Moriguchi H, Hara Y, Tozuka K, Tokue A
Department of Urology, Jichi Medical School.
Hinyokika Kiyo. 1991 Jan;37(1):1-5.
Powder samples of 56 calcium oxalate stones the contents of weddellite, whewellite and apatite of which had been determined by thermogravimetry (TG) were studied by infrared spectroscopy (IR). When the ratio of the weddellite content to the total of weddellite and whewellite (weddellite ratio) calculated using Oka's method on the infrared spectra was compared with that determined previously by TG, the correlation coefficient between these ratios was 0.734. For the 24 calcium oxalate stones the apatite content of which was less than 10%, the correlation coefficient between these ratios was 0.976, although the weddellite ratio calculated using Oka's method was significantly higher than that determined by TG (P less than 0.01). In an attempt to estimate the weddellite to whewellite ratio by IR regardless of the content of apatite, the ratio of the depth of the absorption band at 780 cm-1 (H780) to the depth of the absorption band at 1,320 cm-1 (H1320) was compared with the ratio of the whewellite content to the total of whewellite and weddellite contents determined by TG. The correlation coefficient between these ratios was 0.953. We conclude that the ratio of H780 to H1320 determined from the infrared spectra obtained from a 0.3 to 1 mg powder sample of calcium oxalate stone is useful in the estimation of the weddellite to whewellite ratio.
对56份草酸钙结石粉末样本进行了红外光谱（IR）研究，这些样本的甘羟磷灰石、二水草酸钙和磷灰石含量已通过热重分析（TG）测定。当将根据红外光谱用冈田法计算的甘羟磷灰石含量与甘羟磷灰石和二水草酸钙总量的比值（甘羟磷灰石比值）与先前通过TG测定的比值进行比较时，这些比值之间的相关系数为0.734。对于24份磷灰石含量小于10%的草酸钙结石，尽管用冈田法计算的甘羟磷灰石比值显著高于通过TG测定的比值（P小于0.01），但这些比值之间的相关系数为0.976。为了通过红外光谱估计甘羟磷灰石与二水草酸钙的比值而不考虑磷灰石含量，将780 cm-1处吸收带深度（H780）与1320 cm-1处吸收带深度（H1320）的比值与通过TG测定的二水草酸钙含量与二水草酸钙和甘羟磷灰石含量总和的比值进行比较。这些比值之间的相关系数为0.953。我们得出结论，从0.3至1毫克草酸钙结石粉末样本获得的红外光谱中确定的H780与H1320的比值可用于估计甘羟磷灰石与二水草酸钙的比值。
