Oxalate, magnesium and calcium content in selected kinds of tea: impact on human health

Some Antinutrient Compositions and in Vitro Antioxidant Properties of Milled Carica Papaya (Pawpaw) Peels and Seeds

“…Phenols are bioactive antioxidants owing to the multiple hydroxyl groups in their structures hence enhanced hydrogen and electron donating abilities (Sarikurkcu, 2011;Boskou, 2006). Oxalate in excess by exceeding the solubility limit results in the formation of calcium oxalate kidney stones (Brzezicha-Cirocka et al, 2016;Holmes and Kennedy, 2000). However, the dietary contribution to excess oxalate was reportedly low (Holmes and Kennedy, 2000).…”

Maize Oxalyl-CoA Decarboxylase1 Degrades Oxalate and Affects the Seed Metabolome and Nutritional Quality

“…Certain pathogens secrete oxalate to enhance their pathogenicity in plants by stimulating stomatal opening and cell wall permeability, ultimately leading to programmed cell death (Bateman and Beer, 1965;Guimarães and Stotz, 2004;Kim et al, 2008). Oxalate in plant foods has an adverse impact on human health, as oxalate acts as an antinutrient that impairs the absorption of Ca and some other minerals (Weaver et al, 1987;Brzezicha-Cirocka et al, 2016). Indeed, compared with kale (Brassica oleracea), which has a low oxalate content, spinach (Spinacia oleracea) has a high level of oxalate and poor Ca bioavailability (Weaver et al, 1987;Heaney and Weaver, 1990).…”

Gas chromatographic Analysis of Organic Acids in Japanese Green Tea Leaves

“…some studies, may increase the risk of kidney stone formation 6 10 . However, the intake of Sencha is not expected to induce kidney stone formation, as i this tea has a lower oxalic acid content than Gyokuro and Matcha and ii epigallocatechin gallate contained in Sencha may actually suppress kidney stone formation 11,12 . The growing export of Japanese green tea needs to be backed up by high tea quality, and high oxalic acid content should therefore be avoided.…”