JP2021013325A - Confectionery and method for producing confectionery - Google Patents

Abstract

To improve texture of a confectionery having bubbles inside, like Dorayaki (sweet bean jam pancake) skin, Imagawayaki (a thick pancake filled with sweet bean jam) skin, Taikyaki (a fish-shaped pancake filled with sweet bean jam) skin, Manju (a bun filled with sweet bean jam) skin, a cake, a muffin, a madeleine, a waffle, a pancake, a bouchee, a castella (sponge cake), a doughnut, and a cookie.SOLUTION: A confectionery contains a cellulose nanofiber, preferably a carboxymethylated cellulose nanofiber, so that fine bubbles stably exist therein, resulting in a good texture.SELECTED DRAWING: None

Description

The present invention relates to confectionery containing cellulose nanofibers and a method for producing confectionery containing cellulose nanofibers.

Confectionery such as dorayaki, cakes, castella, donuts, and cookies are heated by baking, frying, or steaming dough mixed with flour, milk, sugar, eggs, water, and if necessary, oils and fragrances. Is provided.

The texture of the above confectionery may deteriorate over time after production. In order to solve such a problem, it has been proposed to improve the moist texture and the melting feeling in the mouth by adding acetylated starch as a texture improving agent (Patent Document 1).

JP-A-2017-176105

However, the method of Patent Document 1 has insufficiently improved the texture of confectioneries having bubbles inside, such as dorayaki and sponge cake. It is considered that this is because the bubbles are coarse and easily crushed, and the viscosity of the dough is insufficient.

Therefore, an object of the present invention is to provide a confectionery having a stable presence of fine bubbles and an excellent texture.

As a result of diligent studies to achieve such an object, the present inventor has found that it is effective to blend cellulose nanofibers (CNF), and has completed the present invention.

The present invention provides:
(1) Confectionery containing wheat flour, sugars, milk components, eggs, and cellulose nanofibers.
(2) The confectionery according to (1), wherein the cellulose nanofibers are anion-modified cellulose nanofibers.
(3) The confectionery according to (1) to (2), wherein the anion-modified cellulose nanofiber is a cellulose nanofiber having a carboxyl group or a cellulose nanofiber having a carboxylalkyl group.
(4) The confectionery according to (3), wherein the anion-modified cellulose nanofiber is a carboxymethylated cellulose nanofiber having a carboxymethyl substitution degree in the range of 0.01 to 0.50.
(5) The confectionery according to any one of (1) to (4), which further contains carboxymethylated cellulose.
(6) The confectionery consists of dorayaki skin, Imagawayaki skin, taiyaki skin, bun skin, cake, muffin, madeleine, waffle, pancake, busse, castella, donut, and cookie. The confectionery according to any one of (1) to (5), which is one of the selected types.

According to the present invention, it is possible to provide confectionery having a stable presence of fine bubbles and an excellent texture.

Hereinafter, the present invention will be described in detail. In the present invention, "~" includes a fractional value. That is, "X to Y" includes the values X and Y at both ends thereof.

The confectionery of the present invention contains flour, sugars, milk components, eggs, and cellulose nanofibers.

(flour)
The flour used in the confectionery of the present invention is not particularly limited, and examples thereof include strong flour, semi-strong flour, medium-strength flour, weak flour, durum flour, and whole grain flour. One of these flours may be used alone, or two or more of them may be used in combination.

(Sugar)
The saccharides used in the confectionery of the present invention are not particularly limited, and in addition to monosaccharides such as glucose and fructose, disaccharides such as maltose, sucrose, and lactose, powders such as isomerized sugar, starch syrup, reduced starch syrup, and sugar alcohol. Various sugars of body and liquid can be used. One of these saccharides may be used alone, or two or more thereof may be used in combination.

(Milk component)
Examples of the milk component used in the confectionery of the present invention include milk, skim milk, skim milk powder, full-fat milk powder, sweetened milk powder and the like. In the present invention, it is preferable to use milk from the viewpoint of improving the texture described later.

(egg)
Examples of the egg used in the confectionery of the present invention include whole egg, sterilized liquid egg yolk, frozen egg yolk, dried egg yolk, sweetened egg yolk and the like. In the present invention, it is preferable to use whole eggs from the viewpoint of improving the texture described later.

(Auxiliary raw material)
In the present invention, if necessary, an auxiliary raw material generally used in the production of confectionery, or an auxiliary raw material used depending on the type and desired quality of confectionery can be used. Specifically, swelling agents such as salt and baking soda, dairy products such as fresh cream, cheese and cream cheese, fats and oils such as honey, shortening, margarine, butter, liquid oil and emulsified fat, glycerin fatty acid ester and sucrose fatty acid ester. , Emulsifiers such as stearoyl calcium lactate, thickening polysaccharides such as carboxymethylated cellulose, guar gum, xanthan gum and carrageenan, spices such as cinnamon and basilico, Western liquors such as brandy and lamb, dried fruits such as raisins and dried cherries. Nuts such as almonds and peanuts, α-amylase, β-amylase, glucoamylase, protease, lipase, xylase, hemicellase, glucose oxidase and other enzymes, fragrances (eg vanilla essence), artificial sweeteners (eg aspartame), pectin, guar gum Examples include dietary fibers such as decomposition products, agarose, glucomannan, polydextrose, sodium alginate, cellulose, hemicellulose, lignin, chitin, chitosan, and indigestible dextrin, active gluten, soybean protein, matcha powder, chocolate, and cocoa powder. it can.

(Cellulose nanofiber)
In the present invention, cellulose nanofibers (hereinafter, may be referred to as CNF) are fine fibers having a fiber width of about 1 to 500 nm, which is obtained by refining pulp or the like, which is a cellulosic raw material, to the nanometer level. .. The average fiber diameter and average fiber length of cellulose nanofibers shall be the average of the fiber diameter and fiber length obtained from the results of observing each fiber using an atomic force microscope (AFM) or a transmission electron microscope (TEM). Can be obtained by Well, the average aspect ratio of cellulose nanofibers is usually 50 or more. The upper limit is not particularly limited, but is usually 1000 or less. The average aspect ratio can be calculated by the following formula:
Aspect ratio = average fiber length / average fiber diameter

Cellulose nanofibers are obtained by applying mechanical force to pulp to make it finer, and contain unmodified cellulose, carboxylated cellulose (also called oxidized cellulose), carboxymethylated cellulose, and phosphate ester groups. It can be obtained by defibrating anionic-modified cellulose such as introduced cellulose and modified cellulose such as cationized cellulose. The average fiber length and average fiber diameter of the fine fibers can be adjusted by oxidation treatment and defibration treatment. In the present invention, it is preferable to use carboxymethylated (CM-modified) cellulose nanofibers obtained by defibrating carboxymethylated cellulose obtained by performing carboxymethylation treatment.

(Cellulose raw material)
Examples of the cellulose raw material for producing the cellulose nanofibers used in the present invention include vegetable materials (for example, wood, bamboo, hemp, jute, kenaf, agricultural land waste, cloth, pulp) and animal materials (for example, squirrel). Species), algae, microorganisms (for example, acetobacter) products, and the like. Examples of pulp include softwood unbleached kraft pulp (NUKP), softwood bleached kraft pulp (NBKP), broadleaf unbleached kraft pulp (LUKP), broadleaf bleached kraft pulp (LBKP), softwood unbleached sulphite pulp (NUSP), and softwood bleached. Examples thereof include sulfite pulp (NBSP), thermomechanical pulp (TMP), recycled pulp, and used paper. All of these can be used, but plant- or microbial-derived cellulose fibers are preferred, and plant-derived cellulose fibers are more preferred.

(Carboxymethylation)
In the present invention, when carboxymethylated cellulose nanofibers are used, the carboxymethylated cellulose may be obtained by carboxymethylating the above-mentioned cellulose raw material by a known method, or a commercially available product may be used. In either case, the degree of carboxymethyl substitution per anhydrous glucose unit of cellulose is preferably 0.01 to 0.50. The following method can be mentioned as an example of a method for producing such carboxymethylated cellulose. Cellulose is used as a base material, and 3 to 20 times by mass of water or lower alcohol is used as a solvent. Specifically, water, methanol, ethanol, N-propyl alcohol, isopropyl alcohol, N-butanol, isobutanol, tertiary butanol and the like can be used alone or in combination of two or more. When a mixed solvent of water and a lower alcohol is used, the mixing ratio of the lower alcohol is 60 to 95% by mass. As the mercerizing agent, 0.5 to 20 times mol of alkali metal hydroxide per anhydrous glucose residue of the bottoming material, specifically sodium hydroxide and potassium hydroxide is used. The bottoming material, the solvent, and the mercerizing agent are mixed, and the mercerization treatment is carried out at a reaction temperature of 0 to 70 ° C., preferably 10 to 60 ° C., and a reaction time of 15 minutes to 8 hours, preferably 30 minutes to 7 hours. .. Then, a carboxymethylating agent was added in an amount of 0.05 to 10.0 times per glucose residue, the reaction temperature was 30 to 90 ° C., preferably 40 to 80 ° C., and the reaction time was 30 minutes to 10 hours, preferably 1. The etherification reaction is carried out for 4 to 4 hours.

<Carboxymethylated cellulose nanofibers>
The carboxymethylated cellulose nanofibers of the present invention maintain at least a part of the fibrous shape even when dispersed in water. That is, when the aqueous dispersion of carboxymethylated cellulose nanofibers is observed with an electron microscope, a fibrous substance can be observed. Further, when the carboxymethylated cellulose nanofibers are measured by X-ray diffraction, the peak of the cellulose type I crystal can be observed.

<Crystallinity of cellulose type I>
The crystallinity of cellulose in the carboxymethylated cellulose nanofibers used in the present invention is 40% or more, preferably 50% or more for crystal type I. When the crystallinity of cellulose type I is as high as 40% or more, the proportion of cellulose that does not dissolve in a solvent such as water and maintains the crystal structure is high, so that the thixotropy becomes high (thixotropy), and the thickener, etc. Becomes suitable for viscosity adjustment applications. Further, for example, when added to, for example, but not limited to, a gel-like substance (for example, food or cosmetics), there is an advantage that excellent shape retention can be imparted. The crystallinity of cellulose can be controlled by the concentration of the mercerizing agent, the temperature during treatment, and the degree of carboxymethylation. Since a high concentration of alkali is used in mercerization and carboxymethylation, type I crystals of cellulose are easily converted to type II, but they are modified by adjusting the amount of alkali (mercerizing agent) used. By adjusting the degree, the desired crystallinity can be maintained. The upper limit of the crystallinity of cellulose type I is not particularly limited. In reality, about 90% is considered to be the upper limit.

The method for measuring the crystallinity of cellulose type I of carboxymethylated cellulose nanofibers is as follows:
The sample is placed on a glass cell and measured using an X-ray diffraction measuring device (LabX XRD-6000, manufactured by Shimadzu Corporation). The crystallinity is calculated by using a method such as Segal, and the diffraction intensity of the 002 surface of 2θ = 22.6 ° and 2θ = are based on the diffraction intensity of 2θ = 10 ° to 30 ° in the X-ray diffraction diagram. It is calculated by the following formula from the diffraction intensity of the amorphous portion of 18.5 °.
Xc = (I002c-Ia) / I002c × 100
Xc = Cellulose type I crystallinity (%)
I002c: 2θ = 22.6 °, diffraction intensity of 002 surface Ia: 2θ = 18.5 °, diffraction intensity of amorphous part

The proportion of type I crystals in the nanofibers of carboxymethylated cellulose is usually the same as that in the carboxymethylated cellulose before making the nanofibers.

<Carboxymethyl degree of substitution>
The carboxymethylated cellulose nanofibers used in the present invention have a carboxymethyl substitution degree per anhydrous glucose unit of cellulose of 0.50 or less. If the degree of carboxymethyl substitution exceeds 0.50, it dissolves in water and it is considered that the fiber shape cannot be maintained. Considering operability, the degree of substitution is preferably 0.01 to 0.50, more preferably 0.02 to 0.50, still more preferably 0.05 to 0.40. It is more preferably 0.10 to 0.40. By introducing a carboxymethyl group into cellulose, the celluloses electrically repel each other and can be defibrated into nanofibers, but the degree of carboxymethyl substitution per anhydrous glucose unit is 0.01 or more. If it is too small, defibration may be insufficient and highly transparent cellulose nanofibers may not be obtained. In the conventional aqueous medium method, it is difficult to obtain carboxymethylated cellulose nanofibers having a cellulose type I crystallinity of 60% or more in the range of 0.25 to 0.40 carboxymethyl substitution. However, the present inventors have carboxymethylation in which the degree of carboxymethyl substitution is in the range of 0.20 to 0.40 and the crystallinity of cellulose type I is 60% or more by, for example, a method described later. We have found that we can produce cellulose nanofibers. The degree of carboxymethyl substitution can be adjusted by controlling the amount of the carboxymethylating agent to be reacted, the amount of the mercerizing agent, the composition ratio of water and the organic solvent, and the like.

In the present invention, the anhydrous glucose unit means individual anhydrous glucose (glucose residue) constituting cellulose. The degree of carboxymethyl substitution (also referred to as the degree of etherification) is the ratio of hydroxyl groups in glucose residues constituting cellulose that are substituted with carboxymethyl ether groups (carboxymethyl per glucose residue). The number of ether groups) is shown. The degree of carboxymethyl substitution may be abbreviated as DS.

The method for measuring the degree of carboxymethyl substitution is as follows:
Weigh approximately 2.0 g of the sample and place it in an Erlenmeyer flask with a 300 mL stopper. Add 100 mL of a solution of 100 mL of special grade concentrated nitric acid to 1000 mL of methanol nitrate and shake for 3 hours to convert the salt (CMC) of carboxymethylated cellulose nanofibers into H-CMC (hydrogen-type carboxymethylated cellulose nanofibers). .. Weigh 1.5 to 2.0 g of the absolutely dry H-CMC and place it in an Erlenmeyer flask with a 300 mL stopper. Wet H-CMC with 15 mL of 80% methanol, add 100 mL of 0.1N-NaOH, and shake at room temperature for 3 hours. Using phenolphthalein as an indicator, back titrate excess NaOH with 0.1 N-H ₂ SO ₄ , and calculate the degree of carboxymethyl substitution (DS value) by the following formula.
A = [(100 x F'-0.1N-H ₂ SO ₄ (mL) x F) x 0.1] / (H-CMC
Absolute dry mass (g))
Degree of substitution of carboxymethyl = 0.162 × A / (1-0.058 × A)
F': 0.1N-H ₂ SO ₄ factor F: 0.1N-NaOH factor.

The degree of carboxymethyl substitution in nanofibers of carboxymethylated cellulose is usually the same as the degree of carboxymethyl substitution in carboxymethylated cellulose before making it into nanofibers.

<Fiber diameter, aspect ratio>
The carboxymethylated cellulose nanofibers used in the present invention have nanoscale fiber diameters. The average fiber diameter is preferably 3 nm to 500 nm, more preferably 3 nm to 150 nm, still more preferably 3 nm to 20 nm, still more preferably 5 nm to 19 nm, still more preferably 5 nm to 15 nm.

The aspect ratio of the carboxymethylated cellulose nanofibers is not particularly limited, but is preferably 350 or less, more preferably 300 or less, further preferably 200 or less, still more preferably 120 or less. , 100 or less, and even more preferably 80 or less. When the aspect ratio is 350 or less, the fibers are not excessively long, the entanglement between the fibers is reduced, the occurrence of lumps (lumps) of cellulose nanofibers can be reduced, and the fibers can be used as an additive. Suitable. Further, since the fluidity is high, it is easy to use even at a high concentration, and there is an advantage that it is easy to use even in an application requiring a high solid content. The lower limit of the aspect ratio is not particularly limited, but is preferably 25 or more, and more preferably 30 or more. When the aspect ratio is 25 or more, the fibrous shape provides an effect of improving thixotropy. The aspect ratio of the carboxymethylated cellulose nanofibers can be controlled by the mixing ratio of the solvent and water at the time of carboxymethylation, the amount of chemicals added, and the degree of carboxymethylation, and can be produced, for example, by a production method described later. ..

For the average fiber diameter and average fiber length of the carboxymethylated cellulose nanofibers, use an atomic force microscope (AFM) when the diameter is 20 nm or less, and a field emission scanning electron microscope (FE-SEM) when the diameter is 20 nm or more. The measurement can be performed by analyzing 200 randomly selected fibers and calculating the average. The aspect ratio can be calculated by the following formula:
Aspect ratio = average fiber length / average fiber diameter.

(Defibration)
The defibration of the cellulose raw material may be performed before or after the modification treatment of the cellulose raw material. Further, the defibration may be performed at one time or a plurality of times. In the case of multiple times, the time of each defibration may be any time.

The device used for defibration is not particularly limited, and examples thereof include high-speed rotary type, colloid mill type, high pressure type, roll mill type, ultrasonic type and the like, and a high pressure or ultrahigh pressure homogenizer is preferable, and a wet high pressure type is preferable. Alternatively, an ultrahigh pressure homogenizer is more preferable. The apparatus preferably can apply a strong shearing force to the cellulose raw material or modified cellulose (usually a dispersion). The pressure that can be applied by the device is preferably 50 MPa or more, more preferably 100 MPa or more, and further preferably 140 MPa or more. The apparatus is preferably a wet high-pressure or ultra-high-pressure homogenizer capable of applying the above pressure to a cellulose raw material or modified cellulose (usually a dispersion) and applying a strong shearing force. As a result, defibration can be performed efficiently.

When the dispersion of the cellulose raw material is defibrated, the solid content concentration of the cellulose raw material in the dispersion is usually 0.1% by mass or more, preferably 0.2% by mass or more, more preferably 0.3. It is mass% or more. As a result, the amount of liquid becomes appropriate with respect to the amount of the cellulose fiber raw material, which is efficient. The upper limit is usually 10% by mass or less, preferably 6% by mass or less. This makes it possible to maintain liquidity.

Prior to defibration (preferably defibration with a high-pressure homogenizer) or, if necessary, a dispersion treatment before defibration, pretreatment may be performed if necessary. The pretreatment may be performed using a mixing, stirring, emulsifying, or dispersing device such as a high-speed shear mixer.

(Dry)
The cellulose nanofibers used in the present invention can be used in the state of a dispersion obtained after defibration, but can also be dried and redispersed in water for use if necessary. The drying method is not limited, but for example, a freeze-drying method, a spray-drying method, a shelf-stage drying method, a drum drying method, a belt drying method, a method of thinly spreading and drying on a glass plate, a fluidized bed drying method, a microwave drying method, and a microwave drying method. Known methods such as the method and the heating fan type vacuum drying method can be used. After drying, it may be crushed with a cutter mill, a hammer mill, a pin mill, a jet mill or the like, if necessary. Further, the method of redispersion in water is not particularly limited, and a known disperser can be used.

The form of the cellulose nanofibers used in the present invention may be in the state of a dispersion liquid or in the form of a powder, but from the viewpoint of excellent workability during the production of confectionery, the cellulose nanofibers are used in the state of a dispersion liquid. Is preferable.

In the present invention, the blending amount of the cellulose nanofibers is preferably 0.01 to 5% by mass, more preferably 0.05 to 3% by mass, still more preferably, based on the wheat flour as a raw material for confectionery. 0.1 to 2% by mass.

The cellulose nanofibers of the present invention may contain other components, if necessary. For example, when producing a powder, it is preferable to coexist a water-soluble polymer with a dispersion of cellulose nanofibers before drying because the redispersibility is improved.

<Water-soluble polymer>
Examples of the water-soluble polymer include cellulose derivatives (carboxymethyl cellulose, methyl cellulose, hydroxypropyl cellulose, ethyl cellulose), xanthan gum, xyloglucane, dextrin, dextran, carrageenan, locust bean gum, alginic acid, alginate, purulan, starch, and sardine powder. Examples thereof include waste powder, corn starch, arabic gum, locust bean gum, gellan gum, polydextrose, pectin, chitin, water-soluble chitin, chitosan, casein, albumin, soybean protein solution, peptone, tamarind gum, guar gum, and the like. Among these, cellulose derivatives are preferable from the viewpoint of affinity with carboxymethylated cellulose nanofibers, and carboxymethyl cellulose and salts thereof are particularly preferable. It is considered that a water-soluble polymer such as carboxymethyl cellulose and a salt thereof penetrates between the carboxymethyl cellulose nanofibers and widens the distance between the nanofibers to improve the redispersibility.

When carboxymethyl cellulose or a salt thereof is used as the water-soluble polymer, it is preferable to use carboxymethyl cellulose having a carboxymethyl group substitution degree of 0.55 to 1.6 per anhydrous glucose unit, and 0.55 to 1. The one of 1 is more preferable, and the one of 0.65 to 1.1 is further preferable. Further, a long molecule (high viscosity) is preferable because it has a high effect of widening the distance between nanofibers. The B-type viscosity of carboxymethyl cellulose in a 1% by mass aqueous solution at 25 ° C. and 60 rpm is preferably 3 mPa · s to 14000 mPa · s, more preferably 7 mPa · s to 14000 mPa · s, and 1000 mPa · s to 8000 mPa · s. More preferred. Since the "carboxymethyl cellulose or a salt thereof" as the water-soluble polymer referred to here is completely soluble in water, the fiber shape can be confirmed in the above-mentioned water. Distinguished from fiber.

The blending amount of the water-soluble polymer is preferably 5% by mass to 300% by mass, more preferably 20% by mass to 300% by mass, and 25% by mass to 25% by mass with respect to the cellulose nanofibers (absolute dry solid content). 200% by mass is more preferable, and 25% by mass to 60% by mass is further preferable.

(Manufacturing method of confectionery)
When blending cellulose nanofibers into a raw material for confectionery in the form of an aqueous dispersion, first, an aqueous dispersion of cellulose nanofibers is prepared. When preparing an aqueous dispersion from the cellulose nanofiber powder, for example, the cellulose nanofiber powder and water may be stirred with a mixer. Next, flour, sugar, milk components, eggs, cellulose nanofiber aqueous dispersion, auxiliary raw materials, etc. are mixed as necessary to prepare the dough, and the obtained dough is heat-treated such as baking, frying, or steaming. By doing so, the confectionery of the present invention can be produced.

Since the confectionery of the present invention contains cellulose nanofibers, it has uniform and fine bubbles, and therefore has an excellent texture. Specific examples of confectionery include dorayaki skin, Imagawayaki skin, taiyaki skin, bun skin, cake, muffin, madeleine, waffle, pancake, busse, castella, donut, and cookies. ..

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

(Measurement method of carboxymethyl substitution)
1) Weigh approximately 2.0 g of carboxymethylated cellulose fiber (absolutely dry) and place it in an Erlenmeyer flask with a 300 mL stopper.
2) Add 100 mL of a solution prepared by adding 100 mL of special grade concentrated nitric acid to 1000 mL of methanol nitrate, and shake for 3 hours to convert the carboxymethyl cellulose salt (CM-modified cellulose) into hydrogen-type CM-modified cellulose.
3) Weigh 1.5 to 2.0 g of hydrogen-type CM-formed cellulose (absolutely dry) and put it in an Erlenmeyer flask with a 300 mL stopper.
4) Wet hydrogen-type CM-formed cellulose with 15 mL of 80% methanol, add 100 mL of 0.1 N NaOH, and shake at room temperature for 3 hours.
5) Using phenolphthalein as an indicator, back titrate excess NaOH with 0.1 N H ₂ SO ₄ .
6) Calculate the carboxymethyl substitution degree (DS) by the following formula:
A = [(100 x F'-(0.1 N H ₂ SO ₄ ) (mL) x F) x 0.1] / (absolute dry mass (g) of hydrogen-type CM-formed cellulose)
DS = 0.162 × A / (1-0.058 × A)
A: 1N NaOH amount (mL) required to neutralize 1 g of hydrogen-type CM-formed cellulose
F': 0.1N H ₂ SO ₄ factor F: 0.1N NaOH factor

(Measuring method of average fiber diameter and aspect ratio)
The average fiber diameter and average fiber length of CNF were analyzed for 200 fibers randomly selected using an atomic force microscope (AFM). The aspect ratio was calculated by the following formula.
Aspect ratio = average fiber length / average fiber diameter

[Example 1]
(Manufacture of carboxymethylated cellulose nanofibers)
200 g of pulp (NBKP (softwood bleached kraft pulp), manufactured by Nippon Paper Industries, Ltd.) and 111 g of sodium hydroxide in dry mass are added to a stirrer capable of mixing pulp, and the pulp solid content is 20% (w). Water was added so as to be / v). Then, after stirring at 30 ° C. for 30 minutes, 216 g (in terms of active ingredient) of sodium monochloroacetate was added. After stirring for 30 minutes, the temperature was raised to 70 ° C. and the mixture was stirred for 1 hour. Then, the reaction product was taken out, neutralized and washed to obtain a carboxymethylated pulp having a carboxymethyl substitution degree of 0.25 per glucose unit. Then, the carboxymethylated pulp is made into a solid content of 1% with water, and defibrated by treating with a high-pressure homogenizer at a pressure of 20 ° C. and 150 MPa five times to defibrate, and an aqueous dispersion of carboxymethylated (CMized) cellulose nanofibers. Got The obtained CM-formed cellulose nanofibers had an average fiber diameter of 5 nm and an aspect ratio of 500. The obtained aqueous dispersion was dehydrated and dried with a drum drying device to obtain a dry solid and then pulverized to obtain a powder of CM-formed cellulose nanofibers.

(Manufacturing of dorayaki skin)
Using a TK homomixer (manufactured by Tokushu Kagaku Kogyo Co., Ltd.), the powder of the CM-modified cellulose nanofibers obtained above was added to the place where water was stirred at 10,000 rpm, and the mixture was stirred for 30 minutes. An aqueous dispersion of 5% by weight of CM-formed cellulose nanofibers was obtained. 33. 3 parts of wheat flour, 70 parts of sugar, 120 parts of egg, 20 parts of oligosaccharide, 10 parts of honey, 6 parts of mirin, 6 parts of baking soda, and the 1.5 mass% CM-modified cellulose nanofiber aqueous dispersion obtained above. 3 parts (0.5 parts of solid content) and 37 parts of water were placed in a stainless beaker, and the dough was adjusted by stirring at 5000 rpm for 5 minutes using a TK homomixer. The dough was heated on a hot plate to produce dorayaki rind.

[Comparative Example 1]
A dorayaki rind was produced in the same manner as in Example 1 except that 33.3 parts of water was placed in a stainless steel beaker instead of the aqueous dispersion of CM-modified cellulose nanofibers.

With respect to the dorayaki skins produced in Example 1 and Comparative Example 1, the state of the dough was visually observed, and the texture and moistness were tasted and evaluated as follows, and the results are shown in Table 1.

<Texture>
Ten panelists were allowed to sample the dorayaki skin, and the texture was evaluated on a scale of 1 to 10 and the average value.
⊚: 8 to 10 points, Δ: 4 to 7 points, ×: 1 to 3

<Moist feeling>
Ten panelists were allowed to sample the dorayaki skin, and the moist feeling was evaluated on a scale of 1 to 10 and the average value.
⊚: 8 to 10 points, Δ: 4 to 7 points, ×: 1 to 3

As shown in Table 1, the dorayaki skin containing the cellulose nanofibers of Example 1 is superior in the workability of the dough as compared with Comparative Example 1 not containing the cellulose nanofibers, and has a texture and a moist feeling. Was also excellent.

Claims (6)

Confectionery containing flour, sugars, milk components, eggs, and cellulose nanofibers. The confectionery according to claim 1, wherein the cellulose nanofibers are anion-modified cellulose nanofibers. The confectionery according to claim 1 or 2, wherein the anion-modified cellulose nanofiber is a cellulose nanofiber having a carboxyl group or a cellulose nanofiber having a carboxylalkyl group. The confectionery according to claim 3, wherein the anion-modified cellulose nanofibers are carboxymethylated cellulose nanofibers having a carboxymethyl substitution degree in the range of 0.01 to 0.50. The confectionery according to any one of claims 1 to 4, further containing carboxymethylated cellulose. The confectionery was selected from the group consisting of dorayaki rind, Imagawayaki rind, taiyaki rind, bun skin, cake, muffin, madeleine, waffle, pancake, busse, castella, donut, and cookie. The confectionery according to any one of claims 1 to 5, which is one kind.