Fig. 1B Figure 1B (a and b) shows the results using 2 M urea/PBS pH 7.4. Under these solvent conditions, 26.8 ±% and 25.9 ±% of I-AC and I-PC respectively bound to the column in the native state (Table 1). The results indicate that 26% – 27% of collagen molecules could bindound to TiO2, irrespective of telopeptide. But after heat denaturation, these bound ratio amounts of I-AC and I-PC decreased to 17.2 ± 3.2 % and 11.6 ±2.5 %, respectively (Add the statistical analysis). Add the statistical analysis! Fig. 1C Figure 1C (a and b) shows the results with 2 M urea/HCl, pH 3.0. Even with this more potent dissociative solvent, 27.1 ±3.5 %, and 17.0 ±2.3 %, of the native I-AC and denatured I-AC, respectively, bound to the column (Table 1). This difference indicates that considerable amounts (17 – 27%) of I-AC molecules could link with TiO2, in this more robust dissociative condition. With I-PC, the percentages of bound collagen were markedly higher at 40.8 ±3.5 % and 24.1±2.3 % for native and denatured forms, respectively. We noticed that wWith all the native collagens, some tailing-peaks accompanied the pass-through peaks but with the denatured collagens, these were not observed (Figs. 1A – 1C). Table 1 Table 1 summarizes the percentages of the various collagens bound to Ti-binding percent of the various collagens with the three different solvents, totaling six categories: acid-soluble collagen (AC), pepsin solubilized collagen (PC), both of which include native and denatured collagens, each of which we chared on the column with three different solvents: dilute HCl, 2 M urea/PBS and 2M urea/HCl (pH 3.0). The figures indicate the ratio s (%) of the chromatographic area of the bound fraction (wash-out peaks with 0.025 M NaOH) to the total areas of the applied sample (sum of pass-through fractions and bound fraction), which corresponds to the strength of the Ti-binding the ability of each collagen. Comment 4-2 【P13, L13~P15, L2】-2【Dis to Res】There seemed appeared to be no essential difference in the results of chromatographic profiles with betweenof the three different solvents used as eluents. However, we found remarkable differences between the ratios of the pass-through fraction and wash-out peaks (the binding ratios) before and after heat denaturation. In the case of the native pepsin solubilized collagen (I-PC), we noticed observed that the binding ratio showed the highest value of 40.8 ±3.5% adsorption in 2 M urea (pH 3.0), while the Ti-binding ratio reduced to 24.1±2.3 % after heat denaturation. 【Dis to Res】 Comment 2/4-23 【P13, L13~P15, L2】-3 【Dis to Res】 Most interestingly, the Ti-binding ratios decreased after denaturation. These changes occurred in with all collagens analyzed, under with all three solvents, regardless of the presence of telopeptides. , Aas summarized in Table 1,. T and Fig. 2, we have shown for the first timethis is the first evidence that type I collagen can bind with to TiO2 in diluted HCl (pH. 4.0), 2 M urea (pH 7.4) and 2 M urea /HCl (pH 3.0). It is apparent that , tMoreover, the and that the Ti-binding ratio diminished to approximately 2/3 after the denaturation of the collagen and . Wwe obtained the same tendency ofa similar reduction of the Ti-binding ratio after denaturation in I-AC and I-PC. , as shown in Figure 2 and Table 1. showed shows that binding ratios 30.4, 26.8 and 27.1% of native collagens (I-AC), in pH 4.0 (HCl), pH 7.4 (2 M urea), and pH 3.0 (2 M urea) before denaturation. These Ti-binding ratios reduced after denaturation, to 19.3, 17.3 and 17.0%, in pH 4.0 (HCl), pH 7.4 (2 M urea) and pH 3.0 (2 M urea), respectively. These reductions were all statistically significant with Student's test, with p values of 0.003, 0.0015, and 0.028, with respect to the three different solvents..Comment 4-2【P13, L13~P15, L2】-4【Dis to Res】 We observed a reduction of the Ti-binding ability with I-PC. The results showed that before denaturation, 32.2, 25.9%, and 40.8% of I-PC were bound to the Ti column, in pH. 4.0 (HCl), pH 7.4 (2 M urea) and pH 3.0 (2 M urea), respectively. But, after denaturation, these binding ratios were reduced to 20.6, 11.6, and 24.1% in the above solvents, respectively (Fig. 2 and Table 1). 【Above three paragraphs (2/4-2, 2/4-3, and 2/4-4) were moved from Dis to Res (at the end of chromate-session)】DO NOT REPEAT ADDSTATI Comment 52-4/4 【p16, L14~P17, L3】-4【Dis to Res】As for tThe importance of requirement for functional of telopeptides in the binding, we obtained clear informationis indicated by comparing comparison of the chromatograms of I-AC and PC in the different solvents.. When we used dilute HCl (pH 4.0) was used as a solvent, the Ti-binding ratios between I-AC (30.4%) and PC (32.2%) were not significantly different (p: 0.56). This difference was much smaller in the denatured collagen, being 19.3% in I-AC and 20.6% in I-PC (p: 0.72). However, in the dissociative solvent of 2 M urea / HCl (pH 3.0), the percentag