CN106323800A - Determination method for moisture content of condensed milk - Google Patents
Determination method for moisture content of condensed milk Download PDFInfo
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- CN106323800A CN106323800A CN201510331400.5A CN201510331400A CN106323800A CN 106323800 A CN106323800 A CN 106323800A CN 201510331400 A CN201510331400 A CN 201510331400A CN 106323800 A CN106323800 A CN 106323800A
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- sea sand
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Abstract
The invention puts forward a determination method for the moisture content of condensed milk. The method comprises: mixing to-be-determined condensed milk, sea sand and pure water, wherein on the basis of 1.5g of the condensed milk, the dosage of the pure water is 5ml, and the mass of the sea sand is at least 2 times the total mass of the condensed milk and pure water; heating the obtained mixture to a constant weight; and based on the mass difference of the mixture before and after heating, determining the moisture content of condensed milk. The inventor finds that the method provided by the invention can effectively improve the precision and accuracy of moisture content detection.
Description
Technical field
The present invention relates to field of food, concrete, the present invention relates to a kind of method measuring condensed milk moisture.
Background technology
At field of food, moisture is the important indicator affecting product.And according to the requirement of standard GB/T 13102, breast is solid
Body and non-fat solid, protein all can be affected by this index of moisture.Because GB 13102 requires milk solids=100%
-moisture (%)-sucrose (%)；Non-fat solid (%)=100%-fat (%)-moisture (%)-sucrose (%)；Protein is >=non-
The 34 of fat milk solids.
GB 5009.3-2010 " mensuration of moisture in national food safety standard food " provides the mensuration to common food
Method.
But, the assay method of current condensed milk moisture still haves much room for improvement.
Summary of the invention
At least one shortcoming that present invention seek to address that prior art or being replaced with of a kind of prior art is provided.
The present invention is following discovery based on inventor and completes:
Inventor find use GB 5009.3-2010 " mensuration of moisture in national food safety standard food " direct
Seasoning carries out the moisture of condensed milk when being measured, and after drying, quality straight line declines every time, it is impossible to constant weight, causing cannot
Gather experimental data accurately.Inventor finds through lot of experiments, due in condensed milk containing more large content of sugar and
Additive, therefore, conventional direct drying method, it is difficult to be applicable to the moisture detection of condensed milk.To this end, inventor passes through
Substantial amounts of experiment finds, is mixed according to special ratios with pure water by condensed milk by using, and selects the use of suitable sea sand
Amount, can be effectively improved degree of accuracy and accuracy.
In view of this, in a first aspect of the present invention, the present invention proposes a kind of method measuring condensed milk moisture.According to
Embodiments of the invention, the method includes: condensed milk to be measured, sea sand and pure water are mixed, wherein, based on 1.5 grams of described refinings
Breast, the consumption of described pure water is 5 milliliters, and the quality of described sea sand be described condensed milk and described pure water quality summation extremely
Few 2 times；Carry out being heated to constant weight by the mixture obtained by step (1)；And before and after based on described heating, described mixed
The mass discrepancy of compound, determines the moisture of described condensed milk.Inventor finds, by pure water is mixed with condensed milk,
Degree of accuracy and the accuracy of detection moisture can be effectively improved.And inventor finds, if the consumption of pure water is less than
5 milliliters, then it is not enough to eliminate in condensed milk sugar and additive to determination of moisture adverse effect.If pure water
Consumption too high, then the accuracy of assay method can be caused to significantly reduce owing to introducing substantial amounts of water.It addition, according to this
Bright embodiment, sea sand is possible to prevent during heating to be formed surface sclerderm, and can effectively make sample dispersion,
Reduce the obstacle of sample moisture evaporation.But simultaneously according to embodiments of the invention, inventor finds, if the consumption mistake of sea sand
Low, sea sand can be caused to be not enough to realize the effect above, but, if the consumption of sea sand is excessive, then can cause assay method
Accuracy significantly reduces.
According to embodiments of the invention, the method for said determination condensed milk moisture can further include following supplementary technology
At least one feature:
According to embodiments of the invention, in aluminum dish, described condensed milk to be measured, described sea sand and described pure water are mixed and use glass
Glass rod is stirred, and wherein, described aluminum dish, described Glass rod and described sea sand are the most independently by advance 100～104
Constant weight process is carried out at a temperature of degree Celsius.Thus, it is possible to the contained moisture impact on assay method efficiency in abatement apparatus.
And then, improve the accuracy of assay method further.
According to embodiments of the invention, in step (2), described heating uses boiling water bath or adds hot plate and carry out.By
This, can be avoided in heating process, and the measurement result causing the exacerbated event such as liquid splash to cause is inaccurate.
According to embodiments of the invention, in step (2), after carrying out described heating, farther include described mixing
Thing carries out drying and processing.Thus, it is possible to improve the accuracy of assay method further.
According to embodiments of the invention, step (2) including: described mixture is placed in boiling water bath or adds in hot plate by (2-1),
Along with using described Glass rod to be stirred, described mixture is heated；(2-2) become dry or described sea when described sea sand
When sand presents graininess, described mixture is carried out drying and processing 4 hours at a temperature of 100～104 degrees Celsius.Thus,
The accuracy of assay method can be improved further.
According to embodiments of the invention, in step (3), following equation is used to determine the moisture of described condensed milk:
Wherein, X is the moisture of described condensed milk, and unit is g/100g；
M1 is before described heating, described aluminum dish, described sea sand, described Glass rod, described condensed milk and the matter of described pure water
Amount, unit is g；
M2 is after described heating, described aluminum dish, described sea sand, described Glass rod, described condensed milk and the matter of described pure water
Amount, unit is g；
M3 is that described aluminum dish, described sea sand and the quality of described Glass rod, unit is g after processing through described constant weight.
Thus, it is possible to improve the accuracy of assay method further.
Preferably, according to embodiments of the invention, the quality of described sea sand is described condensed milk and the 2～10 of described pure water quality summation
Times.Most preferably, according to embodiments of the invention, the quality of described sea sand is described condensed milk and described pure water quality summation
5 times.Thus, it is possible to realize optimal mensuration accuracy and sensitivity.Thus, it is possible to improve the standard of assay method further
Really property.
According to embodiments of the invention, the present invention proposes kind of the method measuring condensed milk moisture.Enforcement according to the present invention
Example, the method includes:
Equipment and reagent
Thermostatic drying chamber: 102 ± 2 DEG C.
Weighing botle, aluminum dish: diameter >=55mm.
Analytical balance: sensibility reciprocal is 0.1mg.
Exsiccator: included efficient drying agent.
Water-bath or add hot plate.
Hydrochloric acid solution (6mol/L): measure 50mL hydrochloric acid, be diluted with water to 100mL.
Sodium hydroxide solution (6mol/L): weigh 24g sodium hydroxide, is dissolved in water and is diluted to 100mL.
Sea sand: take washing and remove sea sand or the fluvial sand of earth, first boil 0.5h with hydrochloric acid (6mol/L), wash with water to neutrality,
Boil 0.5h with sodium hydroxide solution (6mol/L) again, wash with water to neutrality, through 105 DEG C of drying for standby.
Operational approach
Aluminum dish constant weight: take the aluminum dish of cleaning, inside add 25g sea sand and a little glass rod, be placed in 102 ± 2 DEG C of drying baker, claims
The bottle cap of measuring bottle tiltedly props up in weighing botle limit, heats at least 1.0h, and taking-up is built, and is cooled to room temperature in putting exsiccator, weighs,
And repeat to be dried to front and back twice of poor quality less than 2mg, it is constant weight.
Blank assay: add 60 ± 2 DEG C of pure water moistening sea sand of 5mL, stir evenly with Glass rod.4 it are dried in the baking oven of 102 ± 2 DEG C
Hour.Close the lid after drying, put into exsiccator and be cooled to room temperature weighing.
If the two difference (aluminum dish constant weight and the difference of blank assay) is more than 0.5mg, need again to detect sample
Moisture and blank assay, change sea sand or 9 pure water if desired.
Weigh 1.5g (being accurate to 0.1mg) sample and (inside add 25g sea sand and a little glass as the aluminum dish of 102 ± 2 DEG C of constant weights
Rod) in, close the lid, weigh.Add 5mL60 ± 2 DEG C pure water.After stirring with Glass rod, it is put into boiling water bath or heating
On dish, agitation at any time is in case hindering the evaporation of moisture after forming duricrust.When sea sand becomes dry or becomes graininess, aluminum dish is put into
102 ± 2 DEG C of drying in oven 4h.Open baking oven, close the lid and be immediately placed in exsiccator, be cooled to room temperature, weigh.So
After place in 102 ± 2 DEG C of drying baker and be dried after 1h, take out, put into after exsiccator is cooled to room temperature and weigh again.And repeat
More than operate and be constant weight to front and back twice is of poor quality less than 2mg.
Note: twice constant weight value, in last calculating, takes last weighing value.
Computing formula
The content of the moisture in sample calculates as follows:
In formula:
(1) X: the content of moisture in sample, unit is gram every hectogram (g/100g)；
(2)m1: aluminum dish (adding sea sand, glass rod) and the quality of sample, unit is gram (g)；
(3)m2: the quality after aluminum dish (adding sea sand, glass rod) and samples dried, unit is gram (g)；
(4)m3: the quality of aluminum dish (adding sea sand, glass rod), unit is gram (g).
According to embodiments of the invention, compared with prior art, the accuracy of condensed milk moisture detecting method has lifting significantly,
For ensureing that the quality of product plays an important role.Concrete, can have following advantages at least one:
Method has more actual operation, data more reliability compared with former national standard method according to an embodiment of the invention；
Method is compared with former national standard method according to an embodiment of the invention, and the method increases sea sand makes moisture and volatility thing
The disengagement area of matter more greatly, evener；
(3) compared with former national standard method, the method specify that Basic practice and the refinement step that can reach dry mass constant weight.
Method is compared with former national standard method according to an embodiment of the invention.
Detailed description of the invention
Below by specific embodiment, technical scheme is described, it should be noted that these embodiments are only
It is only for illustrative, and limits the scope of the present invention never in any form.It addition, unless stated otherwise, below
Embodiment employed in equipment and material be all commercially available, as do not clearly stated treatment conditions, then according to country
The requirement of standard such as GB 5009.3-2010 " mensuration of moisture in national food safety standard food " is carried out.
Embodiment 1
Equipment and reagent
Thermostatic drying chamber: 102 ± 2 DEG C,
Weighing botle or aluminum dish: diameter >=55mm,
Analytical balance: sensibility reciprocal is 0.1mg,
Exsiccator: included efficient drying agent,
Water-bath or add hot plate,
Hydrochloric acid solution (6mol/L): measure 50mL hydrochloric acid, be diluted with water to 100mL,
Sodium hydroxide solution (6mol/L): weigh 24g sodium hydroxide, is dissolved in water and is diluted to 100mL,
Sea sand: take washing and remove sea sand or the fluvial sand of earth, first boil 0.5h with hydrochloric acid (6mol/L), wash with water to neutrality,
Boil 0.5h with sodium hydroxide solution (6mol/L) again, wash with water to neutrality, through 105 DEG C of drying for standby.
Operational approach
Aluminum dish constant weight: take the aluminum dish of cleaning, inside add 25g sea sand and a little glass rod, be placed in 102 ± 2 DEG C of drying baker, bottle
Lid, tiltedly in bottle limit, heats at least 1.0h, and taking-up is built, and is cooled to room temperature in putting exsiccator, weighs, and repeat to be dried to
Front and back twice of poor quality less than 2mg, be constant weight.
Blank assay: add 60 ± 2 DEG C of pure water moistening sea sand of 5mL, stir evenly with Glass rod.4 it are dried in the baking oven of 102 ± 2 DEG C
Hour.Close the lid after drying, put into exsiccator and be cooled to room temperature weighing.
If the difference of above-mentioned aluminum dish constant weight and blank assay is more than 0.5mg, need again to detect the moisture of sample and
Blank assay, changes sea sand or pure water if desired.
Weigh 1.5g (being accurate to 0.1mg) sample and (inside add 25g sea sand and a little glass as the aluminum dish of 102 ± 2 DEG C of constant weights
Rod) in, close the lid, weigh.Add 5mL60 ± 2 DEG C pure water.After stirring with Glass rod, it is put into boiling water bath or heating
On dish, agitation at any time is in case hindering the evaporation of moisture after forming duricrust.When sea sand becomes dry or becomes graininess, aluminum dish is put into
102 ± 2 DEG C of drying in oven 4h.Open baking oven, close the lid and be immediately placed in exsiccator, be cooled to room temperature, weigh.Then
Place into after 102 ± 2 DEG C of drying baker are dried 1h, take out, put into after exsiccator is cooled to room temperature and weigh again.And repeat with
Upper operation is constant weight to front and back twice is of poor quality less than 2mg.Note: twice constant weight value, in last calculating, takes last
Secondary weighing value.
Computing formula
The content of the moisture in sample calculates as follows:
In formula:
(1) X: the content of moisture in sample, unit is gram every hectogram (g/100g)；
(2) m1: aluminum dish (adding sea sand, glass rod) and the quality of sample, unit is gram (g)；
(3) quality after m2: aluminum dish (adding sea sand, glass rod) and samples dried, unit is gram (g)；
(4) quality of m3: aluminum dish (adding sea sand, glass rod), unit is gram (g).
Result is quoted
Result retains three position effective digitals, as shown in table 1.
Precision
The absolute difference of the twice independent measurement result obtained under the conditions of repeatability must not exceed the 5% of arithmetic mean of instantaneous value.
Table 1
As can be seen from Table 1, according to the 1.5g condensed milk of this example, 5mL60 ± 2 DEG C pure water and 25g sea sand, seasoning is utilized
Carry out condensed milk determination of water precision high.
Embodiment 2
Testing according to method substantially the same manner as Example 1, difference is, weighs 5g sample (being accurate to 0.1mg),
Adding 3mL60 ± 2 DEG C pure water to mix in aluminum dish, measurement result is as shown in table 2, measurement result precision coincidence rate such as table 3
Shown in.
Table 2
Table 3
Embodiment 3
Testing according to method substantially the same manner as Example 1, difference is, weigh 5g sample (being accurate to 0.1mg),
5mL60 ± 2 DEG C pure water and 10 grams of sea sand mix in aluminum dish.Measurement result is as shown in table 4.
Table 4
Embodiment 4
Testing according to method substantially the same manner as Example 1, difference is, weigh 5g sample (being accurate to 0.1mg),
3mL60 ± 2 DEG C pure water and 25g sand mix in aluminum dish.Test result is as shown in table 5.
Table 5
The measurement result of embodiment 2～4 and the results contrast of embodiment 1, it can be seen that the consumption of pure water and the consumption pair of sea sand
For the precision of assay method it is critical that.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " concrete example ",
Or specific features, structure, material or the feature bag that the description of " some examples " etc. means to combine this embodiment or example describes
It is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not necessarily
Refer to identical embodiment or example.And, the specific features of description, structure, material or feature can be any
One or more embodiments or example combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: without departing from this
These embodiments can be carried out multiple change in the case of the principle of invention and objective, revise, replace and modification, the present invention
Scope limited by claim and equivalent thereof.
Claims (9)
1. the method measuring condensed milk moisture, it is characterised in that including:
Equipment and reagent
Thermostatic drying chamber: 102 ± 2 DEG C.
Weighing botle, aluminum dish: diameter >=55mm.
Analytical balance: sensibility reciprocal is 0.1mg.
Exsiccator: included efficient drying agent.
Water-bath or add hot plate.
Hydrochloric acid solution (6mol/L): measure 50mL hydrochloric acid, be diluted with water to 100mL.
Sodium hydroxide solution (6mol/L): weigh 24g sodium hydroxide, is dissolved in water and is diluted to 100mL.
Sea sand: take washing and remove sea sand or the fluvial sand of earth, first boil 0.5h with hydrochloric acid (6mol/L), wash with water to neutrality,
Boil 0.5h with sodium hydroxide solution (6mol/L) again, wash with water to neutrality, through 105 DEG C of drying for standby.
Operational approach
Aluminum dish constant weight: take the aluminum dish of cleaning, inside add 25g sea sand and a little glass rod, be placed in 102 ± 2 DEG C of drying baker, claims
The bottle cap of measuring bottle tiltedly props up in weighing botle limit, heats at least 1.0h, and taking-up is built, and is cooled to room temperature in putting exsiccator, weighs,
And repeat to be dried to front and back twice of poor quality less than 2mg, it is constant weight.
Blank assay: add 60 ± 2 DEG C of pure water moistening sea sand of 5mL, stir evenly with Glass rod.4 it are dried in the baking oven of 102 ± 2 DEG C
Hour.Close the lid after drying, put into exsiccator and be cooled to room temperature weighing.
If the two difference (aluminum dish constant weight and the difference of blank assay) is more than 0.5mg, need again to detect sample
Moisture and blank assay, change sea sand or 9 pure water if desired.
Weigh 1.5g (being accurate to 0.1mg) sample and (inside add 25g sea sand and a little glass as the aluminum dish of 102 ± 2 DEG C of constant weights
Rod) in, close the lid, weigh.Add 5mL60 ± 2 DEG C pure water.After stirring with Glass rod, it is put into boiling water bath or adds hot plate
On, agitation at any time is in case hindering the evaporation of moisture after forming duricrust.When sea sand becomes dry or becomes graininess into, aluminum dish is put 102 ± 2 DEG C
Drying in oven 4h.Open baking oven, close the lid and be immediately placed in exsiccator, be cooled to room temperature, weigh.Then 102 ± 2 DEG C are placed into
After drying baker is dried 1h, takes out, put into after exsiccator is cooled to room temperature and weigh again.And repeat above operation to front and back
Twice of poor quality is constant weight less than 2mg.
Note: twice constant weight value, in last calculating, takes last weighing value.
Computing formula
The content of the moisture in sample calculates as follows:
In formula:
(1) X: the content of moisture in sample, unit is gram every hectogram (g/100g)；
(2)m1: aluminum dish (adding sea sand, glass rod) and the quality of sample, unit is gram (g)；
(3)m2: the quality after aluminum dish (adding sea sand, glass rod) and samples dried, unit is gram (g)；
(4)m3: the quality of aluminum dish (adding sea sand, glass rod), unit is gram (g).
2. the method measuring condensed milk moisture, it is characterised in that including:
(1) condensed milk to be measured, sea sand and pure water being mixed, wherein, based on 1.5 grams of described condensed milk, the consumption of described pure water is
5 milliliters, and the quality of described sea sand is described condensed milk and at least 2 times of described pure water quality summation；
(2) carry out being heated to constant weight by mixture obtained in step (1)；And
(3) before and after based on described heating, the mass discrepancy of described mixture, determine the moisture of described condensed milk.
Method the most according to claim 2, it is characterised in that in aluminum dish, by described condensed milk to be measured, described sea sand
Mixing with described pure water and be stirred with Glass rod, wherein, described aluminum dish, described Glass rod and described sea sand are the most only
On the spot at a temperature of 100～104 degrees Celsius, carried out constant weight process in advance.
Method the most according to claim 3, it is characterised in that in step (2), described heating is to use boiling water
Bathe or add what hot plate was carried out.
Method the most according to claim 4, it is characterised in that in step (2), after carrying out described heating,
Farther include described mixture is carried out drying and processing.
Method the most according to claim 5, it is characterised in that step (2) including:
(2-1) described mixture it is placed in boiling water bath or adds in hot plate, being stirred, to institute along with using described Glass rod
State mixture to heat；
(2-2) when described sea sand becomes dry or described sea sand presents graininess, by described mixture at 100～104 degrees Celsius
At a temperature of carry out drying and processing 4 hours.
Method the most according to claim 6, it is characterised in that in step (3), uses following equation to determine institute
State the moisture of condensed milk:
Wherein, X is the moisture of described condensed milk, and unit is g/100g；
m1For before described heating, described aluminum dish, described sea sand, described Glass rod, described condensed milk and the matter of described pure water
Amount, unit is g；
m2For after described heating, described aluminum dish, described sea sand, described Glass rod, described condensed milk and the matter of described pure water
Amount, unit is g；
M3 is that described aluminum dish, described sea sand and the quality of described Glass rod, unit is g after processing through described constant weight.
Method the most according to claim 1, it is characterised in that the quality of described sea sand is described condensed milk and described pure water
2～10 times of quality summation.
Method the most according to claim 1, it is characterised in that the quality of described sea sand is described condensed milk and described pure water
5 times of quality summation.
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Cited By (5)
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| CN108375526A (en) * | 2018-01-05 | 2018-08-07 | 广州风行乳业股份有限公司 | A kind of method of quick detection condensed milk moisture |
| CN108572120A (en) * | 2018-04-09 | 2018-09-25 | 广西农业职业技术学院 | A kind of method of quick detection cake moisture |
| CN108982283A (en) * | 2018-06-08 | 2018-12-11 | 中食检测研究院有限公司 | A kind of method of water content detection in improved jelly |
| CN109060585A (en) * | 2018-09-11 | 2018-12-21 | 韩城市金太阳花椒油脂药料有限责任公司 | A kind of method of rapid survey moisture |
| CN111413246A (en) * | 2020-04-21 | 2020-07-14 | 深圳市深大检测有限公司 | Fruit moisture detection device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108375526A (en) * | 2018-01-05 | 2018-08-07 | 广州风行乳业股份有限公司 | A kind of method of quick detection condensed milk moisture |
| CN108572120A (en) * | 2018-04-09 | 2018-09-25 | 广西农业职业技术学院 | A kind of method of quick detection cake moisture |
| CN108982283A (en) * | 2018-06-08 | 2018-12-11 | 中食检测研究院有限公司 | A kind of method of water content detection in improved jelly |
| CN109060585A (en) * | 2018-09-11 | 2018-12-21 | 韩城市金太阳花椒油脂药料有限责任公司 | A kind of method of rapid survey moisture |
| CN111413246A (en) * | 2020-04-21 | 2020-07-14 | 深圳市深大检测有限公司 | Fruit moisture detection device |
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Application publication date: 20170111 |