Shandong Provincial Key Laboratory of Fiber Materials and Modern Textile

Qingdao, China

Shandong Provincial Key Laboratory of Fiber Materials and Modern Textile

Qingdao, China
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Pan Y.,Donghua University | Han G.,Donghua University | Han G.,Qingdao University | Han G.,Shandong Provincial Key Laboratory of Fiber Materials and Modern Textile | And 6 more authors.
Aquatic Botany | Year: 2011

Lotus fibers are the isolated helical secondary cell wall thickenings from tracheary elements of lotus (Nelumbo nucifera Gaertn) petioles. In this study the anatomical characteristics of lotus petioles and microstructures of tracheary elements were studied using light microscopy (LM) and scanning electron microscopy (SEM). The results show that vascular bundles of lotus petioles are scattered throughout ground tissue. Their tracheary elements are of various sizes and there are several patterns of secondary wall thickening present. However, only secondary thickening in a ribbon-like helical pattern can be drawn out from the petiole to form lotus fibers for subsequent utilization. Study of the microstructure of the tracheary elements reveals that there are two pit structures present in the end walls in addition to pits with intact pit membranes: those with porose or web-like remnants pit membrane and those that lack pit membranes. This is an indication of the transitional stage between tracheids and vessel elements. This study provides supportive evidence that lotus fibers are found in both helically thickened tracheids and helically thickened primitive vessels. © 2011 Elsevier B.V.


Pan Y.,Donghua University | Han G.,Donghua University | Han G.,Qingdao University | Han G.,Shandong Provincial Key Laboratory of Fiber Materials and Modern Textile | And 9 more authors.
Carbohydrate Polymers | Year: 2011

Lotus fiber is a natural cellulose fiber isolated from lotus petiole. Botanically, the fiber is the thickened secondary wall in xylem tracheary elements. In order to obtain essential information for the preparation and processing of lotus fibers, the fine structure and properties of lotus fibers were investigated by the aid of transmission electron microscopy (TEM), confocal laser scanning microscopy (CLSM), atomic force microscopy (AFM), X-ray diffraction (XRD), and so on. The results show that lotus fibers display a rough surface topography and an internal structure different from common plant fibers. The percent crystallinity and preferred orientation of crystallites in lotus fibers are 48% and 84%, respectively. Considering the average breaking tenacity and Young's modulus, lotus fibers are similar to cotton. The elongation of lotus fibers is only about 2.6% while their moisture regain is as high as 12.3%. © 2011 Elsevier Ltd. All rights reserved.


Li X.,Qingdao University | Li X.,Shandong Provincial Key Laboratory of Fiber Materials and Modern Textile | Han G.,Qingdao University | Han G.,Shandong Provincial Key Laboratory of Fiber Materials and Modern Textile | And 4 more authors.
Advanced Materials Research | Year: 2011

As a natural polymer, alginic acid is widely used in medical fields for its biodegradability, low toxicity and immunogenicity. In this paper, four kinds of cavernous calcium alginate wound dressings were prepared, and physical properties were tested, providing fundamental basis for further study. The results indicate that glycerin is not suitable as a plasticizer for this cavernous wound dressing; a relatively uniform structure of the calcium alginate wound dressing would be obtained as the solution temperature increased; the mechanical properties decrease with the increase of the pre-freezing time. © (2011) Trans Tech Publications, Switzerland.


Gong Y.,Shandong Provincial Key Laboratory of Fiber Materials and Modern Textile | Gong Y.,Qingdao University | Han G.,Shandong Provincial Key Laboratory of Fiber Materials and Modern Textile | Han G.,Qingdao University | And 10 more authors.
Biological Trace Element Research | Year: 2011

The relation between copper alginate fibers and immunotoxicity in animals was studied by dividing guinea pigs and mice into control groups and experimental groups. Varied weights of fibers were subcutaneously embedded in the experimental groups, whereas the control groups were operated on simulatively. Morphology analysis, erythrocyte osmotic fragility (EOF) test, direct plaque-forming cell (PFC) assay, quantitative hemolysis spectrophotometry (QHS) assay, macrophages phagocytosis assay, and pathology analysis were used to examine morphology, microstructure, and immunotoxicity. With increasing doses of copper alginate fibers, the EOF of experimental groups increased in contrast with the control group. Moreover, the antibody level decreased based on the results of the PFC and QHS assays, and macrophages phagocytosis descended in relation to dose. However, the immune functions were weakened without time dependence. According to pathologic photographs, the partial organs were damaged, implying bad histocompatibility. Hence, copper alginate fiber is proved to be a harmful material for medical devices. © Springer Science+Business Media, LLC 2011.


PubMed | Shandong Provincial Key Laboratory of Fiber Materials and Modern Textile
Type: Journal Article | Journal: Biological trace element research | Year: 2011

The relation between copper alginate fibers and immunotoxicity in animals was studied by dividing guinea pigs and mice into control groups and experimental groups. Varied weights of fibers were subcutaneously embedded in the experimental groups, whereas the control groups were operated on simulatively. Morphology analysis, erythrocyte osmotic fragility (EOF) test, direct plaque-forming cell (PFC) assay, quantitative hemolysis spectrophotometry (QHS) assay, macrophages phagocytosis assay, and pathology analysis were used to examine morphology, microstructure, and immunotoxicity. With increasing doses of copper alginate fibers, the EOF of experimental groups increased in contrast with the control group. Moreover, the antibody level decreased based on the results of the PFC and QHS assays, and macrophages phagocytosis descended in relation to dose. However, the immune functions were weakened without time dependence. According to pathologic photographs, the partial organs were damaged, implying bad histocompatibility. Hence, copper alginate fiber is proved to be a harmful material for medical devices.

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