Ehime University

Marusumi Paper Co., Ltd.

Hiromi Uchimura

Shou Hiasa

Tomoki Yabutani

An analysis tool for use in optical analysis, comprising a detection unithaving through-holespenetrating through the surface and the rear side of a base material, the detection unitcomprising, inside of the base material, a plurality of voidsthat allows a liquid to pass through by capillary action and that communicate with the through-holes, and the through-holesbeing formed with a size that enables a liquid to be held by surface tension. Therefore, by irradiating the detection unitwith light, it is possible to obtain transmitted light Lthat has been transmitted through a liquid film Lf. By analyzing the transmitted light L, a target component in a sample L can be appropriately quantified.

Optical analysis chip

[Object] An object is to provide a sulfonated fine cellulose fiber having excellent transparency, a sulfonated pulp fiber suitable for the sulfonated fine cellulose fiber, a method for producing these fibers, and a derivative pulp containing the sulfonated pulp fiber. [Means for achieving the object] The sulfonated pulp fiber of the present invention is a pulp fiber comprising a plurality of cellulose fibers, wherein a part of hydroxyl groups of the cellulose fibers of the pulp fiber is substituted with sulfo groups, an introduction amount of sulfur attributable to the sulfo groups is adjusted to be higher than 0.42 mmol/g while maintaining a fiber shape, and a water retention value of the pulp fiber is adjusted to 150% or more. Since the sulfonated pulp fiber has a predetermined water retaining property or more while maintaining the fiber shape, the degree of flexibility in handling can be improved.

Sulfonated pulp fibers, derivative pulp, sulfonated fine cellulose fibers, method for producing sulfonated fine cellulose fibers, and method for producing sulfonated pulp fibers

A functional material for testing a liquid sample includes a based material in a sheet shape and a channel part provided on a mounting surface of the base material wherein the channel part is composed with water-permeable fibers having permeability, and water-impermeable fibers having impermeability. The water-permeable fibers and the water-impermeable fibers are arranged along the longitudinal direction of the channel part, forming voids wherein the voids are in a mesh structure in which one of the voids connects to another of the voids such that the empty spaces are linked from a base end to a tip end of the channel part. A thickness of the channel part is ranged from 20 &#x3bc;m mm to 5 mm, and a width of the voids is ranged from 10 &#x3bc;m to 200 &#x3bc;m, allowing the liquid sample to move from the base end to the tip end due to capillarity.

Functional material for testing liquid sample

Disclosed herein is a functional material having the function of detecting a predetermined substance or the like present in a sample with high accuracy even when the amount of the sample is small, and a method for producing the functional material. The functional material includes a channel partthat allows a liquid to pass therethrough, and the channel partis made of a water-permeable materialcontaining a water-impermeable material. The water-impermeable materialis placed between pieces of the water-permeable material, and therefore voidscan be formed between the water-impermeable materialand the water-permeable material. That is, a network of the voidscan be formed in the channel part. A liquid sample supplied to the channel partis allowed to move while being allowed to penetrate into the voids. In addition, components other than a desired component can be separated and removed from a mixture present in the liquid sample while the liquid sample is allowed to move. Therefore, a water-absorbing function and a filtering function can be imparted to the channel part

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Shikokuchuo, Japan

Hiromi Uchimura