In this work, we prepared novel cellulosic paper by incorporating tannin into the kraft pulp for potential application in active food packaging. The kraft pulp fibers were firstly periodate oxidized to obtain the dialdehyde cellulosic fibers, and then reacted with varied dosages of tannin to incorporate them into the fibers by covalent bondings between aldehyde groups on cellulose and active hydrogen on tannin. Handsheets were prepared using the tannin incorporated fibers through papermaking process and the properties were characterized. The percentage of tannin in the paper increased with the increase of the tannin dosage. FT-IR spectra confirmed the successful incorporation of tannin into the cellulosic fibers. It was found that paper after incorporation of tannin turned to be surface hydrophobic with contact angles higher than 90°, which may probably due to the covalent bonds between tannin and cellulose. The handsheets show high antioxidative and UV-shielding properties, which both increased with the increase of the tannin percentage in the paper. Water vapor transmission rate (WVTR) decreased after the incorporation of tannin, and this could facilitate its application in food packaging. The breaking length of tannin incorporated paper decreased insignificantly, less than 10% with the tannin percentage as high as 45%.

在这项工作中，我们通过将单宁酸掺入牛皮纸浆中制备了新型纤维素纸，有望在活性食品包装中应用。首先将牛皮纸浆纤维高碘酸氧化，得到二醛纤维素纤维，然后与各种剂量的单宁反应，通过纤维素上醛基与单宁上活性氢之间的共价键将其掺入纤维。使用单宁掺入的纤维通过造纸工艺制备手抄纸，并表征其性能。丹宁酸含量随丹宁酸用量的增加而增加。FT-IR光谱证实单宁成功地掺入了纤维素纤维中。发现单宁掺入后的纸张变成表面疏水性，接触角大于90°，这可能是由于单宁和纤维素之间的共价键。手抄纸显示出高的抗氧化和紫外线屏蔽性能，它们都随着纸张中单宁含量的增加而增加。单宁掺入后水蒸气透过率（WVTR）降低，这可能有助于其在食品包装中的应用。单宁掺入纸的断裂长度无明显减少，小于10％，单宁百分比高达45％。