CIP CLEANING AGENT COMPOSITION AND METHOD OF CLEANING THEREWITH

Abstract

 The present invention is to provide a CIP cleaning agent composition for effectively removing flavor adhered to production equipment for food and beverages, in particular flavor adhered to packing and the like, the agent having low foaming ability and being capable of conducting the two processes of acid cleaning and deodorizing in one step, and a cleaning method using such an agent.
The CIP cleaning agent composition comprises 0.005-30.0 wt.% of one or a plurality of compounds selected from a group including a fatty acid, an ethercarboxylic acid, a diglyceride or trigyceride, and a fatty acid ester represented by specific general formulas, additionally 0.01 wt.% or more of an inorganic acid and/or organic acid, and optionally 0.005-30.0 wt.% of a solubilizing agent (all calculated as pure components).

Description

TECHNICAL FIELD

[0001] The present invention relates to a CIP (cleaning-in-place) cleaning agent composition with low foaming ability which is suitable for effectively removing flavors adhered to a production equipment for various beverages or food, in particular, flavors adhered to packing or the like. The present invention also relates to a CIP cleaning agent composition with low foaming ability which makes it possible to conduct the two processes of acid cleaning and deodorizing in one step by introducing various acids into the aforementioned cleaning agent composition.

BACKGROUND ART

[0002] Reflecting the diversification of tastes in recent years, a large number of beverages and food products (referred to hereinbelow as "beverages") using various flavors have been produced. However, because the beverages of this type have a flavor odor, this flavor odor strongly adheres to the production equipment, in particular, packing or the like, and the elimination of this flavor odor becomes a serious problem.

[0003] A method comprising using acidic or alkaline cleaning agents and repeatedly conducting deodorization and cleaning and a method comprising the steps of conducting the aforementioned repeated deodorization and cleaning, and then conducting deodorization treatment by inducing circulation contact with a tea extract or an oxidizing agent such as sodium hypochlorite, peracetic acid, percarbonic acid, and the like, have been used as a technology for eliminating the flavor odor. However, a complete deodorization effect could not be achieved even when such cleaning or deodorization was employed.

[0004] Furthermore, a deodorizing agent composition for CIP cleaning comprising a specific nonionic surfactant, such as peroxyalkylene fatty acid ester, as the main component has also been known (Japanese Patent Application Laid-open No. 2003-49193). That composition causes little damage of the production equipment, has low foaming ability, and also demonstrates deodorizing ability, but the deodorizing effect thereof is low.

DISCLOSURE OF THE INVENTION

[0005] It is an object of the present invention to obtain a CIP (cleaning-in-place) cleaning agent composition with low foaming ability which is suitable for effectively removing flavors adhered to a production equipment for various beverages or food, in particular, flavors adhered to packing or the like.

[0006] Another object of the present invention is to obtain a CIP (cleaning-in-place) cleaning agent composition which makes it possible to conduct the two processes of acid cleaning and deodorizing in one step by introducing various acids into the aforementioned cleaning agent composition. The present invention also provides a cleaning method in which the two processes of acid cleaning and deodorizing are conducted in one step by using such CIP (cleaning-in-place) cleaning agent compositions.

[0007] The CIP cleaning agent composition in accordance with the present invention (can be also referred to hereinbelow as cleaning agent composition) comprises as an A component one or a plurality of compounds selected from a group including a fatty acid represented by Formula (1), an ethercarboxylic acid represented by Formula (2), a diglyceride or trigyceride represented by Formula (3) and a fatty acid ester represented by Formula (4) shown below in an amount of 0.005-30.0 wt.%, calculated as a pure component, or this composition additionally containing as a B component an inorganic acid and/or organic acid in an amount of 0.01 wt.% or more, and/or as a C component a solubilizing agent in an amount of 0.005-30.0 wt.%, calculated as a pure component.







(where R is a C₅-C₂₁ alkyl group or alkenyl group or a C_7-C₁₉ alkylallyl group or alkenylallyl group; E is an ethylene group, n is integer of 0 to 10; m is 1 or 2; Each of R₁, R₂, and R₃ is a hydrogen atom or a C₆-C₂₂ saturated or unsaturated acyl group, wherein at least two of R₁, R₂, and R₃ are C₆-C₂₂ saturated or unsaturated acyl groups. R₄ is a C₉-C₂₁ alkyl group or alkenyl group. R₅ is a C₁-C₂₂ alkyl group or alkenyl group).

[0008] Because the cleaning agent composition in accordance with the present invention contains one or a plurality of compounds represented by Formulas (1), (2), (3), and (4) above in an amount of 0.005-30.0 wt.%, calculated as pure components, flavors adhered to a production equipment for various beverages or food, in particular, flavors adhered to packing or the like, can be effectively removed. Furthermore, excellent defoaming ability is demonstrated.

[0009] Further, in accordance with the present invention, introducing various acids into the above-described cleaning agent composition makes it possible to conduct the two processes of acid cleaning and deodorizing in one step.

BEST MODE FOR CARRYING OUT THE INVENTION

[0010] The present invention will be described below in greater detail.

[0011] The compounds of Formula (1), (2), (3), or (4) serving as an A component used in accordance with the present invention demonstrate a deodorizing effect that effectively removes flavors during cleaning. The compounds of Formulas (1) to (4) will be described below.







(where R is a C₅-C₂₁ alkyl group or alkenyl group or a C_7-C₁₉ alkylallyl group or alkenylallyl group; E is an ethylene group, n is integer of 0 to 10; m is 1 or 2; Each of R₁, R₂, and R₃ is a hydrogen atom or a C₆-C₂₂ saturated or unsaturated acyl group, wherein at least two of R₁, R₂, and R₃ are C₆-C₂₂ saturated or unsaturated acyl groups. R₄ is a C₉-C₂₁ alkyl group or alkenyl group. R₅ is a C₁-C₂₂ alkyl group or alkenyl group).

[0012] Specific examples of fatty acids represented by Formula

(1) include caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, palmitoleic acid, oleic acid, linoleic acid, linolenic acid, and undecylenic acid. Those acids can be used individually or in combinations of two or more thereof.

[0013] Specific examples of ether carboxylic acids represented by Formula (2), which are used in accordance with the present invention, include polyoxyethylene (n = 0-10) octyl ether acetic acid, polyoxyethylene (n = 0-10) decyl ether acetic acid, polyoxyethylene (n = 0-10) lauryl ether acetic acid, polyoxyethylene (n = 0-10) myristyl ether acetic acid, and polyoxyethylene (n = 0-10) oleyl ether acetic acid. They too can be used individually or in combinations of two or more thereof.

[0014] Food cooking oils can be used as the diglycerides represented by Formula (3), which are used in accordance with the present invention. Specific examples of triglycerides represented by Formula (3) include corn oil, safflower oil, sunflower oil, olive oil, cotton oil, rice oil, rapeseed oil, palm oil, arachis oil, coconut oil, and soybean oil. They too can be used individually or in combinations of two or more thereof.

[0015] Specific examples of fatty acid esters represented by Formula (4), which are used in accordance with the present invention, include oleic acid ethyl ester, oleic acid oleyl ester, myristic acid isopropyl ester, and palmitic acid isopropyl ester. They too can be used individually or in combinations of two or more thereof.

[0016] The content of the compounds represented by Formula (1), (2), (3), or (4) in the cleaning agent composition is 0.005-30.0 wt.%, preferably 0.01-5.0 wt.%, more preferably 0.05-2.0 wt.%, calculated as pure components. When the amount used is less than 0.005 wt.%, flavor cannot be completely removed. On the other hand, if the amount used is more than 30.0 wt.%, the increase in flavor removal effect cannot be expected.

[0017] Furthermore, in accordance with the present invention, the inorganic acid and/or organic acid as a B component is introduced in an amount of 0.01 wt.% or more, preferably 0.01-10 wt.%, calculated as pure components, to the above-described cleaning agent composition comprising the prescribed amounts of the compounds represented by Formula (1), (2), (3), or (4). As a result, the two processes of acid cleaning and deodorizing can be conducted in one step. If the content is less than 0.01 wt.%, the acid cleaning effect cannot be obtained, and when the amount used is more than 10 wt.%, the increase in flavor removal effect cannot be expected.

[0018] Examples of suitable inorganic acids include sulfamic acid, phosphoric acid, nitric acid, sulfuric acid, and hydrochloric acid, and examples of organic acids (however, excluding higher fatty acids) include formic acid, acetic acid, hydroacetic acid, fumaric acid, maleic acid, malonic acid, adipic acid, succinic acid, lactic acid, tartaric acid, citric acid, malic acid, and heptanic acid. They too can be used individually or in combinations of two or more thereof.

[0019] Furthermore, in accordance with the present invention, a solubilizing agent can be also introduced into the cleaning agent composition comprising the prescribed amounts of the compounds represented by Formula (1), (2), (3), or (4) or a cleaning agent composition obtained by additionally introducing thereto the inorganic acid and/or organic acid. The solubilizing agent as a C component is a substance for solubilizing each component in the cleaning agent composition. It also provides an effect slightly increasing the deodorizing capability. Specific examples of such substances include anionic surfactants, solvents benzoic acid, paratoluenesulfonic acid, metaxylene sulfonic acid, cumenesulfonic acid, and alkali metal salts of those acids. Specific examples of anionic surfactants include alkylsulfuric acids, alpha-olefinsulfonic acids, alkylphosphoric acid esters and salts, dialkylsulfosuccinic acid esters and salts, polyoxyethylene alkyl ether sulfates, polyoxyethylene alkylphenyl ether sulfates, polyoxyethylene alkyl ether phosphates, N-lauroylsarcosine salt, oleylsarcosine salt, polyoxyethylene fatty acid amino ether sulfate, alkyl diphenyl ether disulfonates. Examples of solvents include ethanol, ethylene glycol, propylene glycol, hexylene glycol, and butyl cellosolve.

[0020] The content of those solubilizing agents in the cleaning fluid is 0.005-30.0 wt.%, calculated as pure components. When the content is less than 0.005 wt.%, complete solubilizing cannot be attained, and when the amount is more than 30.0 wt.%, additional solubilizing cannot be expected and such an amount is cost-inefficient.

[0021] Further, if necessary, the cleaning agent composition is prepared as diluted cleaning fluid with acidic pH by adding together with the acid components to tap water. The circulation contact with this diluted cleaning solution makes it possible to provide a cleaning method in which the two processes of acid cleaning and deodorizing that have been conventionally conducted in several steps are conducted in one step.

[0022] Further, the diluted cleaning fluid can be also used for cleaning disassembled components of machines used in the process for the manufacture of various food products and beverages by hand cleaning with a sponge, a scrubber, a brush, or the like. It is also suitable for high-pressure cleaning machines.

[0023] In the above-described cleaning method, the content of the A component in the diluted cleaning fluid is preferably 100 mg/1000 mL or higher. In the case of strong odor or according to the type of operation conditions, the diluted cleaning fluid is preferably prepared so that the concentration is 100 mg/1000 mL or higher. From the standpoint of cost efficiency, a range of 100-5000 mg/1000 mL is especially preferred.

Working Example 1

[0024] Samples 1 to 23 (samples in accordance with the present invention) shown in Table 1 were prepared. In the compositions presented in Table 1, oleic acid as a fatty acid of Formula (1) was manufactured by Japan Oils and Fats Co., Ltd., linoleic acid was manufactured by Kanto Chemical Co., Ltd., and caprylic acid was manufactured by Kyowa Hakko Kogyo K. K. Further, polyoxyethylene (3.0) oleyl ether acetic acid as the ether carboxylic acid of Formula (2) was "Buryte OCA30NH" manufactured by Sanyo Chemicals Co., Ltd., polyoxyethylene (4.0) lauryl ether acetic acid was "Buryte LCA40NH" manufactured by Sanyo Chemicals Co., Ltd., and polyoxyethylene (5.0) myristyl ether acetic acid was "Buryte MCA-50NH". Further, sunflower oil as the triglyceride of Formula (3) was "Food Sunflower Oil" manufactured by Showa Kogyo K. K., and olive oil was "Olitera Pure Olive Oil" manufactured by Showa Kogyo K. K. A commercial food cooking oil was used as the diglyceride of Formula (3). This food cooking oil comprises about 80% diglyceride (diacyl glycerol). Further, an oleic acid ethyl ester was used as the fatty acid ester of Formula (4).

[0025] Referring to Table 1, a flavored test piece for a deodorizing test was prepared in the manner as follows. First, an EPDM packing (EX15PKG manufactured by Hisaka Seisakusho K. K.) was cut to a length of 40 mm. Then, the cut pieces were completely immersed into an apple beverage or sports beverage and heated for 8 h at a temperature of 95°C. The cut pieces were then taken out, cleaned for 5 min with a water flow at a temperature of 60°C, and dried at room temperature, thereby providing flavored test pieces.

[0026] The test pieces thus obtained were placed by one piece in 200 mL of each sample of samples No. 1 to 23 shown in Table 1 and stirring was conducted for 20 min, while the temperature was maintained at 70°C. Then, the flavored test pieces were taken out, cleaned for 20 min with a water flow at a temperature of 60°C, and dried at room temperature, followed by odor evaluation of flavor odor.

[0027] In the odor evaluation, the flavor odor of each test piece was evaluated by 5 grades based on the odor test conducted by a panel of 10 people. The evaluation criteria for the odor were as follows. 1: no flavor odor, 2: slight flavor odor; 3: certain flavor odor; 4: strong flavor odor; 5: very strong flavor odor. The results with an evaluation criterion of 2.5 or less were considered good. The results obtained are shown in Table 1.

[0028] Further, 50 mL of each sample of samples No. 1 to 23 shown in Table 1 was sampled in a Nessler tube with a capacity of 100 mL and shaken vigorously in the vertical direction at a temperature of 70°C. The sample was then immediately transferred to a thermostat at a temperature of 70°C, and the amount of foam after 5 min was measured. The evaluation criteria were as follows. O: the amount of foam produced is 0-9 mL, Δ: the amount of foam produced is 10-20 mL, X: the amount of foam produced is 20 mL or more. The results with evaluation criteria O and Δ were considered to correspond to good antifoaming effect. The results obtained are shown in Table 1.

[0029] Table 1 demonstrates that all the samples No. 1 to 23 that contained individually or in combinations the compounds represented by Formula (1), (2), (3), or (4) in an amount of 0.005-30.0 wt.% had good deodorizing ability with respect to flavored test pieces of apple beverage A or sports beverage B and low foaming ability.

Working Example 2

[0030] Samples 24 to 33 (samples in accordance with the present invention) shown in Table 2 were prepared. In the compositions presented in Table 2, oleic acid and linoleic acid as fatty acids of Formula (1) were identical to those of Working Example 1. Caprylic acid and capric acid were manufactured by Kyowa Hakko Kogyo K. K. Further, the ether carboxylic acid of Formula (2), diglyceride or triglyceride of Formula (3), and fatty acid ester of Formula (4) were identical to those of Working Example 1. Further, 75% phosphoric acid manufactured by Tosoh K. K., 67.5% nitric acid manufactured by Asahi Chemical Industries co., Ltd., and sulfamic acid manufactured by Nissan Chemical Industries ("Sulfamic Acid") were used as the inorganic acids, and hydroxyacetic acid manufactured by Otsuka Chemical Co., Ltd. ("Glycolic Acid"), citric acid manufactured by Fuso Chemical Co., Ltd. ("Citric Acid (crystals)", malic acid manufactured by Fuso Chemical Co., Ltd. ("DL-malic acid"). The deodorizing ability test and antifoaming ability test mentioned in Table 2 were conducted in the same manner as in Working Example 1.

[0031] Further, a calcium carbonate dissolution ability test was conducted in the following manner as an acid cleaning effect test with respect to samples No. 24-33 shown in Table 2. A total of 5.00 g of calcium carbonate capable of precipitation was sampled in a conical beaker with a capacity of 200 mL, and 100 mL of each sample was added thereto. After fixed-rate stirring conducted for 5 min at 20°C the samples were allowed to stay for 10 min and the top light layer of 50 mL was filtered. The amount of calcium in the filtrate was determined by titration with an EDTA standard solution and a NN titrate. The evaluation criteria were as follows. O symbol: the amount of dissolved calcium carbonate per 1000 mL of sample solution is 100 mg or more; Δ symbol: the amount of dissolved calcium carbonate per 1000 mL of sample solution is 5-100 mg; and X symbol: the amount of dissolved calcium carbonate per 1000 mL of sample solution is less than 5 mg. The results with evaluation criteria O and Δ were considered to correspond to good effect.

[0032] Table 2 shows that samples No. 24 to 33 also demonstrate good deodorizing effect with respect to the test pieces flavored with apple beverage and have low foaming ability, similarly to the samples tested in Working Example 1. Furthermore, all those samples contained 0.01 wt.% or more of inorganic acid or organic acid. As a result, they demonstrated good calcium carbonate dissolution ability and the two processes of acid cleaning and deodorizing could be conducted in one step. Therefore, the cleaning agent composition in accordance with the present invention is suitable for removing and cleaning flavors adhered to food production equipment and packing in CIP installations.

Working Example 3

[0033] Samples 34 to 53 (samples in accordance with the present invention) shown in Table 3 were prepared. In the compositions presented in Table 3, the fatty acids of Formula (1), ether carboxylic acid of Formula (2), diglyceride or triglyceride of Formula (3), fatty acid ester of Formula (4), and were identical to those of Working Example 2. Further, a polyoxyethylene alkyl ether phosphate "Phosphanol RA600" manufactured by Toho Chemical Industrial Co., Ltd., alphaolefin sulfonate "Lipolan LB-840" manufactured by Lion Co., Ltd., sodium metaxylene sulfonate manufactured by Teikoku Chemical Industries Co., Ltd. ("Taycatox N1140"), sodium paratoluene sulfonate manufactured by Kyowa Hakko Co., Ltd., hexylene glycol manufactured by Dow Chemical Co., Ltd., and ethanol as a grade one reagent manufactured by Koso Chemical Co., Ltd. were used.

[0034] The deodorizing ability test, antifoaming ability test, and calcium dissolution test mentioned in Table 3 were conducted in the same manner as in Working Example 2. Further, a solution stability test was conducted by adding 100 mL of each sample of samples No. 34 to 53 to a conical beaker with a capacity of 200 mL and stirring vigorously with a stirrer. The evaluation criteria were as follows. O symbol: good emulsification ability, Δ symbol: dispersion, X symbol: separation during stirring. The O symbol and Δ symbol corresponded to good results.

[0035] Table 3 shows that all the samples No. 34 to 53 in accordance with the present invention demonstrated excellent deodorizing ability, antifoaming ability, calcium dissolution ability and also excellent solution stability.

Comparative Examples

[0036] Samples No. 54 to 70 (samples of comparative examples) shown in Table 4 were prepared. The samples were subjected to the deodorizing ability test, antifoaming ability test, and calcium dissolution ability test in the same manner as described above. In addition to the above-described tests, samples No. 54 to 61, 69, and 70 were also tested with respect to solution stability. The results obtained are shown in Table 4.

[0037] Table 4 demonstrates the following. With sample No. 54 which had the content of oleic acid of Formula (1) of 0.001 and samples No. 56, 58, 69, and 70 which had the content of ethercarboxylic acid of Formula (2) and triglyceride of Formula (3) of 0.001 wt.% each the deodorizing ability test results were as low as 4.4, 4.7, 4.5, and 4.3, respectively, and the flavor odor was correspondingly strong. Samples No. 55, 57, and 59 contained the compounds represented by Formulas (1), (2), and (3) in respective amounts of 40.0% and also contained 0.2% inorganic acid or organic acid. Furthermore, they also contained a solubilizing agent. Therefore, good numerical values were obtained as the test results. However, good numerical values could be also obtained when the compounds represented by Formulas (1), (2), and (3) were present in an amount of 30.0% or less and it is not necessary to increase this amount to 40%.

[0038] Further, samples No. 62 to 68 contained none of the compounds represented by Formulas (1), (2), (3), and (4). Accordingly poor results were obtained in the deodorizing ability test. Among them, samples No. 62 to 64, 69, and 70 contained an acid and though the deodorizing ability thereof was poor, they demonstrated good results with respect to antifoaming ability and calcium dissolution ability. By contrast, samples No. 65 to 68 that contained an antioxidant instead of the acid demonstrated good results only in the antifoaming ability test, and both the deodorizing ability and the calcium dissolution ability of the samples were poor.

INDUSTRIAL APPLICABILITY

[0039] The cleaning agent composition in accordance with the present invention comprises the compounds represented by Formulas (1), (2), (3), and (4) above in the prescribed quantities. Therefore, it can be used for effectively removing flavors adhered to production equipment for various beverages and food products and for cleaning a variety of food production equipment as a CIP cleaning agent composition.

[0040] Further, introducing organic acids or inorganic acids into the cleaning fluid of the cleaning agent composition in accordance with the present invention makes it possible to conduct the two processes of acid cleaning and deodorizing in one step, while suppressing foam generation, and such an agent, as mentioned above, can be used for cleaning a variety of food production equipment as a CIP cleaning agent composition.

Claims

1. A CIP cleaning agent composition comprising as an A component one or a plurality of compounds selected from a group including a fatty acid represented by Formula (1), an ethercarboxylic acid represented by Formula (2), a diglyceride or trigyceride represented by Formula (3) and a fatty acid ester represented by Formula (4) shown below in an amount of 0.005-30.0 wt.%, calculated as a pure component.







(where R is a C₅-C₂₁ alkyl group or alkenyl group or a C_7-C₁₉ alkylallyl group or alkenylallyl group; E is an ethylene group, n is integer of 0 to 10; m is 1 or 2; Each of R₁, R₂, and R₃ is a hydrogen atom or a C₆-C₂₂ saturated or unsaturated acyl group, wherein at least two of R₁, R₂, and R₃ are C₆-C₂₂ saturated or unsaturated acyl groups. R₄ is a C₉-C₂₁ alkyl group or alkenyl group. R₅ is a C₁-C₂₂ alkyl group or alkenyl group).

2. A CIP cleaning agent composition comprising as an A component one or a plurality of compounds selected from a group including a fatty acid represented by Formula (1), an ethercarboxylic acid represented by Formula (2), a diglyceride or trigyceride represented by Formula (3) and a fatty acid ester represented by Formula (4) shown below in an amount of 0.005-30.0 wt.% and as a B component an inorganic acid and/or organic acid in an amount of 0.01 wt.% or more (both calculated as a pure component).







(where R is a C₅-C₂₁ alkyl group or alkenyl group or a C_7-C₁₉ alkylallyl group or alkenylallyl group; E is an ethylene group, n is integer of 0 to 10; m is 1 or 2; Each of R₁, R₂, and R₃ is a hydrogen atom or a C₆-C₂₂ saturated or unsaturated acyl group, wherein at least two of R₁, R₂, and R₃ are C₆-C₂₂ saturated or unsaturated acyl groups. R₄ is a C₉-C₂₁ alkyl group or alkenyl group. R₅ is a C₁-C₂₂ alkyl group or alkenyl group) .

3. The CIP cleaning agent according to claim 1 or 2, further comprising as a C component a solubilizing agent in an amount of 0.005-30.0 wt.%, calculated as a pure component.

4. The CIP cleaning agent according to claim 3, wherein the solubilizing agent as the C component contains one or a plurality of agents selected from the group including acid types of anionic surfactants, benzoic acid, paratoluenesulfonic acid, metaxylene sulfonic acid, cumenesulfonic acid, and alkali metal salts thereof, and solvents.

5. The CIP cleaning agent according to any of claims 1 to 4, wherein the fatty acid of said Formula (1) as the A component contains one or a plurality of acids selected from the group including caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, palmitoleic acid, oleic acid, linoleic acid, linolenic acid, and undecylenic acid.

6. The CIP cleaning agent according to any of claims 1 to 4, wherein the ethercarboxylic acid of said Formula (2) as the A component contains one or a plurality of acids selected from the group including polyoxyethylene octyl ether acetic acid, polyoxyethylene decyl ether acetic acid, polyoxyethylene lauryl ether acetic acid, polyoxyethylene myristyl ether acetic acid, and polyoxyethylene oleyl ether acetic acid.

7. The CIP cleaning agent according to any of claims 1 to 4, wherein the diglyceride of said Formula (3) as the A component is selected from food cooking oils and the triglyceride of said Formula (3) contains one or a plurality of oils selected from the group including corn oil, safflower oil, sunflower oil, olive oil, cotton oil, rice oil, rapeseed oil, palm oil, arachis oil, coconut oil, and soybean oil.

8. The CIP cleaning agent according to any of claims 1 to 4, wherein the fatty acid ester of said Formula (4) as the A component contains one or a plurality of esters selected from the group including oleic acid ethyl ester, oleic acid oleyl ester, myristic acid isopropyl ester, and palmitic acid isopropyl ester.

9. A cleaning method comprising using the CIP cleaning agent composition described in any claim of claims 1 to 8, preparing a diluted cleaning fluid with an acidic pH, and conducting the two processes of acid cleaning and deodorizing in one step.

10. The cleaning method according to claim 9, wherein the content of the A component in said diluted cleaning fluid is 100 mg per 1000 mL or higher.