A high dietary oxalate intake influences mineral and trace element absorption in humans and may lead to calcium oxalate stone formation due to the ability of oxalate to form insoluble complexes with ...divalent cations in the gastrointestinal tract. The soluble and total oxalate contents of species in the Polygonaceae, Amaranthaceae and Chenopodiaceae families were measured using an HPLC-enzyme-reactor method. Polygonaceae, Amaranthaceae and Chenopodiaceae include most of the foods with excessively high oxalate concentrations. Amaranth is a specie of the Amaranthaceae family, Polygonaceae include buckwheat, rhubarb, and sorrel, whereas beetroot, mangold, spinach, and quinoa are species of the Chenopodiaceae family. Obviously, oxalate is accumulated in these plant families in each plant tissue, i.e., in leaves, stems, hypocotyl-root and nuts. The highest oxalate content was found in leaves and stems of plants in these families. Soluble oxalate ranged from 59 to 131
mg/100
g in roots and nuts, and from 258 to 1029
mg/100
g in leaves and stems. Total oxalate ranged from 143 to 232
mg/100
g in roots and nuts, and from 874 to 1959
mg/100
g in leaves and stems. Patients with calcium oxalate stone disease should be advised to avoid these oxalate-rich foods.
Oxalate Content of Cereals and Cereal Products Siener, Roswitha; Hönow, Ruth; Voss, Susanne ...
Journal of agricultural and food chemistry,
04/2006, Volume:
54, Issue:
8
Journal Article
Peer reviewed
Detailed knowledge of food oxalate content is of essential importance for dietary treatment of recurrent calcium oxalate urolithiasis. Dietary oxalate can contribute considerably to the amount of ...urinary oxalate excretion. Because cereal foods play an important role in daily nutrition, the soluble and total oxalate contents of various types of cereal grains, milling products, bread, pastries, and pasta were analyzed using an HPLC-enzyme-reactor method. A high total oxalate content (>50 mg/100 g) was found in whole grain wheat species Triticum durum (76.6 mg/100 g), Triticum sativum (71.2 mg/100 g), and Triticum aestivum (53.3 mg/100 g). Total oxalate content was comparably high in whole grain products of T. aestivum, that is, wheat flakes and flour, as well as in whole grain products of T. durum, that is, couscous, bulgur, and pasta. The highest oxalate content was demonstrated for wheat bran (457.4 mg/100 g). The higher oxalate content in whole grain than in refined grain cereals suggests that oxalic acid is primarily located in the outer layers of cereal grains. Cereals and cereal products contribute to the daily oxalate intake to a considerable extent. Vegetarian diets may contain high amounts of oxalate when whole grain wheat and wheat products are ingested. Recommendations for prevention of recurrence of calcium oxalate stone disease have to take into account the oxalate content of these foodstuffs. Keywords: Dietary oxalate; cereals; cereal products; calcium oxalate stone disease
Oxalate content of beverages Siener, Roswitha; Seidler, Ana; Voss, Susanne ...
Journal of food composition and analysis,
October 2017, 2017-10-00, Volume:
63
Journal Article
Peer reviewed
•Oxalate content of a variety of alcoholic and non-alcoholic beverages was analyzed.•The highest oxalate concentrations were found in black, green and iced teas.•Oxalate content of wines was lower ...than that of the corresponding fruit juices.•Oxalate levels of soft, wellness, energy and sports drinks were low.•Certain beverages may provide considerable amounts of highly bioavailable oxalate.
A high fluid intake is an integral part of the measures for the recurrence prevention of calcium oxalate stone formation. Since dietary oxalate is a primary risk factor for hyperoxaluria, the oxalate content of a wide variety of alcoholic and non-alcoholic beverages was analyzed using a validated HPLC-enzyme-reactor method. The oxalate concentrations were 3.21–6.34mg/100mL in green and black teas, 0.28–1.96mg/100mL in iced teas and 0.08–1.82mg/100mL in herbal teas. The oxalate levels of soft, wellness, energy and sports drinks were below 0.81mg/100mL. The oxalate content varied among beer and wine, ranging from 0.30mg/100mL in white wine to 1.78mg/100mL in non-alcoholic beer. The oxalate concentration of wines was lower than that of the corresponding fruit juices. Certain beverages may provide considerable amounts of highly bioavailable soluble oxalate. Further studies should examine the effect of fermentation on the oxalate content.
•Oxalate content of vegetable and fruit juices, nectars and drinks was analyzed.•Highest oxalate concentrations were found in rhubarb nectar and beetroot juices.•Ingestion of certain vegetable juices ...can contribute considerably to oxalate intake.•Calcium oxalate stone formers should pay attention to the ingested amount of juices.
Fruit and vegetable juices are recommended for the treatment of hypocitraturia in calcium oxalate stone disease as alternatives to drugs containing alkaline citrate. Since dietary oxalate can contribute considerably to urinary oxalate excretion, the oxalate content of vegetable and fruit juices, nectars and drinks was analyzed using a validated HPLC-enzyme-reactor method. The highest oxalate concentrations were found in rhubarb nectar (198.3mg/100ml) and beetroot juices (60.1–70.0mg/100ml). The oxalate levels of all other beverages were below 10mg/100ml. Interestingly, except for carrot juice, the oxalate content of juices containing vegetables from organic farming was higher than from conventional farming. The consumption of even 500ml/d of certain vegetable juices can contribute to a considerable extent to the daily oxalate intake. Calcium oxalate stone formers should therefore pay attention not only to the oxalate content but also to the ingested amount of these beverages.
In a pilot study, we wanted to influence the food selection of employees in a pediatric clinic bistro aiming to increase the sale of "healthy" grain buns (number and proportion of all sold buns). ...During basic assessment, the mean weekly sale of grain buns was 98 (52.3%) and in the second week of highlighting them on a green napkin under a transparent hood (intervention 1) reached 124 (54.6%). However, just when starting intervention 2 (position in front of the display), the bistro was closed due to the Coronavirus pandemic. Thus, necessary public health measures stopped our interventional public health experiment.
Alkaline fuel cell (AFC) hybrids with the capability to shut down completely between uses (by draining the circulating KOH electrolyte) can expect an operating life of about 4000 h, which is ...equivalent to 200,000 km of driving, They should be able to compete on cost with heat engines (US$50 to US$100 per kW). An early model is the hydrogen/air fuel cell lead–acid hybrid car, built by K. Kordesch in the 1970s. Improved air electrodes plus new variations of the bipolar stack assembly developed in Graz, make success probable. In cooperation with Electric Auto (EAC), an ammonia cracker is also in development. A RAM™ battery–AFC hybrid combination has been optimized.
On a voulu voir dans l’arrivée d’égyptologues allemands en Égypte à la fin du xixe et au début du xxe siècle des motivations liées à la politique extérieure de l’Empire allemand nouvellement fondé. ...Derrière la nomination de Ludwig Borchardt au Consulat général du Caire et la fondation de l’Institut allemand du Caire se trouvait en fait l’École de Berlin d’égyptologie, dirigée par Adolf Erman, qui avec son ambitieux projet de Dictionnaire de la langue égyptienne avait engagé une confrontation avec la production scientifique traditionnelle française. Alors que Erman et Borchardt réclamaient constamment une reconnaissance internationalle de l’égyptologie allemande, la diplomatie allemande, circonspecte, observait non sans méfiance cet antagonisme scientifique franco-allemand.
Die Entdeckung der Nofretete-Büste ist in einen komplexen historischen Sachverhalt eingebettet. Die Rolle, die die regierungsgestützte deutsche ägyptologische Vertretung vor Ort dabei gespielt hat, ...wird häufig falsch eingeschätzt. Die jüngste Aufarbeitung von umfangreichem Aktenmaterial in internationalen Archiven hat neue Ergebnisse erbracht.
Magnesium treatment for calcium oxalate urolithiasis is discussed controversially. The aim of this study was to investigate the influence of magnesium supplementation on the oxalate absorption.
The ...13C2oxalate absorption test was always performed three times in 6 healthy volunteers under standardized conditions, with one 10-mmol magnesium supplement together with the labeled oxalate and with two 10-mmol magnesium supplements given in 12-hour intervals.
The mean intestinal oxalate absorption under standard conditions was 8.6 +/- 2.83%. The oxalate absorption with one 10-mmol magnesium supplement was 5.2 +/- 1.40% and with two supplements 5.5 +/- 1.62%. Both decreases were statistically significant relative to the standard test, however, not significantly different from each other.
The results show that magnesium administration decreases the oxalate absorption, when magnesium is taken together with oxalate. However, magnesium administration does not decrease the oxalate absorption, when magnesium and oxalate intake differ by 12 h.
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