CN110243993A - A kind of detection method of cream acidity - Google Patents
A kind of detection method of cream acidity Download PDFInfo
- Publication number
- CN110243993A CN110243993A CN201810187841.6A CN201810187841A CN110243993A CN 110243993 A CN110243993 A CN 110243993A CN 201810187841 A CN201810187841 A CN 201810187841A CN 110243993 A CN110243993 A CN 110243993A
- Authority
- CN
- China
- Prior art keywords
- cream
- sodium hydroxide
- water
- solution
- acidity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
- G01N21/80—Indicating pH value
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/16—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using titration
Abstract
The invention discloses a kind of detection methods of cream acidity.Water will not be additionally added in cream sample mixture to be titrated in existing cream acidity detection method, because the common sense based on this field, cream are not readily dissolved in water, water is added to be unfavorable for creamer dissolved, influence its accuracy for measuring acidity.However, suitable quantity of water is added in inventor during preparing cream sample mixture for the first time, creamer dissolved degree not only will not influence, and improve the stability of phenolphthalein discoloration, extend the residence time of terminal colour, the residence time is made to be 30s or more.At the same time, the addition of water also has no special requirements to the degree that shakes up in titration process, finally makes terminal colour readily discernible, reduces the measurement difficulty of cream acidity, improve its accuracy.
Description
Technical field
The invention belongs to physico-chemical examination technique fields, and in particular to a kind of detection method of cream acidity.
Background technique
Cream is the fats portion of cow's milk, is a kind of O/W type cream obtained from separating in cow's milk by skimmed milk
Shape liquid, is widely used, and can be used to make a cake, mousse and ice cream, can also be added in inside bread or be layered on coffee and eat
With human body replenishing vitamins A can be given.
During preparing cream, cream acidity is an important Testing index, acidity it is too small or it is excessive can shadow
Ring its mouthfeel and character.Currently, the method for detection cream acidity is National Standard Method GB5009.239-2016, it is using indicator
With cobaltous sulfate reference colour titration, because cream is not readily dissolved in water, therefore cream is dissolved using neutral alcohol-ether mixed liquor；It connects
Instructions phenolphthalein solution is added thereto, titrated after mixing with standard solution of sodium hydroxide, while be added dropwise while rotate flask, until color
It is similar to the color of reference solution, and do not subside in 5s, record the Standard Volumetric Solutions for Sodium Hydroxide ml of consumption, Ji Keji
Calculation obtains cream acidity.
But during actual measurement, degree is more demanding to shaking up for said determination method, if that shakes violent, terminal colour
Can pop-off, continuing titration, to will lead to measurement result higher；If that shakes is insufficient, terminal colour occurs in advance, will lead to survey
Determine Lower result.At the same time, the said determination method defect short there is also the terminal colour residence time, these will lead to end
The point more difficult identification of color, increases the measurement difficulty of cream acidity, reduces its accuracy.
Summary of the invention
For this purpose, to be solved by this invention is that there are the more difficult identifications of terminal colour, survey for the measuring method of existing cream acidity
Determine the defect that difficulty is big, accuracy is low, and then the cream that a kind of terminal colour is recognizable, measurement is simple, accuracy is high is provided
The detection method of acidity.
In order to solve the above technical problems, The technical solution adopted by the invention is as follows:
The detection method of cream acidity provided by the present invention includes the following steps: to detect butter acid using indicator method
When spending, before titrating cream sample, water is added in Xiang Suoshu cream sample.
Further, the indicator method is phenolphthalein indicator method.
It further, further include that neutrality is added into the cream sample before water is added into the cream sample
Alcohol-ether mixed liquor and the step of shake up；And/or
It further include that instructions phenolphthalein solution is added thereto and shakes while water is added into the cream sample or later
It is even, it is configured to cream sample mixture.
Further, before titrating the cream sample, further include the steps that blank test is arranged, the blank test is
It is titrated to itself and standard reference solution solid colour with standard solution of sodium hydroxide, writes down disappearing for standard solution of sodium hydroxide at this time
Consume volume V0；And/or
The step of titration cream sample are as follows: with standard solution of sodium hydroxide titrate the cream sample mixture to its
Color and standard reference solution solid colour, write down the consumption volume V of standard solution of sodium hydroxide at this time.
Further, further include the steps that (1) calculates according to the following formula and learn cream acidity:
X={ C × (V-V0)×100}/(m×0.1) (1)
X-cream sample acidity, unit are degree (° T) [with 0.1mol/L sodium hydroxide consumed by 100g cream sample
Ml meter, unit be every 100 grams of milliliter]；
C-standard solution of sodium hydroxide molar concentration, unit are mole every liter；
The volume of consumed standard solution of sodium hydroxide when V-titration, unit are milliliter；
V0The volume of the consumed standard solution of sodium hydroxide of-blank assay, unit are milliliter；
100-100g cream samples；
M-cream sample quality, unit are gram；
The molar concentration of 0.1-acidity theoretical definition sodium hydroxide, unit are mole every liter.
Further, the volume ratio of the neutral alcohol-ether mixed liquor and water is (25-35): (20-80).
Further, the volume ratio of the neutral alcohol-ether mixed liquor and water is (25-35): (40-60).
Further, the ratio of the cream sample, neutral alcohol-ether mixed liquor and instructions phenolphthalein solution is 10g:(25-
35) mL:(1-2) mL:(1.5-2.5) mL.
Further, the molar concentration of the standard solution of sodium hydroxide is 0.0975-0.1025moL/L.
Further, the standard reference solution is to mix the reference solution, neutral alcohol-ether mixed liquor and water
It obtains；
The reference solution is 3g cobalt sulfate to be dissolved in the water, and be settled to 100mL with water and obtain.
The volume of the water added in the standard reference solution and the cream sample added in the cream sample mixture
It is equal.
Further, the cream sample mixture is being titrated to its color and the standard with standard solution of sodium hydroxide
During reference solution solid colour, terminal colour retention time is not less than 30s.
Further, during preparing the cream sample mixture, Xian Jiashui adds the instructions phenolphthalein solution again.
Compared with prior art, the invention has the following beneficial effects:
(1) detection method of cream acidity provided by the present invention, existing cream acidity detection method will not be to be titrated
Cream sample mixture in water is additionally added because the common sense based on this field, cream are not readily dissolved in water, water is added to be unfavorable for milk
Oil dissolution influences its accuracy for measuring acidity.However, inventor is added during preparing cream sample mixture for the first time
Suitable quantity of water not only will not influence creamer dissolved degree, and improve the stability of phenolphthalein discoloration, extend the stop of terminal colour
Time makes the residence time be 30s or more.At the same time, the addition of water also shakes up degree without special in titration process
It is required that finally making terminal colour readily discernible, the measurement difficulty of cream acidity is reduced, its accuracy is improved.
(2) detection method of cream acidity provided by the present invention, inventor are preparing cream sample mixture for the first time
It is added suitable quantity of water in the process, and itself and neutral alcohol-ether mixed liquor is cooperated, using the mating reaction of water phase and organic phase,
It not only will not influence creamer dissolved degree, and improve the stability of phenolphthalein discoloration, extend the residence time of terminal colour, make
Residence time is 30s or more.At the same time, the addition of water also has no special requirements to the degree that shakes up in titration process, most
Make terminal colour readily discernible eventually, reduces the measurement difficulty of cream acidity, improve its accuracy.
(3) detection method of cream acidity provided by the present invention, repeated detection cream acidity, standard deviation is small, shows
Its testing result stability and consistency are high；Further, neutral alcohol-ether mixed liquor and water volume ratio is optimized, more
The measurement accuracy for helping to improve cream acidity, reduces measurement difficulty；By optimizing cream sample, neutral alcohol-ether
The ratio of mixed liquor, instructions phenolphthalein solution ensure that cream sample is sufficiently dissolved into one, meanwhile, extend the stop of terminal colour
Time.
Specific embodiment
Technical solution of the present invention is clearly and completely described below, it is clear that described embodiment is the present invention
A part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
Substance used is as follows in following each embodiment and comparative examples: the reference solution: 3g cobalt sulfate is dissolved in water
In, and be settled to 100mL with water and obtain；
The instructions phenolphthalein solution: 0.5g phenolphthalein is dissolved in the ethyl alcohol that 75mL volume fraction is 95%, is added 20mL water, is then dripped
Adding sodium hydroxide solution is added after water is settled to 100mL and is obtained to micro mist color；
The neutral alcohol-ether mixed liquor: adding 2-3 drop instructions phenolphthalein solution after taking isometric ethyl alcohol, ether mixing, with
Standard solution of sodium hydroxide drops to blush；
Standard reference solution: water is added into 250mL conical flask and (water is added in the additional amount and cream sample mixture of water
Amount it is equal), 30mL neutral alcohol-ether mixed liquor and 2.0mL reference solution, gently rotate, be uniformly mixed, standard ginseng is made
Compare solution；
Embodiment 1
The detection method for present embodiments providing a kind of cream acidity, includes the following steps:
1) 50ml water, 30mL neutral alcohol-ether mixed liquor and 2.0mL phenol blank test: are added into 250mL conical flask
Phthalein indicator solution mixes, and gently rotates, and is uniformly mixed, and blank sample is made；
It is that 0.1014moL/L standard solution of sodium hydroxide is titrated to blank sample to its color and standard ginseng with molar concentration
Than solution colour (micro mist color), the consumption volume V of standard solution of sodium hydroxide at this time is write down0；
2) it prepares cream sample mixture: weighing 10g cream sample, and place it in 250mL conical flask, 30mL is added
Neutral alcohol-ether mixed liquor, shakes up；It is subsequently added into 50mL water；2.0mL instructions phenolphthalein solution is added, is shaken up, cream examination is made
Sample mixture；
It is finally the titration of 0.1014moL/L standard solution of sodium hydroxide with molar concentration, shakes conical flask in titration process,
Until its color and standard reference solution solid colour, write down the consumption volume V of standard solution of sodium hydroxide at this time, and according to such as
Lower formula (1) calculates and learns cream acidity:
X={ C × (V-V0)×100}/(m×0.1) (1)
X-cream sample acidity, unit are degree (° T) [with 0.1mol/L sodium hydroxide consumed by 100g cream sample
Ml meter, unit be every 100 grams of milliliter]；
C-standard solution of sodium hydroxide molar concentration, unit are mole every liter；
The volume of consumed standard solution of sodium hydroxide when V-titration, unit are milliliter；
V0The volume of the consumed standard solution of sodium hydroxide of-blank assay, unit are milliliter；
100-100g cream samples；
M-cream sample quality, unit are gram；
The molar concentration of 0.1-acidity theoretical definition sodium hydroxide, unit are mole every liter.
Embodiment 2
The detection method for present embodiments providing a kind of cream acidity, includes the following steps:
1) 20mL water, 35mL neutral alcohol-ether mixed liquor and 1.0mL phenol blank test: are added into 250mL conical flask
Phthalein indicator solution mixes, and gently rotates, and is uniformly mixed, and blank sample is made；
It is that 0.1014moL/L standard solution of sodium hydroxide is titrated to blank sample to its color and standard ginseng with molar concentration
Than solution colour (micro mist color), the consumption volume V of standard solution of sodium hydroxide at this time is write down0；
2) it prepares cream sample mixture: weighing 10g cream sample, and place it in 250mL conical flask, 35mL is added
Neutral alcohol-ether mixed liquor, shakes up；It is subsequently added into 20mL water；1.0mL instructions phenolphthalein solution is added, is shaken up, cream examination is made
Sample mixture；
It is finally the titration of 0.1014moL/L standard solution of sodium hydroxide with molar concentration, shakes conical flask in titration process,
Until its color and standard reference solution solid colour, write down the consumption volume V of standard solution of sodium hydroxide at this time, and according to upper
It states formula (1) calculating and learns cream acidity.
Embodiment 3
The detection method for present embodiments providing a kind of cream acidity, includes the following steps:
1) 80mL water, 25mL neutral alcohol-ether mixed liquor and 1.5mL phenol blank test: are added into 250mL conical flask
Phthalein indicator solution mixes, and gently rotates, and is uniformly mixed, and blank sample is made；
It is that 0.1014moL/L standard solution of sodium hydroxide is titrated to blank sample to its color and standard ginseng with molar concentration
Than solution colour (micro mist color), the consumption volume V of standard solution of sodium hydroxide at this time is write down0；
2) it prepares cream sample mixture: weighing 10g cream sample, and place it in 250mL conical flask, 25mL is added
Neutral alcohol-ether mixed liquor, shakes up；It is subsequently added into 80mL water；1.5mL instructions phenolphthalein solution is added, is shaken up, cream examination is made
Sample mixture；
It is finally the titration of 0.1014moL/L standard solution of sodium hydroxide with molar concentration, shakes conical flask in titration process,
Until its color and standard reference solution solid colour, write down the consumption volume V of standard solution of sodium hydroxide at this time, and according to upper
It states formula (1) calculating and learns cream acidity.
Embodiment 4
The detection method for present embodiments providing a kind of cream acidity, includes the following steps:
1) water, 25mL neutral alcohol-ether mixed liquor and the 2mL phenol of 60mL blank test: are added into 250mL conical flask
Phthalein indicator solution mixes, and gently rotates, and is uniformly mixed, and blank sample is made；
It is that 0.1014moL/L standard solution of sodium hydroxide is titrated to blank sample to its color and standard ginseng with molar concentration
Than solution colour (micro mist color), the consumption volume V of standard solution of sodium hydroxide at this time is write down0；
2) it prepares cream sample mixture: weighing 10g cream sample, and place it in 250mL conical flask, 25mL is added
Neutral alcohol-ether mixed liquor, shakes up；It is subsequently added into 60mL water；2mL instructions phenolphthalein solution is added, is shaken up, cream sample is made
Mixture；
It is finally the titration of 0.1014moL/L standard solution of sodium hydroxide with molar concentration, shakes conical flask in titration process,
Until its color and standard reference solution solid colour, write down the consumption volume V of standard solution of sodium hydroxide at this time, and according to upper
It states formula (1) calculating and learns cream acidity.
Embodiment 5
The detection method for present embodiments providing a kind of cream acidity, includes the following steps:
1) 40mL water, 35mL neutral alcohol-ether mixed liquor and 2mL phenolphthalein blank test: are added into 250mL conical flask
Indicator solution mixes, and gently rotates, and is uniformly mixed, and blank sample is made；
It is that 0.1014moL/L standard solution of sodium hydroxide is titrated to blank sample to its color and standard ginseng with molar concentration
Than solution colour (micro mist color), the consumption volume V of standard solution of sodium hydroxide at this time is write down0；
2) it prepares cream sample mixture: weighing 10g cream sample, and place it in 250mL conical flask, 35mL is added
Neutral alcohol-ether mixed liquor, shakes up；It is subsequently added into 40mL water；2mL instructions phenolphthalein solution is added, is shaken up, cream sample is made
Mixture；
It is finally the titration of 0.1014moL/L standard solution of sodium hydroxide with molar concentration, shakes conical flask in titration process,
Until its color and standard reference solution solid colour, write down the consumption volume V of standard solution of sodium hydroxide at this time, and according to upper
It states formula (1) calculating and learns cream acidity.
Comparative example 1
This comparative example provides a kind of detection method of cream acidity, includes the following steps:
1) 30mL neutral alcohol-ether mixed liquor and the instruction of 2.0mL phenolphthalein blank test: are added into 250mL conical flask
Liquid mixes, and gently rotates, and is uniformly mixed, and blank test is made；
It is that 0.1014moL/L standard solution of sodium hydroxide is titrated to blank sample to its color and standard ginseng with molar concentration
Than solution colour (micro mist color), the consumption volume V of standard solution of sodium hydroxide at this time is write down0；
2) it prepares cream sample mixture: weighing 10g cream sample, and place it in 250mL conical flask, 30mL is added
Neutral alcohol-ether mixed liquor, shakes up；2.0mL instructions phenolphthalein solution is added, is shaken up, cream sample mixture is made；
It is finally the titration of 0.1014moL/L standard solution of sodium hydroxide with molar concentration, shakes conical flask in titration process,
Until its color and standard reference solution solid colour, write down the consumption volume V of standard solution of sodium hydroxide at this time, and according to upper
It states formula (1) calculating and learns cream acidity.
Comparative example 2
This comparative example provides a kind of detection method of cream acidity, includes the following steps:
1) 5mL water, 35mL neutral alcohol-ether mixed liquor and 2mL phenolphthalein blank test: are added into 250mL conical flask
Indicator solution mixes, and gently rotates, and is uniformly mixed, and blank sample is made；
It is that 0.1014moL/L standard solution of sodium hydroxide is titrated to blank sample to its color and standard ginseng with molar concentration
Than solution colour (micro mist color), the consumption volume V of standard solution of sodium hydroxide at this time is write down0；
2) it prepares cream sample mixture: weighing 10g cream sample, and place it in 250mL conical flask, 35mL is added
Neutral alcohol-ether mixed liquor, shakes up；It is subsequently added into 5mL water；2mL instructions phenolphthalein solution is added, is shaken up, cream sample is made
Mixture；
It is finally the titration of 0.1014moL/L standard solution of sodium hydroxide with molar concentration, shakes conical flask in titration process,
Until its color and standard reference solution solid colour, write down the consumption volume V of standard solution of sodium hydroxide at this time, and according to upper
It states formula (1) calculating and learns cream acidity:
Comparative example 3
This comparative example provides a kind of detection method of cream acidity, includes the following steps:
1) 130mL water, 35mL neutral alcohol-ether mixed liquor and 2mL phenol blank test: are added into 250mL conical flask
Phthalein indicator solution mixes, and gently rotates, and is uniformly mixed, and blank sample is made；
It is that 0.1014moL/L standard solution of sodium hydroxide is titrated to blank sample to its color and standard ginseng with molar concentration
Than solution colour (micro mist color), the consumption volume V of standard solution of sodium hydroxide at this time is write down0；
2) it prepares cream sample mixture: weighing 10g cream sample, and place it in 250mL conical flask, 35mL is added
Neutral alcohol-ether mixed liquor, shakes up；It is subsequently added into 130mL water；2mL instructions phenolphthalein solution is added, is shaken up, cream examination is made
Sample mixture；
It is finally the titration of 0.1014moL/L standard solution of sodium hydroxide with molar concentration, shakes conical flask in titration process,
Until its color and standard reference solution solid colour, write down the consumption volume V of standard solution of sodium hydroxide at this time, and according to upper
It states formula (1) calculating and learns cream acidity:
Test example 1
It is detected 10g same cream sample 10 times using the detection method in the various embodiments described above and comparative example is continuous respectively,
Consumption volume V and the residence time of terminal colour of standard solution of sodium hydroxide are write down, each surveyed butter acid angle value is calculated, and
Calculate the residence time of terminal colour in the standard deviation and 10 detections of 10 butter acid angle value of each detection method gained
Number not less than 30s, corresponding test result is as follows shown in table 1:
Table 1, test result
From table 1 it can be seen that: the detection method of cream acidity of the invention during preparing cream sample mixture plus
Enter suitable quantity of water, and itself and neutral alcohol-ether mixed liquor cooperated, using the mating reaction of water phase and organic phase, not but not
Creamer dissolved degree is influenced, and improves the stability of phenolphthalein discoloration, the residence time of terminal colour is extended, makes the residence time
It is 30s or more, and ground is required to the degree that shakes up, it is simple to shake.Meanwhile the standard deviation of testing result
It is small, it is not more than 0.14%, far smaller than in 10% deviation range below required by detection method precision, shows its detection
As a result stability and consistency are high.
Phenomenon in the titration process of observation embodiment 1-5 simultaneously, terminal colour easily distinguishes, retention time is long；And
Phenomenon in comparative example 1 is that its terminal colour difficulty distinguishes that the dynamics for shaking conical flask is too big, is easy to cause result bigger than normal, dynamics
It is smaller, it is easy to cause result less than normal, and in the case that shaking flask dynamics is got hold of in titration process, terminal colour takes off quickly.
Test example 2
Use detection method in the various embodiments described above and comparative example respectively continuously detection 10g butter acid angle value for
The consumption volume V of standard solution of sodium hydroxide is write down in same cream sample 10 times of 12.035 ° of T, calculates each surveyed butter acid
Angle value, and calculate 10 butter acid angle value obtained by each detection method absolute difference with 12.035, i.e. D=∣ X respectivelyIt surveys-
12.035 ∣ record the distribution of 10 absolute differences of 10 measurement results, and corresponding test result is as follows shown in table 2:
2,10 absolute difference D distributions of table
| D≤0.05 ° T/ times | 0.15 ° of 0.05 ° of T < D < T/ times | 0.15 ° of T≤D/ times | |
| Embodiment 1 | 10 | 0 | 0 |
| Embodiment 2 | 9 | 1 | 0 |
| Embodiment 3 | 8 | 2 | 0 |
| Embodiment 4 | 10 | 0 | 0 |
| Embodiment 5 | 10 | 0 | 0 |
| Comparative example 1 | 1 | 4 | 5 |
| Comparative example 2 | 3 | 3 | 6 |
| Comparative example 3 | 4 | 5 | 1 |
Remarks: the butter acid angle value (12.035 ° of T) of cream sample can be veteran testing staff, can skillfully slap
The degree that shakes up of conical flask, and rapid examination terminal colour are held, which, through 10 times or more tests, is taken using National Standard Method
Its average value obtains, and butter acid angle value is believed that the true butter acid angle value for reflecting the cream sample.
From table 2 it can be seen that: the detection method of cream acidity of the invention can significantly improve cream acidity relative to National Standard Method
Accuracy, while its testing result stability and consistency are high.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (10)
1. a kind of detection method of cream acidity, when including the following steps: using indicator method detection cream acidity, in titration milk
Before oily sample, water is added in Xiang Suoshu cream sample.
2. detection method according to claim 1, which is characterized in that the indicator method is phenolphthalein indicator method.
3. detection method according to claim 2, which is characterized in that before water is added into the cream sample, also
Include the steps that neutral alcohol-ether mixed liquor is added into the cream sample and shakes up；And/or
While water is added into the cream sample or later, further includes that instructions phenolphthalein solution is added thereto and shakes up, match
Cream sample mixture is made.
4. detection method according to claim 3, which is characterized in that further include setting before titrating the cream sample
The step of blank test, the blank test are to be titrated to its color and standard reference solution color with standard solution of sodium hydroxide
Unanimously, the consumption volume V of standard solution of sodium hydroxide at this time is write down0；And/or
The step of titration cream sample are as follows: titrate the cream sample mixture to its color with standard solution of sodium hydroxide
With standard reference solution solid colour, the consumption volume V of standard solution of sodium hydroxide at this time is write down.
5. detection method according to claim 4, which is characterized in that further include that milk is learnt in (1) calculating according to the following formula
The step of oleic acid is spent:
X={ C × (V-V0)×100}/(m×0.1) (1)
X-cream sample acidity, unit are degree (° T) [with 0.1mol/L sodium hydroxide milliliter consumed by 100g cream sample
Number meter, unit are every 100 grams of milliliter]；
C-standard solution of sodium hydroxide molar concentration, unit are mole every liter；
The volume of consumed standard solution of sodium hydroxide when V-titration, unit are milliliter；
V0The volume of the consumed standard solution of sodium hydroxide of-blank assay, unit are milliliter；
100-100g cream samples；
M-cream sample quality, unit are gram；
The molar concentration of 0.1-acidity theoretical definition sodium hydroxide, unit are mole every liter.
6. the detection method according to any one of claim 3-5, which is characterized in that the neutral alcohol-ether mixing
The volume ratio of liquid and water is (25-35): (20-80).
7. detection method according to claim 6, which is characterized in that the neutral alcohol-ether mixed liquor and water body
Product is than being (25-35): (40-60).
8. the detection method according to any one of claim 3-7, which is characterized in that the cream sample, neutral alcohol-
The ratio of ether mixed liquor and instructions phenolphthalein solution is 10g:(25-35) mL:(1-2) mL.
9. the detection method according to any one of claim 4-8, which is characterized in that the standard solution of sodium hydroxide
Molar concentration is 0.0975-0.1025moL/L.
10. the detection method according to any one of claim 4-9, which is characterized in that the standard reference solution is will
The reference solution, neutral alcohol-ether mixed liquor and water are mixed to get；
The reference solution is 3g cobalt sulfate to be dissolved in the water, and be settled to 100mL with water and obtain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810187841.6A CN110243993A (en) | 2018-03-07 | 2018-03-07 | A kind of detection method of cream acidity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810187841.6A CN110243993A (en) | 2018-03-07 | 2018-03-07 | A kind of detection method of cream acidity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110243993A true CN110243993A (en) | 2019-09-17 |
Family
ID=67882489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810187841.6A Pending CN110243993A (en) | 2018-03-07 | 2018-03-07 | A kind of detection method of cream acidity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110243993A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458739A (en) * | 2014-12-31 | 2015-03-25 | 山东三星玉米产业科技有限公司 | Method for detecting acid value of vegetable oil containing oryzanol |
-
2018
- 2018-03-07 CN CN201810187841.6A patent/CN110243993A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458739A (en) * | 2014-12-31 | 2015-03-25 | 山东三星玉米产业科技有限公司 | Method for detecting acid value of vegetable oil containing oryzanol |
Non-Patent Citations (1)
| Title |
|---|
| 中华人民共和国卫生部: "《GB5413.34-2010 食品安全国家标准乳和乳制品酸度的测定》", 26 March 2010 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ko et al. | A submicromolar assay for nonpolar acids in plasma and depot fat | |
| CN104483311A (en) | Indicator for simultaneous measurement of calcium, barium and magnesium in silicon-calcium-barium-magnesium by adopting EDTA titration method | |
| CN104215772A (en) | Heart-type fatty acid binding protein detection kit and making method thereof | |
| CN105987900B (en) | The measuring method of sulfate ion in a kind of electrolyte for lithium ion battery | |
| CN102692470B (en) | Measure the method for the content of solubility arsenic and valency state arsenic in the medicine containing realgar | |
| CN103901018B (en) | Fireworks and firecrackers magnesium in pyrotechnic composition main constituent and aluminum content tests method | |
| CN106841457B (en) | The measuring method of methaqualone and diazepam residual quantity in a kind of animal derived food | |
| CN110243993A (en) | A kind of detection method of cream acidity | |
| North | Colorimetric determination of capsaicin in oleoresin of capsicum | |
| CN108169342A (en) | The detection method of neotame content in milk-contained drink | |
| CN106290680B (en) | The analysis method of the intermediate S- cyanogen methyl isothiourea of cefmetazole acid | |
| CN109254111A (en) | A kind of detection method and preparation method thereof of Water soluble fertilizer nitrate nitrogen content | |
| CN108982751A (en) | A method of measurement Rice oil fatty acid value | |
| CN110455731A (en) | Composite phosphate detection method in a kind of meat products | |
| CN101995381A (en) | Method for measuring cobalt in cobalt-containing material by using 5-Cl-PADAB photometry | |
| CN114324647B (en) | Simultaneous determination of vitamin K in milk powder 1 And K 2 Methods and uses of (2) | |
| CN107144655B (en) | A kind of method of 5 kinds of naphthalene derivatives in detection fruit | |
| CN107228856A (en) | A kind of boiler feedwater quality hardness test agent and its preparation | |
| CN1715883A (en) | Detecting method for grain protein content | |
| Schmall et al. | Extraction and determination of salts of organic bases and acids | |
| CN111879891A (en) | Method for rapidly determining content of sulfite in industrial sulfuric acid | |
| CN108508136A (en) | A method of measuring vegetable fat powder acid value | |
| CN109239178A (en) | The pre-treating method of iodine and its application in ICP-MS method measurement premix minerals | |
| CN105136793A (en) | Preparation method of reagent for detecting hydroxyl phenylalanine metabolite from urine | |
| CN108760902A (en) | It is a kind of for sodium potassium ion in andrographolide bulk pharmaceutical than detection method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190917 |
|
| RJ01 | Rejection of invention patent application after publication |