将稀土元素镧、铈引入SAPO-11分子筛,通过XRD、BET、孔分布、in-situ FTIR及NH3-TPD等表征手段考察了稀土对SAPO-11分子筛结构及表面性能的影响.结果表明,SAPO-11分子筛经稀土元素La、Ce改性后,分子筛摩尔组成改变、结晶度下降,其中La3+离子交换改性带来的变化最为明显.在分子筛表面聚集的稀土元素可作为Lewis酸中心,造成分子筛L酸含量增多,B/L比值下降;同时,由于三价稀土离子吸引电子的能力弱于Al3+,改性后催化剂的桥连羟基强度下降.经稀土改性后,催化剂总酸量下降.

甘草次酸、11-脱氧甘草次酸钠盐的制备及抗炎作用的研究

目的制备甘草次酸、11-脱氧甘草次酸的钠盐,并研究甘草次酸钠、11-脱氧甘草次酸钠的抗炎作用及其可能的机制。方法在无水乙醇条件下,与氢氧化钠反应分别得到相应的钠盐。并通过二甲苯致小鼠耳肿胀、纸片致小鼠慢性肉芽肿及气囊性滑膜炎3个模型观察甘草次酸钠、11-脱氧甘草次酸钠的抗炎作用,并测定小鼠血清和炎症液中前列腺素E2(PGE2)的含量和一氧化氮合酶(NOS)活性。结果所得钠盐通过熔点、红外、紫外等表征其结构。10、20、40 mg/kg的11-脱氧甘草次酸钠能明显抑制二甲苯致小鼠耳片肿胀,也可显著抑制滤纸片所致小鼠慢性肉芽肿,可使血清中PGE2含量减少。10、40 mg/kg的11-脱氧甘草次酸钠能使炎症液中的PGE2含量减少。在血清和炎症液中,10 mg/kg的11-脱氧甘草次酸钠可使NOS活性和NO的含量显著下降。结论甘草次酸、11-脱氧甘草次酸的钠盐从一定程度上提高了这类化合物的水溶性、吸收性,改善了相应的药理作用。其中11-脱氧甘草次酸钠有较好的抗炎活性。其机制可能与抑制PGE2和NO合成及抗脂质过氧化有关。

酸、盐处理对Pt/SAPO-11物化及其催化性能的影响

采用不同酸和盐浸渍处理SAPO-11分子筛,然后负载Pt制成改性的Pt/SAPO-11催化剂,用XRF、XRD、N_2吸附-脱附、SEM、NH_3-TPD和Py-IR对催化剂进行表征,分析其物理化学性能。结果表明,酸和盐处理没有破坏SAPO-11的骨架结构,还提高了催化剂的孔容、孔径、比表面积等性质,催化剂的酸性、酸量也明显发生了改变。在固定床反应器中,评价了改性的Pt/SAPO-11催化小桐子油一步加氢制异构烷烃性能;结合催化剂表征数据表明,颗粒粒径、比表面积、孔径、酸性和酸量影响催化剂的活性及产物分布。对比发现,经0.5 mol/L柠檬酸处理的Pt/SAPO-11催化剂孔径大小、酸性、B酸和L酸量分布合适,因此,一步加氢催化处理小桐子油性能优异;其中,生物航油组分(C_(8-16))的收率为32.47%,异构烷烃(C8-16)选择性为53.13%。

AlPO_4-11和SAPO_4-11分子筛的微波合成及结晶机理研究

以二异丙胺为模板剂,利用微波辐射法合成了AlPO4-11和SAPO4-11分子筛,考察了合成压力、HF用量对合成AlPO4-11分子筛的影响;利用X射线衍射和扫描电子显微镜对所合成分子筛的结晶度及晶体形貌进行了表征。实验结果表明,利用微波技术合成的具有AEL晶体结构的AlPO4-11和SAPO4-11分子筛结晶度高、晶粒均匀(为长约5μm的棒状晶体)。通过考察晶化时间对合成产物的影响发现,微波合成的AlPO4-11分子筛是由六方晶系的正磷酸铝发生晶相转化而来的。利用X射线能谱对合成的SAPO4-11分子筛表面硅原子的含量进行了测定,并结合吡啶吸附傅里叶变换红外光谱表征结果证实,SAPO4-11分子筛具有B酸和L酸两种酸性位,但由于合成产物表面硅原子含量较少,因此酸性位也较少。

毛细管气相色谱法测定乳脂中的cis-9,trans-11-共轭亚油酸

建立了测定乳脂中cis-9,trans-11-共轭亚油酸(CLA)的毛细管气相色谱方法。样品经正己烷-异丙醇提取、甲醇-甲醇钠甲酯化后,进行气相色谱分析;采用程序升温,以保留时间定性,外标法定量。采用该方法测得共轭亚油酸的回收率为100.26%,相对标准偏差(RSD)为1.9%(n=6),检测限为1 mg/L。该方法样品用量少,前处理简单,建立的实验条件准确可靠,不仅可以用来测定cis-9,trans-11-CLA的含量,而且对于乳制品中所含的其他脂肪酸的分析测定也具有指导意义。

HPLC法测定冠脉宁片(胶囊)中11-羰基-β-乙酰乳香酸及松香酸检查

目的 建立HPLC法测定冠脉宁片（胶囊）（乳香、没药、血竭等）中11-羰基-β-乙酰乳香酸和掺伪物松香中松香酸的含有量.方法 冠脉宁片（胶囊）和松香的乙醇提取物的分析采用Agilent TC-C18 （4.6 mm×150 mm,5 μm）色谱柱,以乙腈-0.1％甲酸（75∶25）为流动相;检测波长为251 nm（11-羰基-β-乙酰乳香酸）,241 nm（松香酸）.同时采用液-质联用方法对松香酸进一步确证.结果 松香酸的检出限为0.3 μg/mL;松香酸和11-羰基-β-乙酰乳香酸线性范围分别为3.036 ～ 303.6 μg/mL和3.068～306.8 μg,/mL; 11-羰基-β-乙酰乳香酸和松香酸回收率分别为98.16％和104.22％.结论 本研究建立的HPLC方法可用于冠脉宁片（胶囊）中11-羰基-β-乙酰乳香酸的测定及掺伪松香中松香酸的检查.