CN103487560B - Method for rapidly judging stability of neutral high-fiber milk - Google Patents
Method for rapidly judging stability of neutral high-fiber milk Download PDFInfo
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Abstract
The invention discloses a method for rapidly judging stability of neutral high-fiber milk and belongs to the technical field of rapid dairy stability judgment. According to the method for rapidly judging the stability of the neutral high-fiber milk, the stability of the neutral high-fiber milk in shelf life is judged by measuring change conditions of viscosity, particles size and potential index before and after accelerated quality deterioration under constant temperature conditions of 4 DEG C, 25 DEG C, 37 DEG C and 50 DEG C. According to the method, the observation time of the stability of high-fiber milk products is greatly shortened, good or poor stability of the high-fiber milk products are basically judged within 10 days, the product development period is shortened, and the labor productivity is improved; the method has significance on developing products in dairy enterprises, and a gap of rapidly judging the stability of the neutral high-fiber milk is filled.
Description
Technical field
The present invention relates to the method for rapidly judging of the high fine the stability of milk of a kind of neutrality, particle diameter, potentiometric analyzer is particularly utilized to detect the change of numerical value between short-term specified temp resting period, judge product shelf phase stability with this, belong to dairy products rapidly judging stability technical field.
Background technology
Dietary fiber refers to can the human body small intestine summation of edible vegetable ingredients, carbohydrates and similar material digesting and assimilating, can partly or entirely ferment at human body large intestine.Comprise polysaccharide, compound sugar, lignin and relevant plant material, dietary fiber is called as the seventh-largest nutrient, has obtained the accreditation of the mankind, and in diet nutritional, play more and more important effect.
Domestic since 2011 high fine milk more and more go on the market as: Erie's taste can be grown, Mongolia Ox milk special, newly wish that the rich fibrous products such as banana milk go on the market in succession, the upsurge of the fine milk of a burst of height has been started in Chinese market, but in neutral milk, the higher meeting of fiber content causes fiber and milk protein in product to adsorb, assemble, shelf life 2-3 month time, there is protein coacervation sinkage, there will be severe product gel, layering.
Domestic packaged form mostly is Tetra Pak; 6 months shelf-lifves; and often can just there is obvious stability problem at about 2-3 month in this product; development just needs the very long observation period and could judge that its stability is good and bad; this just makes manufacturer's development excessive cycle, and efficiency of research and development is lower.
At present, judge that the method for high fine the stability of milk still belongs to blank at home fast.
Summary of the invention
Technical matters to be solved by this invention is the method for rapidly judging that the defect overcoming prior art provides the high fine the stability of milk of a kind of neutrality, the method by accelerate under the constant temperature that is determined at 4 DEG C, 25 DEG C, 37 DEG C and 50 DEG C viscosity before and after quality deterioration, particle diameter, current potential index situation of change judge in shelf life stability, greatly can save product stability observing time, shorten the R&D cycle, fill up the blank of the neutral high fine the stability of milk of quick judgement.
Technical matters of the present invention is realized by following technical scheme.
A method for rapidly judging for the high fine the stability of milk of neutrality, comprises the steps:
(1) sample preparation: according to the large material formula meeting neutral high fine milk requirement, material, homogeneous, UHT137 DEG C in simulated production, 4-6s process for sterilizing, sterile filling in the transparent aseptic PET bottle of 350ml as sample, place at 4 DEG C, 25 DEG C, 37 DEG C respectively, and to sample index at each temperature after sample making completes 24h: viscosity, particle diameter, current potential index detect, record data;
(2) sample stability tentatively sieves and determines: the constant temperature oven grouping of step (1) gained measuring samples being put into respectively 4 DEG C, 25 DEG C, 37 DEG C and 50 DEG C, leave standstill observation 5 days, observe whether product has gel, grows dim, phenomenon of phase separation, if arbitrary temperature occurs that above phenomenon can be rejected in advance, namely product stability is poor;
(3) stability judges further: by step (2) at each temperature all normal sample of Product Status carry out Indexs measure, detect respectively and record its viscosity, particle diameter and current potential when 4 DEG C, 25 DEG C, 37 DEG C leave standstill 5 days, 10 days continuously; According to the data of detection record after placement 24h, calculate the rate of change of each at each temperature index between its resting period;
(4) result judges: product viscosity rate of growth is less than 20%, particle diameter rate of growth is less than 5%, potential change rate is less than 3%, judge that product is normal at shelf-life internal stability, there will not be gel, grow dim, be separated bad phenomenon, within the scope of this, viscosity, particle diameter, potential change rate are less, and product stability is better.
The method for rapidly judging of the high fine the stability of milk of above-mentioned neutrality, described step (1) measuring samples prepares 8 to 16 bottles.
The method for rapidly judging of the high fine the stability of milk of above-mentioned neutrality, described step (1) measuring samples prepares 10 bottles, and 4 DEG C, 25 DEG C, 37 DEG C, 50 DEG C at each temperature place ratio be 3:3:3:1.
The method for rapidly judging of the high fine the stability of milk of above-mentioned neutrality, described step (1) measuring samples is filled to the 2/3-4/5 of 350ml aseptic bottle volume, and every bottle of filling amount, error is no more than ± 5ml.
The method for rapidly judging of the high fine the stability of milk of above-mentioned neutrality, detect its viscosity, particle diameter, current potential index after described step (1) sample making completes 24h, detection time, error was no more than 2h.
The method for rapidly judging of the high fine the stability of milk of above-mentioned neutrality, the temperature error of the constant temperature oven of described step (2) 4 DEG C, 25 DEG C, 37 DEG C and 50 DEG C is no more than ± and 2 DEG C.
The invention has the beneficial effects as follows:
1,37 and 50 DEG C of constant temperature ovens are placed the Brownian movement namely accelerating milk protein and fiber the adsorpting aggregation effect of fiber and albumen are strengthened, make again stabilizing agent network structure loose, accelerate the subsidence rate of albumen, accelerate the floating of fat simultaneously, the various deterioration phenomenons of product are showed faster.
2,4 DEG C is the gel that make use of the more serious characteristic aggravation product of colloid low temperature gel, makes it the gel strength judging product faster, to ensure the phenomenon not occurring gel in shelf life of products.
3, the topmost gathering still preventing fiber and albumen of high fine dairy product, when there is not obvious (namely macroscopic) clustering phenomena, viscosity monitoring, the stability that albumen particle diameter is monitored, potential change judges product.
4, the method is used fine for the height dairy product construction cycle can be shortened to 5-10 days by some months.
The present invention substantially reduces the observing time to the fine dairy product stability of height, the primitive decision quality of its stability within 10 days, shorten the construction cycle of product, improve labour productivity, significant to Dairy Enterprise development, also filled up the blank of the neutral high fine the stability of milk of quick judgement simultaneously.
Embodiment
Below in conjunction with embodiment, the present invention is described in further details.
Embodiment 1: neutral high fine the stability of milk method for rapidly judging,
Step is as follows:
(1) sample preparation: according to the large material formula meeting neutral high fine milk requirement, material, homogeneous, UHT137 DEG C in simulated production, 4-6s process for sterilizing, sterile filling is in the transparent aseptic PET bottle of 8 bottles of 350ml, as sample, every bottle of filling amount is at 250ml, every bottle of filling amount error is less than 5ml, place at 4 DEG C, 25 DEG C, 37 DEG C respectively, and after sample making completes 24h, detection record is carried out to sample index at each temperature: viscosity 8-15cp, particle diameter 300-500nm, current potential≤-30mV, detection time, error was less than 2h;
(2) sample stability tentatively sieves and determines: step (1) gained sample is put into each constant temperature oven respectively, according to 4 DEG C, 2 bottles, 25 DEG C, 3 bottles, 37 DEG C, 2 bottles and 50 DEG C, place for 1 bottle, the temperature error of each constant temperature oven is no more than ± and 2 DEG C, leave standstill observation 5 days, if the arbitrary temperature of period sample has gel, grows dim, phenomenon of phase separation, can reject in advance, namely sample stability is poor;
(3) stability judges further: by step (2) at each temperature all normal sample of Product Status carry out Indexs measure, detect respectively and record its viscosity, particle diameter and current potential when 4 DEG C, 25 DEG C, 37 DEG C leave standstill 5 days, 10 days continuously; According to placing 24h determination data, to calculate between its resting period the rate of change of each index at each temperature, viscosity: 5 days rate of change <, 5%, 10 days rate of change < 10%; Particle diameter: increase < for 5 days and increase < 5% in 2%, 10 days; Current potential: 5 days rate of change <, 2%, 10 days rate of change < 3%;
(4) result judges: in sample 5 days, at 4 DEG C, 25 DEG C, 37 DEG C, 50 DEG C temperature, laying state is all normal, in 10 days sample at each temperature index viscosity, particle diameter, potential change rate more miscellaneous goods stability is better, step (3) products obtained therefrom place 10 days at each temperature viscosity rate of growth be less than 10%, particle diameter rate of growth is less than 5%, potential change rate is less than 3%, judge that sample is normal at shelf life internal stability, there will not be gel, grow dim, be separated bad phenomenon.
Embodiment 2: neutral high fine the stability of milk method for rapidly judging,
Step is as follows:
(1) sample preparation: according to the large material formula meeting neutral high fine milk requirement, material, homogeneous, UHT137 DEG C in simulated production, 4-6s process for sterilizing, sterile filling is in the transparent aseptic PET bottle of 10 bottles of 350ml, as sample, every bottle of filling amount is at 280ml, every bottle of filling amount error is less than 5ml, place at 4 DEG C, 25 DEG C, 37 DEG C respectively, and after sample making completes 24h, detection record is carried out to sample index at each temperature: viscosity 8-15cp, particle diameter 300-500nm, current potential≤-30mV, detection time, error was less than 2h;
(2) sample stability tentatively sieves and determines: step (1) gained sample is put into each constant temperature oven respectively, according to 4 DEG C, 3 bottles, 25 DEG C, 3 bottles, 37 DEG C, 3 bottles and 50 DEG C, place for 1 bottle, the temperature error of each constant temperature oven is no more than ± and 2 DEG C, leave standstill observation 5 days, if the arbitrary temperature of period sample has gel, grows dim, phenomenon of phase separation, can reject in advance, namely sample stability is poor;
(3) stability judges further: by step (2) at each temperature all normal sample of Product Status carry out Indexs measure, detect respectively and record viscosity, particle diameter and current potential when it leaves standstill 5 days, 10 days continuously at 4 DEG C, 25 DEG C, 37 DEG C; According to placing 24h data, calculate the rate of change of each at each temperature index between its resting period, viscosity: 5 days rate of change <, 5%, 10 days rate of change < 10%; Particle diameter: increase < for 5 days and increase < 5% in 2%, 10 days; And current potential: 5 days rate of change <, 2%, 10 days rate of change < 3%;
(4) result judges: in sample 5 days, 4 DEG C, 25 DEG C, 37 DEG C, 50 DEG C temperature transfer that to put Product Status all normal, in 10 days sample at each temperature viscosity, particle diameter, potential change rate more miscellaneous goods stability is better, step (3) products obtained therefrom place 10 days at each temperature viscosity rate of growth be less than 10%, particle diameter rate of growth is less than 5%, potential change rate is less than 3%, judge that sample is normal at shelf life internal stability, there will not be gel, grow dim, be separated bad phenomenon.
Embodiment 3: neutral high fine the stability of milk method for rapidly judging,
Step is as follows:
(1) sample preparation: according to the large material formula meeting neutral high fine milk requirement, material, homogeneous, UHT137 DEG C in simulated production, 4-6s process for sterilizing, sterile filling is in the transparent aseptic PET bottle of 16 bottles of 350ml, as measuring samples, every bottle of filling amount is at 240ml, every bottle of filling amount error is less than 5ml, place at 4 DEG C, 25 DEG C, 37 DEG C respectively, and after sample making completes 24h, detection record is carried out to sample index at each temperature: viscosity 8-15cp, particle diameter 300-500nm, current potential≤-30mV, detection time, error was less than 2h;
(2) sample stability tentatively sieves and determines: step (1) gained sample is put into each constant temperature oven respectively, according to 4 DEG C, 5 bottles, 25 DEG C, 5 bottles, 37 DEG C, 4 bottles and 50 DEG C, place for 2 bottles, the temperature error of each constant temperature oven is no more than ± and 2 DEG C, leave standstill observation 5 days, if the arbitrary temperature of period sample has gel, grows dim, phenomenon of phase separation, can reject in advance, namely sample stability is poor;
(3) stability judges further: by step (2) at each temperature all normal sample of Product Status carry out Indexs measure, detect respectively and record its leave standstill continuously at 4 DEG C, 25 DEG C, 37 DEG C 5 days, 10 time viscosity, particle diameter and current potential, according to placing 24h data, calculate the rate of change of each index between its resting period, viscosity: 5 days rate of change <, 5%, 10 days rate of change < 10%; Particle diameter: increase < for 5 days and increase < 5% in 2%, 10 days; And current potential: 5 days rate of change <, 2%, 10 days rate of change < 3%;
(4) result judges: sample transfers 4 DEG C, 25 DEG C, 37 DEG C, 50 DEG C temperature in 5 days that to put Product Status all normal, in 10 days sample at each temperature viscosity, particle diameter, potential change rate more miscellaneous goods stability is better, step (3) products obtained therefrom place 10 days at each temperature viscosity rate of growth be less than 10%, particle diameter rate of growth is less than 5%, potential change rate is less than 3%, judge that sample is normal at shelf life internal stability, there will not be gel, grow dim, be separated bad phenomenon.
Claims (6)
1. a method for rapidly judging for the high fine the stability of milk of neutrality, is characterized in that comprising the steps:
(1) sample preparation: according to the large material formula meeting neutral high fine milk requirement, material, homogeneous, UHT137 DEG C in simulated production, 4-6s process for sterilizing, sterile filling in the transparent aseptic PET bottle of 350ml as sample, place at 4 DEG C, 25 DEG C, 37 DEG C respectively, and to sample index at each temperature after sample making completes 24h: viscosity, particle diameter, current potential index detect, record data;
(2) sample stability tentatively sieves and determines: the constant temperature oven grouping of step (1) gained measuring samples being put into respectively 4 DEG C, 25 DEG C, 37 DEG C and 50 DEG C, leave standstill observation 5 days, observe whether product has gel, grows dim, phenomenon of phase separation, if arbitrary temperature occurs that above phenomenon can be rejected in advance, namely product stability is poor;
(3) stability judges further: by step (2) at each temperature all normal sample of Product Status carry out Indexs measure, detect respectively and record its leave standstill continuously at 4 DEG C, 25 DEG C, 37 DEG C 5 days, 10 time viscosity, particle diameter and current potential, according to the data of placing 24h detection record, calculate the rate of change of each at each temperature index between its resting period;
(4) result judges: product viscosity rate of growth is less than 10%, particle diameter rate of growth is less than 5%, potential change rate is less than 3%, judge that product is normal at shelf-life internal stability, there will not be gel, grow dim, be separated bad phenomenon, in this limit, more miscellaneous goods stability is better for viscosity, particle diameter, potential change rate.
2. the method for rapidly judging of the high fine the stability of milk of neutrality according to claim 1, is characterized in that, described step (1) measuring samples prepares 8 to 16 bottles.
3. the method for rapidly judging of the high fine the stability of milk of neutrality according to claim 2, is characterized in that, described step (1) measuring samples prepares 10 bottles, and 4 DEG C, 25 DEG C, 37 DEG C, 50 DEG C at each temperature place ratio be 3:3:3:1.
4. the method for rapidly judging of the high fine the stability of milk of neutrality according to claim 3, is characterized in that, described step (1) measuring samples is filled to the 2/3-4/5 of 350ml aseptic bottle volume, and every bottle of filling amount, error is no more than ± 5ml.
5. the method for rapidly judging of the high fine the stability of milk of neutrality according to claim 4, is characterized in that, detect its viscosity, particle diameter, current potential index after described step (1) sample making completes 24h, detection time, error was no more than 2h.
6. the method for rapidly judging of the high fine the stability of milk of neutrality according to claim 5, is characterized in that, the temperature error of the constant temperature oven of described step (2) 4 DEG C, 25 DEG C, 37 DEG C and 50 DEG C is no more than ± and 2 DEG C.
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| CN103940783A (en) * | 2014-05-05 | 2014-07-23 | 光明乳业股份有限公司 | Method for predicting shelf-life stability of sterilized milk |
| CN105510541B (en) * | 2015-12-18 | 2017-11-10 | 河北兄弟伊兰食品科技股份有限公司 | A kind of determination of stability method of cashew nut milk drink |
| CN107192741B (en) * | 2017-05-26 | 2019-05-03 | 新希望乳业股份有限公司 | Guaranteed milk pasteurize retention time measuring method |
| CN111260099A (en) * | 2018-11-30 | 2020-06-09 | 内蒙古伊利实业集团股份有限公司 | Prediction method and prediction system for shelf life of liquid milk |
| CN111766353A (en) * | 2020-06-24 | 2020-10-13 | 河北兄弟伊兰食品科技股份有限公司 | Method for rapidly judging stability of drinking yoghourt with long shelf life |
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Address after: 050800 Shijiazhuang County, Zhengding County, Hebei Patentee after: Hebei brothers Ilong food Polytron Technologies Inc Address before: 050800 Shijiazhuang County, Zhengding County, Hebei Patentee before: Shijiazhuang Brothers Ilong Food Ingredients & Additives Co., Ltd. |