[Determination of carboxyatractyloside and atractyloside in Xanthii Fructus by HPLC].

OBJECTIVE: To determine carboxyatractyloside and atractyloside in Xanthii Fructus by HPLC. METHOD: By HPLC, Agilent ZORBAX SB-phenyl (4.6 mm x 250 mm, 5 microm) column was adopted, with acetonitrile-0.01 mol x L(-1) NaH2PO4 (pH 6) as the mobile phase for gradient elution at the flow rate of 1.0 mL x min(-1). The detection wavelength was 203 nm, and the temperature was set at 35 degrees C. RESULT: Carboxyatractyloside showed a good linearity within the range of 0.0972-1.944 microg and atractyloside showed a good linearity within the range of 0.1030-2.060 microg. The recovery rate of carboxyatractyloside was 100. 3% and that of atractyloside was 102.5%. The RSD were 0.67% and 1.4% (n=6). CONCLUSION: This method is so simple, practical and highly repeatable that is can be used for quality control of Xanthii Fructus.

Chemometrics coupled with UPLC-MS/MS for simultaneous analysis of markers in the raw and processed Fructus Xanthii, and application to optimization of processing method by BBD design.

BACKGROUND: As a widely used toxic traditional herbal medicine, the quality of the Fructus Xanthii must be well controlled to ensure the clinical therapeutic efficacy and safety. AIMS: A rapid, and sensitive using ultra-high performance liquid chromatography to triple quadrupole tandem mass spectrometry (UPLC-MS/MS) in selected reaction monitoring (SRM) mode was developed and validated for simultaneous quantitation of determination active and toxic ingredients form processed by stir-frying and raw materials of Fructus Xanthii. METHODS: Chromatographic separation of all targeted compound was performed on Waters ACQUITY UPLC HSS T3 column (50 mm × 2.1 mm, 1.8 µm). Moreover, the method was successfully applied in thirty-six samples of Fructus Xanthii collected from different sources in China. The processing method was optimized through Box-Behnken statistical design and response surface methodology. RESULTS: In this work, chemometrics was able to successfully discriminate and classify among samples. The optimal incubation conditions were as follows: under heating in a pot at 295 °C, medicine at 120 °C for 11.0 min with flipping frequently. CONCLUSIONS: Therefore, the established UPLC-QQQ-MS method in combination with chemometric analysis provides a rapid, flexible and reliable method for quality assessment of Fructus Xanthii. Importantly, the optimized experimental value of the processing process provides the basis for future research.

Experimental poisoning by Vernonia rubricaulis in sheep.

In order to evaluate the susceptibility of sheep to V. rubricaulis and to establish the clinical signs, serum biochemistry, and pathological findings, eight sheep were fed varying doses of V. rubricaulis. The onset of clinical signs occurred 6-48 h after the ingestion of V. rubricaulis. Clinical courses lasted 6-56 h after the ingestion of the plant. Serum activities of aspartate aminotransferase, gamma-glutamyl transferase, and alkaline phosphatase were highly elevated and glucose blood levels were low in affected sheep. Clinical signs consisted of apathy, anorexia, dry muzzle, respiratory distress, abdominal pain, and mushy feces with streaks of blood and mucus. Two sheep had neurological signs including muscle fasciculation, nystagmus, paddling movements, and blindness. Liver necrosis could be detected antemortem through liver biopsy. Five sheep died and three recovered. The liver was affected in all necropsied sheep; it increased in volume and had marked accentuation of the lobular pattern with red, depressed areas intercalated with a pale yellow network. Ascites and hydropericardium were consistent findings. Microscopically, centrilobular to massive coagulative necrosis was observed. Coagulative necrosis was also observed in a few proximal renal tubules. Microscopic lesions were not found in any other organs. The severity of liver lesions was proportional to the dose. Chemical analysis to detect carboxyatractyloside in V. rubricaulis plant material was negative. It is concluded that V. rubricaulis poisoning in sheep is clinically, biochemically, and pathologically characteristic of an acute hepatoxicosis.

UHPLC-PDA-ESI-TOF/MS metabolic profiling and antioxidant capacity of arabica and robusta coffee silverskin: Antioxidants vs phytotoxins.

A deeper knowledge of the chemical composition of coffee silverskin (CS) is needed due to the growing interest in its use as a food additive or an ingredient of dietary supplements. Accordingly, the aim of this paper was to investigate the metabolic profile of aqueous extracts of two varieties of CS, Coffee arabica (CS-A), Coffee canephora var. robusta (CS-R) and of a blend of the two (CS-b) and to compare it to the profile of Coffee arabica green coffee (GC). Chlorogenic acids, caffeine, furokauranes, and atractyligenins, phytotoxins not previously detected in CS, were either identified or tentatively assigned. An unknown compound, presumably a carboxyatractyligenin glycoside was detected only in GC. Caffeine and chlorogenic acids were quantified while the content of furokauranes and atractyligens was estimated. GC and CS were also characterized in terms of total polyphenols and antioxidant capacity. Differences in the metabolites distribution, polyphenols and antioxidant capacity in GC and CS were detailed.

Identification of atractyloside by LC-ESI-MS in alleged herbal poisonings.

An LC-MS screening method was developed to detect the presence of atractyloside (ATR), the toxic principle of a commonly used medicinal plant in South Africa, Callilepis laureola, in biological matrices such as body fluids and human viscera.

An enzyme immunoassay for atractyloside, the nephrotoxin of Callilepis laureola (Impila).

Tubers of Callilepis laureola, a traditional remedy, contain an inhibitor of oxidative phosphorylation; atractyloside. A "competitive" ELISA was developed, using the antiserum produced to an atractyloside-protein conjugate. An ovalbumin-atractyloside conjugate was adsorbed to microtitre wells and plates incubated with sample (atractyloside or tuber extract) and antiserum. After successive incubation with secondary antibody-enzyme conjugate and substrate, the absorbance was read at 405 nm. Antibody working dilution was low, but results, confirmed by thin layer chromatography, indicate the immunoassay has diagnostic potential.

Cocklebur toxicosis in cattle associated with the consumption of mature Xanthium strumarium.

Cockleburs (Xanthium spp.) are herbaceous annuals with worldwide distribution. Toxicoses are usually associated with the consumption of the seedlings in the cotyledon stage, which contain a high concentration of the toxic principle, carboxyatractyloside. The seeds are also known to contain the toxin, but it has long been assumed that the spiny capsule would deter their consumption. Six of 70 yearling calves died while being fed round bale hay composed predominantly of foxtail and mature cocklebur plants with burs. Clinical signs ranged from acute death to hyperexcitability, blindness, tense musculature, and spastic gaits with heads held high and ears erect. Some symptomatic calves would stumble, fall to lateral recumbency, convulse, and later recover. Overall, the herd was very uneasy. Prominent gross lesions were ascites and a firm, pale liver with a mottled hemorrhagic pattern on cut surface. The rumen contained numerous intact burs and well-ruminated grass. Histological examination of the liver revealed marked centrolobular degeneration and necrosis with associated hemorrhage and congestion. Brain lesions were present. Plant and tissue samples were analyzed for carboxyatractyloside with various results. Samples of rumen contents, urine, and burs contained 100-200 ppm, 0.1-0.05 ppm, and 0.1 ppm, respectively. Based on the history, clinical signs, pathological lesions, and chemical analyses, cocklebur toxicosis associated with consumption of mature Xanthium strumarium in hay was confirmed.

Gas chromatographic-mass spectrometric confirmation of atractyloside in a patient poisoned with Callilepis laureola.

The South African traditional remedy Impila (Callilepis laureola) contains the mitochondrial toxin atractyloside. The plant is sold widely and continues to lead to fatalities in patients. We describe, for the first time, a simple GC-MS procedure for the identification of atractyloside, which we have applied to the gastric washing from a poisoned patient and to extracts of Impila tuber.

[Participation of the adenine nucleotide translocator in the regulation of pyruvate oxidation in heart mitochondria]. / Uchastie perenoschika adeninnukleotidov v reguliatsii okisleniia piruvata v mitokhondriiakh serdtsa.

A regulatory role of adenine nucleotide translocator (ANT) was determined by titration of mitochondrial respiration (state 3) with carboxyatractyloside. It was shown that ANT regulates pyruvate oxidation: the control strength is more pronounced after depletion of endogenous substrates or after the increase in extramitochondrial ATP/ADP. The rate of succinate oxidation is controlled mainly by succinate dehydrogenase, while ANT does not participate in its regulation.