The total, soluble and insoluble oxalate contents of the small, large and cauline leaves
and small and large stems of miner’s lettuce (Claytonia perfoliata ) plants which had
been irrigated with tap water or a soluble fertilizer were extracted and measured using
HPLC chromatography. Overall, all plant parts of miner’s lettuce analyzed contained
high levels of total and soluble oxalates; however plants irrigated with fertilizer
contained lower levels of oxalates compared with plants irrigated with water. On a
dry matter basis, the small leaves contained higher levels of total oxalate when compared
to the total oxalate in the large leaves. Soluble oxalate in the leaves of plants irrigated
with water ranged from 2.6 to 7.5 mg/100g dry matter (DM) and was significantly
higher (P < 0.05) than the leaves of the fertilizer-watered plants, which ranged
from 1.8 to 2.8 mg/100g DM. The soluble oxalate in the small and large stems of the
fertilizer-watered plants ranged from 1.20 to 1.5 mg/100g DM and was significantly
lower (P < 0.05) than the water-treated small and large stems, which ranged from
3.75 to 4.4 mg/100g DM. It is recommended that the leaves of miner’s lettuce should
be consumed in moderation.
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