日本食品化学学会誌
Online ISSN : 2189-6445
Print ISSN : 1341-2094
ISSN-L : 1341-2094
クワ茶に含有されるシュウ酸カルシウム結晶とその人工胃液による溶出
河原 豊
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ジャーナル 認証あり

2024 年 31 巻 3 号 p. 116-121

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It is well known that the formation of calcium oxalate monohydrate (CaOx) crystal occurs in the tissues of mulberry (Morus alba L.) especially in the parenchyma cells adjacent to the vein. Therefore, the dissolution of the accumulated CaCx crystal may be detected by the wide-angle X-ray diffraction (WAXD) measurements when the mulberry leaf tea is treated with an artificial gastric solution. Firstly, the WAXD measurements were performed for the leaves of mulberry harvested in early October 2023 and, the diffraction peaks from CaCx were detected especially in the vein portion of the leaf. Nect, similar WAXD measurements were performed for the commercial mulberry leaf tea or the leaf tea powder and then, more marked CaCx crystal diffraction peaks were recorded, due to the condensation of CaCx during the tea making process. Finally, the commercial mulberry leaf powder was treated in an artificial gastric juice and, the occurrence of the dissolution of CaCx crystal was investigated using the WAXD measurements. The dissolution proceeded markedly even by the treatment at 37°C for min.
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