JP2017079600A - Humectant for food product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a humectant for a food product for use in bread that is improved in any texture of a moist feeling, a crispy palate feeling and a melting feeling in the mouth while giving a voluminous feeling and to provide a method for producing the humectant.SOLUTION: The humectant for a food product contains cellulose nanofibers. The humectant for a food product gives a voluminous feeling to food products such as bread, hot cake and the like and improves any texture of a moist feeling, a crispy palate feeling and a melting feeling in the mouth by using chemically modified cellulose nanofibers in particular. The chemically modified cellulose nanofiber is an oxidized cellulose nanofiber containing a carboxyl group in an amount of 0.5-3.0 mmol/g based on the absolute dry weight of the cellulose nanofiber.SELECTED DRAWING: None

Description

  The present invention relates to a humectant for food. Specifically, the present invention relates to a humectant for foods that gives a voluminous feel to breads such as breads and hot cakes, and provides a moist and crisp texture.

  In general, breads (bread, hot cakes, etc.) are mainly made from flour such as flour (including starch and gluten), water, foaming agents (yeast, multi-layer, etc.), salt, eggs, oils and fats, etc. Produced by timely mixing, fermentation, molding, final fermentation, and overheating. The properties required for these foods are voluminous, uniform in appearance, and the inner phase (the cut edge when the bread is cut) is fine and uniform in air bubbles. It is important to be moist, crisp and crisp. As a method for improving this, there are known methods of increasing water absorption using flour containing a lot of gluten, and methods using a large amount of sugars, fats, eggs, emulsifiers, etc. A method containing carboxymethyl cellulose or a salt thereof having a specific degree of substitution of carboxymethyl is disclosed.

JP 2010-226983 A

  However, this method certainly has an improvement effect on the above-mentioned problems, but further improvement has been demanded with respect to crispness and mouth-breaking. Therefore, an object of the present invention is to provide a humectant for bread foods and a method for producing the same, which can improve the texture of moistness, crispness and mouthfeel while giving a sense of volume.

The present invention provides the following.
(1) A humectant for foods containing cellulose nanofibers.
(2) The humectant for food according to (1), wherein the cellulose nanofiber is a chemically modified cellulose nanofiber.
(3) The chemically modified cellulose nanofiber is an oxidized cellulose nanofiber having an amount of carboxyl groups of 0.5 mmol / g to 3.0 mmol / g with respect to the absolute dry weight of the cellulose nanofiber. The food moisturizer according to (2) above.
(4) The chemically modified cellulose nanofiber is a carboxymethylated cellulose nanofiber having a carboxymethyl substitution degree of 0.01 to 0.50 per glucose unit of the cellulose nanofiber (2) ) Moisturizer for food according to the item
(5) The humectant for foods as described in (1) to (4) above, which is used for breads.

According to the present invention, the addition of a moisturizer for foods for breads that, when added, gives a voluminous feel to foods such as breads and hot cakes, and can also improve any of the moist feeling, crispness, and mouthfeel. An agent can be provided. The reason why these effects can be obtained by the food moisturizer for bread of the present invention is not clear, but in the present invention, the cellulose nanofiber which is a food moisturizer has a low shear rate (<0.1 s ^−1). ) Is higher than that of common water-soluble polymers such as carboxymethylcellulose, etc., preventing coalescence of bubbles after foaming due to fermentation, etc., preventing collapse of the bubbles and producing fine bubbles It is presumed that

  The humectant for bread food of the present invention is preferably used for bread food such as bread, hot cakes, etc., and foods that require a sense of volume, moist feeling, crispness, and mouthfeel. It is done.

<Cellulose nanofiber>
The cellulose nanofiber used in the present invention is a fine fiber having an average fiber diameter of about 4 to 500 nm and an average aspect ratio of 50 or more, and can be obtained by defibrating an unmodified or chemically modified cellulose raw material. it can.
The average fiber diameter and average fiber length of cellulose nanofibers can be obtained by averaging the fiber diameter and fiber length obtained from the results of observing each fiber using a field emission scanning electron microscope (FE-SEM). it can. Also, the aspect ratio can be calculated by the following formula:
Aspect ratio = average fiber length / average fiber diameter

  In the present invention, whether the cellulose raw material is unmodified or chemically modified is not particularly limited. Examples of the chemical modification method include oxidation, etherification, phosphorylation, esterification, silane coupling, Although fluorination, cationization, etc. can be performed, it is preferable that it is chemically modified, and among them, oxidation using an N-oxyl compound as a catalyst, oxidation with ozone, or carboxymethylation, preferable.

<Cellulose raw material>
In the present invention, the cellulose raw material may be a plant (for example, wood, bamboo, hemp, jute, kenaf, farmland waste, cloth, pulp (coniferous unbleached kraft pulp (NUKP), coniferous bleached kraft pulp (NBKP), broadleaf tree not yet). Bleached kraft pulp (LUKP), hardwood bleached kraft pulp (LBKP), softwood unbleached sulfite pulp (NUSP), softwood bleached sulfite pulp (NBSP) thermomechanical pulp (TMP), recycled pulp, waste paper, etc.), animals (for example, Squirrels), algae, microorganisms (for example, acetic acid bacteria (Acetobacter)), microbial products, etc. are known, and any of them can be used in the present invention, preferably cellulose fibers derived from plants or microorganisms More preferably, it is a cellulose fiber derived from a plant.

  The fiber diameter of the cellulose fiber raw material used in the present invention is not particularly limited, and the number average fiber diameter is 1 μm to 1 mm. What has undergone general purification is about 50 μm. For example, when a chip or the like having a size of several centimeters is refined, it is preferable to perform a mechanical treatment with a disintegrator such as a refiner or a beater to make it about 50 μm.

<Oxidation>
In the present invention, the oxidation of the cellulose raw material can be performed using a known method, and is not particularly limited, but the amount of carboxyl groups is 0.5 mmol / g with respect to the absolute dry weight of the cellulose nanofiber. It is preferable to adjust so that it may be -3.0 mmol / g.

As an example, it can be obtained by oxidizing cellulose in water using an oxidizing agent in the presence of a compound selected from the group consisting of an N-oxyl compound and a bromide, iodide or a mixture thereof. By this oxidation reaction, the primary hydroxyl group at the C6 position of the glucopyranose ring on the cellulose surface is selectively oxidized, and a cellulose fiber having an aldehyde group and a carboxyl group or a carboxylate group on the surface can be obtained. The concentration of cellulose during the reaction is not particularly limited, but is preferably 5% by mass or less.
The N-oxyl compound refers to a compound that can generate a nitroxy radical. As the N-oxyl compound, any compound can be used as long as it promotes the target oxidation reaction.

The amount of the N-oxyl compound used is not particularly limited as long as it is a catalytic amount that can oxidize cellulose as a raw material. For example, 0.01 to 10 mmol is preferable, 0.01 to 1 mmol is more preferable, and 0.05 to 0.5 mmol is more preferable with respect to 1 g of absolutely dry cellulose. Moreover, about 0.1-4 mmol / L with respect to a reaction system is good.
Bromide is a compound containing bromine, examples of which include alkali metal bromides that can dissociate and ionize in water. Further, an iodide is a compound containing iodine, and examples thereof include alkali metal iodide. The amount of bromide or iodide used can be selected as long as the oxidation reaction can be promoted. The total amount of bromide and iodide is, for example, preferably 0.1 to 100 mmol, more preferably 0.1 to 10 mmol, and still more preferably 0.5 to 5 mmol with respect to 1 g of absolutely dry cellulose.

  As the oxidizing agent, known ones can be used, and for example, halogen, hypohalous acid, halous acid, perhalogen acid or salts thereof, halogen oxide, peroxide and the like can be used. Of these, sodium hypochlorite is preferable because it is inexpensive and has a low environmental impact. The appropriate amount of the oxidizing agent used is, for example, preferably 0.5 to 500 mmol, more preferably 0.5 to 50 mmol, further preferably 1 to 25 mmol, and most preferably 3 to 10 mmol with respect to 1 g of absolutely dry cellulose. . For example, 1-40 mol is preferable with respect to 1 mol of N-oxyl compounds.

The cellulose oxidation process allows the reaction to proceed efficiently even under relatively mild conditions. Therefore, the reaction temperature is preferably 4 to 40 ° C, and may be room temperature of about 15 to 30 ° C. As the reaction proceeds, a carboxyl group is generated in the cellulose, so that the pH of the reaction solution is reduced. In order to advance the oxidation reaction efficiently, an alkaline solution such as an aqueous sodium hydroxide solution is added to maintain the pH of the reaction solution at about 8 to 12, preferably about 10 to 11. The reaction medium is preferably water because it is easy to handle and hardly causes side reactions.
The reaction time in the oxidation reaction can be appropriately set according to the degree of progress of oxidation, and is usually 0.5 to 6 hours, for example, about 0.5 to 4 hours.
The oxidation reaction may be performed in two stages. For example, by oxidizing the oxidized cellulose obtained by filtration after the completion of the first-stage reaction again under the same or different reaction conditions, the efficiency is not affected by the reaction inhibition by the salt generated as a by-product in the first-stage reaction. Can be oxidized well.

  Another example of the carboxylation (oxidation) method is a method of oxidizing by contacting a gas containing ozone and a cellulose raw material. By this oxidation reaction, at least the hydroxyl groups at the 2nd and 6th positions of the glucopyranose ring are oxidized and the cellulose chain is decomposed. The ozone concentration in the gas containing ozone is preferably 50 to 250 g / m 3, and more preferably 50 to 220 g / m 3. The amount of ozone added to the cellulose raw material is preferably 0.1 to 30 parts by mass, and more preferably 5 to 30 parts by mass when the solid content of the cellulose raw material is 100 parts by mass. The ozone treatment temperature is preferably 0 to 50 ° C, and more preferably 20 to 50 ° C. The ozone treatment time is not particularly limited, but is about 1 to 360 minutes, and preferably about 30 to 360 minutes. When the conditions for the ozone treatment are within these ranges, the cellulose can be prevented from being excessively oxidized and decomposed, and the yield of oxidized cellulose is improved. After the ozone treatment, an additional oxidation treatment may be performed using an oxidizing agent. The oxidizing agent used for the additional oxidation treatment is not particularly limited, and examples thereof include chlorine compounds such as chlorine dioxide and sodium chlorite, oxygen, hydrogen peroxide, persulfuric acid, and peracetic acid. For example, these oxidizing agents can be dissolved in a polar organic solvent such as water or alcohol to prepare an oxidizing agent solution, and a cellulose raw material can be immersed in the solution for additional oxidation treatment.

The amount of the carboxyl group, carboxylate group, and aldehyde group of the cellulose fiber can be adjusted by controlling the amount of the oxidizing agent added and the reaction time.
The method for measuring the amount of carboxyl groups is, for example, preparing 60 ml of a 0.5 mass% slurry (aqueous dispersion) of oxidized cellulose, adding 0.1 M hydrochloric acid aqueous solution to pH 2.5, and then adding 0.05 N sodium hydroxide. The electrical conductivity was measured by dropping the aqueous solution until the pH reached 11, and the amount was calculated from the amount of sodium hydroxide (a) consumed in the neutralization step of the weak acid where the change in electrical conductivity was slow, using the following formula: can do:
Carboxyl group amount [mmol / g oxidized cellulose or cellulose nanofiber] = a [ml] × 0.05 / oxidized cellulose mass [g].

<Carboxymethylation>
In the present invention, the carboxymethylation of the cellulose raw material can be carried out using a known method and is not particularly limited. However, the degree of carboxymethyl group substitution per anhydroglucose unit of cellulose is 0.01-0. It is preferable to adjust to 50. As an example, the following production method can be mentioned, but it may be synthesized by a conventionally known method or a commercially available product may be used. Cellulose is used as the starting material, and water and / or lower alcohol 3 to 20 times by weight in the solvent, specifically methanol, ethanol, N-propyl alcohol, isopropyl alcohol, N-butanol, isobutanol, tertiary butanol, etc. Or a mixed medium of two or more. The mixing ratio of the lower alcohol is 60 to 95% by weight. As the mercerizing agent, 0.5 to 20 times moles of alkali metal hydroxide, specifically sodium hydroxide or potassium hydroxide is used per anhydroglucose residue of the bottoming material. A bottoming raw material, a solvent, and a mercerizing agent are mixed and subjected to mercerization treatment 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. Thereafter, a carboxymethylating agent is added in an amount of 0.05 to 10.0 times mol per glucose residue, a reaction temperature of 30 to 90 ° C., preferably 40 to 80 ° C., and a reaction time of 30 minutes to 10 hours, preferably 1 hour. Perform etherification reaction for ~ 4 hours.

As a measuring method of the carboxymethyl substitution degree per glucose unit, it can obtain by the following method, for example. That is, 1) About 2.0 g of carboxymethylated cellulose fiber (absolutely dry) is precisely weighed and put into a 300 mL conical stoppered Erlenmeyer flask. 2) Add 100 mL of a solution of 100 mL of special concentrated nitric acid to 1000 mL of nitric acid methanol and shake for 3 hours to convert the carboxymethyl cellulose salt (CM cellulose) into hydrogenated CM cellulose. 3) Weigh accurately 1.5 to 2.0 g of hydrogenated CM-modified cellulose (absolutely dry) and put into a 300 mL conical flask with a stopper. 4) Wet the hydrogenated CM cellulose with 15 mL of 80% methanol, add 100 mL of 0.1N NaOH, and shake at room temperature for 3 hours. 5) Back titrate excess NaOH with 0.1 N H2SO4 using phenolphthalein as indicator. 6) The degree of carboxymethyl substitution (DS) is calculated by the following formula:
A = [(100 × F ′ − (0.1N H 2 SO 4) (mL) × F) × 0.1] / (absolute dry mass of hydrogenated CM-modified cellulose (g))
DS = 0.162 × A / (1−0.058 × A)
A: 1N NaOH amount (mL) required for neutralizing 1 g of hydrogenated CM-modified cellulose
F ′: 0.1N H 2 SO 4 factor F: 0.1 N NaOH factor

<Defibration>
In the present invention, an apparatus for defibrating is not particularly limited, but a strong shearing force is applied to the aqueous dispersion using an apparatus such as a high-speed rotation type, a colloid mill type, a high pressure type, a roll mill type, or an ultrasonic type. Is preferred. In particular, for efficient defibration, it is preferable to use a wet high-pressure or ultrahigh-pressure homogenizer that can apply a pressure of 50 MPa or more to the aqueous dispersion and can apply a strong shearing force. The pressure is more preferably 100 MPa or more, and further preferably 140 MPa or more. In addition, prior to defibration / dispersion treatment with a high-pressure homogenizer, the cellulose nanofibers may be pretreated using a known mixing, stirring, emulsifying, and dispersing device such as a high-speed shear mixer as necessary. Is also possible.

  In the case of defibration by the above treatment, the solid content concentration as the cellulose fiber raw material is 0.1% by weight or more, preferably 0.2% by weight or more, particularly 0.3% by weight or more, and 10% by weight or less, particularly 6%. It is preferable that it is below wt%. When the solid content concentration is too low, the amount of liquid is too large with respect to the amount of the cellulose fiber raw material to be processed, resulting in poor efficiency, and when the solid content concentration is too high, the fluidity is deteriorated.

  In the present invention, breads are mainly flour such as wheat flour (including starch and gluten), yeast, salt and water, and added with auxiliary materials such as sugars, dairy products, egg products and edible fats and oils, and kneading This refers to products made by fermentation, molding, baking, steaming, frying, etc., and breads such as pullman, French breads such as table rolls, baguettes, and batar, rolls such as sweet rolls and table rolls And confectionery breads such as croissants, Danish pastries and yeast donuts.

<Addition to food>
In the present invention, the form in which chemically modified cellulose nanofibers are contained in breads is not particularly limited, and a dispersion of cellulose nanofibers or a dry solid thereof, or a wet solid in an intermediate state thereof, or What is necessary is just to mix the cellulose nanofiber of a well-known form, such as the liquid mixture of the cellulose nanofiber and water-soluble polymer, its dry solid, or the wet solid which is the intermediate state. From the viewpoint of redispersibility, it is more preferable to mix with a water-soluble polymer.
The content of the humectant for food of the present invention in the food is 0.05 with respect to the total dry weight of the cereal classification in which the dry weight of cellulose nanofibers in the humectant for food is the main ingredient of breads. It is preferable that the content is not less than wt%, preferably not less than 0.1 wt%. If the content is less than 0.05 weight, sufficient texture improvement effect is not exhibited.

  When a cellulose nanofiber and a water-soluble polymer are mixed and used, examples of the water-soluble polymer include cellulose derivatives (carboxymethyl cellulose, methyl cellulose, hydroxypropyl cellulose, ethyl cellulose), xanthan gum, xyloglucan, dextrin, dextran, carrageenan. , Locust bean gum, alginic acid, alginate, pullulan, starch, hard starch, kudzu powder, positive starch, phosphorylated starch, corn starch, gum arabic, locust bean gum, gellan gum, gellan gum, polydextrose, pectin, chitin, water-soluble chitin, Chitosan, casein, albumin, soy protein lysate, peptone, polyvinyl alcohol, polyacrylamide, sodium polyacrylate, polyvinylpyrrolidone, polyvinegar Vinyl, polyamino acid, polylactic acid, polymalic acid, polyglycerin, latex, rosin sizing agent, petroleum resin sizing agent, urea resin, melamine resin, epoxy resin, polyamide resin, polyamide / polyamine resin, polyethyleneimine, polyamine, plant Mention may be made of gums, polyethylene oxides, hydrophilic cross-linked polymers, polyacrylates, starch polyacrylic acid copolymers, tamarind gum, gellan gum, pectin, guar gum and colloidal silica and mixtures of one or more thereof. Among these, it is preferable from a compatible point to use carboxymethylcellulose and its salt.

  It is preferable that the compounding quantity of water-soluble polymer is 5 to 50 weight% with respect to the absolutely dry solid content of a cellulose nanofiber. If it is less than 5% by weight, the effect of sufficient redispersibility is not exhibited. On the other hand, when it exceeds 50% by weight, problems such as viscosity characteristics and dispersion stability, which are characteristic of cellulose nanofiber, occur.

  The dehydration / drying method of the dispersion of cellulose nanofibers or the mixture of cellulose nanofibers and water-soluble polymer may be any conventionally known method such as spray drying, pressing, air drying, hot air drying, and vacuum. Drying can be mentioned. Examples of the drying apparatus specifically used in the method of the present invention are as follows. That is, continuous tunnel dryer, band dryer, vertical dryer, vertical turbo dryer, multi-stage disk dryer, aeration dryer, rotary dryer, air dryer, spray dryer dryer, spray dryer , Cylindrical dryers, drum dryers, screw conveyor dryers, rotary dryers with heating tubes, vibration transport dryers, batch-type box dryers, aeration dryers, vacuum box dryers, stirring dryers, etc. These drying apparatuses can be used alone or in combination of two or more. Among these, it is preferable to use a drum drying apparatus from the viewpoint of energy efficiency because the heat energy is uniformly supplied directly to an object to be dried. The drum drying apparatus is also preferable in that it can immediately collect a dried product without applying heat more than necessary.

  Hereinafter, although an example is given and the present invention is explained still in detail, the present invention is not limited to these.

<Manufacture of oxidized cellulose nanofiber>
Add 500 g of bleached unbeaten kraft pulp (whiteness 85%) derived from coniferous trees (absolutely dry) to 500 ml of an aqueous solution in which 780 mg of TEMPO (Sigma Aldrich) and 75.5 g of sodium bromide are dissolved, until the pulp is uniformly dispersed Stir. An aqueous sodium hypochlorite solution was added to the reaction system to 6.0 mmol / g to initiate the oxidation reaction. During the reaction, the pH in the system was lowered, but a 3M sodium hydroxide aqueous solution was sequentially added to adjust the pH to 10. The reaction was terminated when sodium hypochlorite was consumed and the pH in the system no longer changed. The reaction mixture was filtered through a glass filter to separate the pulp, and the pulp was sufficiently washed with water to obtain oxidized pulp (carboxylated cellulose). The pulp yield at this time was 90%, the time required for the oxidation reaction was 90 minutes, and the amount of carboxyl groups was 1.6 mmol / g.

  The oxidized pulp obtained in the above step was adjusted to 1.0% (w / v) with water and treated three times with an ultrahigh pressure homogenizer (20 ° C., 150 MPa) to obtain a cellulose nanofiber dispersion. The obtained fiber had an average fiber diameter of 3 nm and an aspect ratio of 250.

<Production of carboxymethylated cellulose nanofiber>
In a stirrer that can mix pulp, 200 g dry pulp (NBKP (conifer bleached kraft pulp), manufactured by Nippon Paper Industries Co., Ltd.) and 111 g sodium hydroxide dry mass are added, and the pulp solid content is 20% (w / v Water was added so that Thereafter, after stirring at 30 ° C. for 30 minutes, 216 g of sodium monochloroacetate (in terms of active ingredient) was added. After stirring for 30 minutes, the temperature was raised to 70 ° C. and stirred for 1 hour. Thereafter, 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. Thereafter, the carboxymethylated pulp was made 1% solids with water, and fibrillated by treating it with a high-pressure homogenizer 5 times at 20 ° C. and 150 MPa to obtain carboxymethylated cellulose fibers. The obtained fiber had an average fiber diameter of 15 nm and an aspect ratio of 50.

<Example 1>
Carboxymethylcellulose (trade name: F350HC-4) is added to 0.7% by weight aqueous suspension of the above oxidized cellulose nanofibers with respect to the cellulose nanofibers, and is added with a TK homomixer (12,000 rpm). Stir for 60 minutes. To this aqueous suspension, 0.5% aqueous sodium hydroxide solution was added to adjust the pH to 9, and then the vapor pressure was 0.5 MPa. G, and dried with a drum dryer D0405 (Katsuragi Industry Co., Ltd.) with a drum rotation speed of 2 rpm to obtain a mixed dry solid of cellulose nanofibers and carboxymethylcellulose having a water content of 5% by weight. The dried solid was pulverized with a dry mill to obtain a humectant for food of the present invention.
Next, bread was produced by the following method (medium seed method).

(1) Weigh the materials of medium seed and main shell as shown in Table 1 below.
(2) Separately weigh 1/2 water from water that has been weighed and adjusted in temperature, and add yeast.
(3) Put the remaining water into the mixer and put all the ingredients except the yeast into the mixer. Thereafter, the dissolved yeast is added.
(4) Mix for about 4 minutes.
(5) The middle seed is fermented for 4 hours under conditions of a temperature of 27 to 28 ° C. and a humidity of 75%.
(6) Mix for 8 minutes.
(7) Put in the weight and take the floor time for about 30 minutes, then divide the dough into 3 pieces at 235g and 3 pieces at 200g.
(8) Easily round and put in the weight and take a bench time for 30 minutes.
(9) Degas the dough and put the rolled dough into the food mold.
(10) Final fermentation for about 1 hour under conditions of temperature 35 ° C. and humidity 85% in a fermentation room.
(11) Bake in a steam convection oven at 170 ° C. for 25 minutes.

After the production, as an evaluation of the volume feeling, the height of bread was measured, and the case where no cellulose nanofiber was added (Comparative Example 1) was evaluated as a percentage. In addition, as an evaluation of the texture, the following five-step evaluation (good 5 to 1 inferior) was performed by 8 panelists for the moist feeling, crispness, and dry mouth 4 hours after production, and the average was taken.
[Moist feeling]
5: Extremely moist 4: Moist 3: Slightly puffy 2: Slightly puffy 1: Remarkably puffy
[Breaking teeth]
5: Very good crisp 4: Good crisp 3: Bad crisp, slightly attached to teeth 2: Bad crisp, slightly attached to teeth 1: Bad crisp, noticeably attached to teeth
[Speaking]
5: Extremely good mouthfeel 4: Good mouthfeel 3: Bad mouthfeel, slightly lumpy 2: Slightly mouthfeel, slightly lumpy 1: Slightly mouthfeel, lumpy is there

<Example 2>
It carried out similarly to Example 1 except having changed the cellulose nanofiber into the carboxymethylated cellulose nanofiber manufactured by said method.

<Comparative Example 1>
It carried out like Example 1 except not having mixed cellulose nanofiber.

<Comparative example 2>
It carried out like Example 1 except having changed the cellulose nanofiber into carboxymethylcellulose (Sunrose SLD-F1. Nippon Paper Industries Co., Ltd.).

  As is apparent from the results in Table 2, in Examples 1 and 2 containing cellulose nanofibers, the volume feeling and various textures are clearly improved as compared to Comparative Example 1 not containing cellulose nanofibers. I understand. Moreover, although the volume feeling is equivalent with respect to the comparative example 2 which added the carboxymethylcellulose instead of the cellulose nanofiber, it turns out that crispness and a mouth-feeling are improving among food textures.

Claims (5)

  A humectant for foods containing cellulose nanofibers.   The humectant for food according to claim 1, wherein the cellulose nanofiber contains chemically modified cellulose nanofiber.   The chemically modified cellulose nanofiber is an oxidized cellulose nanofiber having an amount of carboxyl groups of 0.5 mmol / g to 3.0 mmol / g with respect to an absolute dry weight of the cellulose nanofiber. Item 3. A humectant for food according to Item 2.   The chemically modified cellulose nanofiber according to claim 2, wherein the cellulose nanofiber is a carboxymethylated cellulose nanofiber having a degree of carboxymethyl substitution per glucose unit of 0.01 to 0.50. A moisturizer for food.   The humectant for food according to claim 1, which is used for breads.