CN100384334C - Test paper for quick judging sulfuring steamed bread and its preparation method - Google Patents
Test paper for quick judging sulfuring steamed bread and its preparation method Download PDFInfo
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- CN100384334C CN100384334C CNB2004100605886A CN200410060588A CN100384334C CN 100384334 C CN100384334 C CN 100384334C CN B2004100605886 A CNB2004100605886 A CN B2004100605886A CN 200410060588 A CN200410060588 A CN 200410060588A CN 100384334 C CN100384334 C CN 100384334C
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Abstract
The present invention discloses test paper for quickly authenticating sulphurated steamed bread, and a preparation method thereof. The components of iodine, potassium iodide and starch are contained in filter paper which serves as a carrier of the test paper. The test paper is formed by sufficiently dipping the filter paper in the mixed liquor of iodine solution, starch solution and distilled water, and then drying the filter paper. The present invention has the advantages of simple manufacture of the test paper, low cost, accurate authenticating of a sample, good repeatability and simple operation. The present invention can be conveniently used for monitoring and managing the production field and the selling field of the steamed bread, and overcomes the defects of time wasting, labor wasting, etc. when a traditional experimental method is used for testing sulphurated steamed bread. The present invention has a good use prospect.
Description
Technical field
The present invention relates to a kind of preparation method of quick discriminating test paper, particularly a kind of preparation method who is used for the quick discriminating test paper of sulphuring steamed bun.
Background technology
Steamed bun is the modal a kind of staple food kind of northern China, also is a kind of dessert that China south people like, has important status in the food of China.In traditional steamed bun manufacture craft, people's sulfur fumigation commonly used is to reach the purpose of improving the steamed bun color and luster.But scientific research is the result show, when the residual quantity of sulfur dioxide in the steamed bun reached 40ppm, residual sulfur dioxide just can begin to destroy the Cobastab in the steamed bun
1, reduced the nutritive value of steamed bun.When the residual quantity of sulfur dioxide in the steamed bun reached 200ppm, residual sulfur dioxide just can begin direct insulting liver.Based on the harm of sulfur fumigation steamed bun to health of people, China's food additive regulations has been prohibited sulphuring in steamed bun is produced.But, just need measure fast a large amount of on-the-spot samples because the dispersiveness of present steamed bun production and selling will be finished effective monitoring.What the residual quantity of sulfur dioxide adopted usually in the experimental determination steamed bun at present is the hydrochloric para-rosaniline method and the way of distillation (GB/T5009.34-1996), but because these methods need special instrument and equipment, need in the laboratory, finish, can't satisfy the requirement of field quick detection, and method of operating is comparatively numerous and diverse, and required drug variety is more, and required detection time is longer, cost is higher, is difficult to satisfy the needs to the field management of steamed bun production and selling.Along with the government and the people more and more pay attention to food security, the fast and low-cost discrimination method of research sulphuring steamed bun seems necessary and urgent.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of sulphuring steamed bun to differentiate the preparation method of test paper fast.
For achieving the above object, the present invention adopts following technical scheme: a kind of sulphuring steamed bun is differentiated the preparation method of test paper fast, specifically comprise the steps: (1) preparation iodine solution, taking by weighing the 3.6g KI is dissolved in the 20mL distilled water, add 1.35g iodine, it is standby that dissolving back adding distil water dilution constant volume makes iodine standard solution to 100mL, again iodine standard solution made iodine solution for 10 times with distilled water diluting before the use; (2) the preparation starch solution takes by weighing the 1g soluble starch, with 8～12mL room temperature distilled water furnishing pasty state, slowly in the distilled water of impouring 80mL boiling, with adding with stirring, boils and puts coldly after 2 minutes, and constant volume is standby to 100mL then, and this solution should face the time spent and prepare; (3) get 0.75～1.25 part of iodine solution, 7.5～12.5 parts of starch solutions, distilled water mixes in container for 12～19 parts; (4) earlier filter paper is cut into the rectangle paper slip, the end with the filter paper bar inserts in the solution that has mixed again, is soaked into into navy blue until whole filter paper bar, and drying promptly makes then.
Last drying program adopts hair dryer or drying box oven dry in the described step (4), and bake out temperature is 50～60 ℃.
Being used to of adopting that the inventive method makes differentiates that the advantage of the quick discriminating test paper of sulphuring steamed bun is: detect test paper and make simple, with low cost; Sample is differentiated accurately, good reproducibility; Simple to operate, can be used for the production scene of steamed bun easily and sell on-the-spot supervision and management, overcome deficiency such as waste time and energy when using traditional experimental technique that the sulphuring steamed bun is detected, have good use prospect.
The specific embodiment
Embodiment 1
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: (1) preparation iodine solution, taking by weighing the 3.6g KI is dissolved in the 20mL distilled water, add 1.35g iodine, it is standby that dissolving back adding distil water dilution constant volume makes iodine standard solution to 100mL, again iodine standard solution made iodine solution for 10 times with distilled water diluting before the use.(2) the preparation starch solution takes by weighing the 1g soluble starch, with 8mL room temperature distilled water furnishing pasty state, slowly in the distilled water of impouring 80mL boiling, with adding with stirring, boil put after 2 minutes cold, the adding distil water constant volume is standby to 100mL then, and starch concentration is 10g/L, and this solution should face the time spent preparation.(3) get 0.75 part of iodine solution, 7.5 parts of starch solutions, distilled water mixes in container for 12 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 50～52 ℃.
Embodiment 2
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1) is with embodiment 1.(2) the preparation starch solution takes by weighing the 1g soluble starch, with 8.25mL room temperature distilled water furnishing pasty state, slowly in the distilled water of impouring 80mL boiling, with adding with stirring, boil put after 2 minutes cold, the adding distil water constant volume is standby to 100mL then, and starch concentration is 10g/L, and this solution should face the time spent preparation.(3) get 0.75 part of iodine solution, 8.5 parts of starch solutions, distilled water mixes in container for 13 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 52～54 ℃.
Embodiment 3
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1) is with embodiment 1.(2) the preparation starch solution takes by weighing the 1g soluble starch, with 8.5mL room temperature distilled water furnishing pasty state, slowly in the distilled water of impouring 80mL boiling, with adding with stirring, boil put after 2 minutes cold, the adding distil water constant volume is standby to 100mL then, and starch concentration is 10g/L, and this solution should face the time spent preparation.(3) get 0.75 part of iodine solution, 9.5 parts of starch solutions, distilled water mixes in container for 14 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 54～56 ℃.
Embodiment 4
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1) is with embodiment 1.(2) the preparation starch solution takes by weighing the 1g soluble starch, with 8.75mL room temperature distilled water furnishing pasty state, slowly in the distilled water of impouring 80mL boiling, with adding with stirring, boil put after 2 minutes cold, the adding distil water constant volume is standby to 100mL then, and starch concentration is 10g/L, and this solution should face the time spent preparation.(3) get 0.75 part of iodine solution, 10.5 parts of starch solutions, distilled water mixes in container for 15 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 56～58 ℃.
Embodiment 5
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1) is with embodiment 1.(2) the preparation starch solution takes by weighing the 1g soluble starch, with 9mL room temperature distilled water furnishing pasty state, slowly in the distilled water of impouring 80mL boiling, with adding with stirring, boil put after 2 minutes cold, the adding distil water constant volume is standby to 100mL then, and starch concentration is 10g/L, and this solution should face the time spent preparation.(3) get 0.75 part of iodine solution, 11.5 parts of starch solutions, distilled water mixes in container for 16 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 58～60 ℃.
Embodiment 6
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1) is with embodiment 1.(2) the preparation starch solution takes by weighing the 1g soluble starch, with 9.25mL room temperature distilled water furnishing pasty state, slowly in the distilled water of impouring 80mL boiling, with adding with stirring, boil put after 2 minutes cold, the adding distil water constant volume is standby to 100mL then, and starch concentration is 10g/L, and this solution should face the time spent preparation.(3) get 0.85 part of iodine solution, 12.5 parts of starch solutions, distilled water mixes in container for 17 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 50～51 ℃.
Embodiment 7
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1) is with embodiment 1.(2) the preparation starch solution takes by weighing the 1g soluble starch, with 9.5mL room temperature distilled water furnishing pasty state, slowly in the distilled water of impouring 80mL boiling, with adding with stirring, boil put after 2 minutes cold, the adding distil water constant volume is standby to 100mL then, and starch concentration is 10g/L, and this solution should face the time spent preparation.(3) get 0.95 part of iodine solution, 8 parts of starch solutions, distilled water mixes in container for 18 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 51～52 ℃.
Embodiment 8
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1) is with embodiment 1.(2) the preparation starch solution takes by weighing the 1g soluble starch, with 9.75mL room temperature distilled water furnishing pasty state, slowly in the distilled water of impouring 80mL boiling, with adding with stirring, boil put after 2 minutes cold, the adding distil water constant volume is standby to 100mL then, and starch concentration is 10g/L, and this solution should face the time spent preparation.(3) get 1.05 parts of iodine solutions, 9 parts of starch solutions, distilled water mixes in container for 19 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 53～54 ℃.
Embodiment 9
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1) is with embodiment 1.(2) the preparation starch solution takes by weighing the 1g soluble starch, with 10mL room temperature distilled water furnishing pasty state, slowly in the distilled water of impouring 80mL boiling, with adding with stirring, boil put after 2 minutes cold, the adding distil water constant volume is standby to 100mL then, and starch concentration is 10g/L, and this solution should face the time spent preparation.(3) get 1.15 parts of iodine solutions, 10 parts of starch solutions, distilled water mixes in container for 12.5 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 54～55 ℃.
Embodiment 10
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1) is with embodiment 1.(2) the preparation starch solution takes by weighing the 1g soluble starch, with 10.25mL room temperature distilled water furnishing pasty state, slowly in the distilled water of impouring 80mL boiling, with adding with stirring, boil put after 2 minutes cold, the adding distil water constant volume is standby to 100mL then, and starch concentration is 10g/L, and this solution should face the time spent preparation.(3) get 1.25 parts of iodine solutions, 11 parts of starch solutions, distilled water mixes in container for 13.5 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 55～56 ℃.
Embodiment 11
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1) is with embodiment 1.(2) the preparation starch solution takes by weighing the 1g soluble starch, with 10.5mL room temperature distilled water furnishing pasty state, slowly in the distilled water of impouring 80mL boiling, with adding with stirring, boil put after 2 minutes cold, the adding distil water constant volume is standby to 100mL then, and starch concentration is 10g/L, and this solution should face the time spent preparation.(3) get 0.8 part of iodine solution, 12 parts of starch solutions, distilled water mixes in container for 14.5 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 56～57 ℃.
Embodiment 12
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1) is with embodiment 1.(2) the preparation starch solution takes by weighing the 1g soluble starch, with 10.75mL room temperature distilled water furnishing pasty state, slowly in the distilled water of impouring 80mL boiling, with adding with stirring, boil put after 2 minutes cold, the adding distil water constant volume is standby to 100mL then, and starch concentration is 10g/L, and this solution should face the time spent preparation.(3) get 0.9 part of iodine solution, 11.75 parts of starch solutions, distilled water mixes in container for 15.5 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 57～58 ℃.
Embodiment 13
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1) is with embodiment 1.(2) the preparation starch solution takes by weighing the 1g soluble starch, with 11mL room temperature distilled water furnishing pasty state, slowly in the distilled water of impouring 80mL boiling, with adding with stirring, boil put after 2 minutes cold, the adding distil water constant volume is standby to 100mL then, and starch concentration is 10g/L, and this solution should face the time spent preparation.(3) get 1 part of iodine solution, 11.25 parts of starch solutions, distilled water mixes in container for 16.5 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 58～59 ℃.
Embodiment 14
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1) is with embodiment 1.(2) the preparation starch solution takes by weighing the 1g soluble starch, with 11.25mL room temperature distilled water furnishing pasty state, slowly in the distilled water of impouring 80mL boiling, with adding with stirring, boil put after 2 minutes cold, the adding distil water constant volume is standby to 100mL then, and starch concentration is 10g/L, and this solution should face the time spent preparation.(3) get 1.1 parts of iodine solutions, 9.75 parts of starch solutions, distilled water mixes in container for 17.5 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 59～60 ℃.
Embodiment 15
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1) is with embodiment 1.(2) the preparation starch solution takes by weighing the 1g soluble starch, with 11.5mL room temperature distilled water furnishing pasty state, slowly in the distilled water of impouring 80mL boiling, with adding with stirring, boil put after 2 minutes cold, the adding distil water constant volume is standby to 100mL then, and starch concentration is 10g/L, and this solution should face the time spent preparation.(3) get 1.2 parts of iodine solutions, 8.25 parts of starch solutions, distilled water mixes in container for 18.5 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 50～55 ℃.
Embodiment 16
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1) is with embodiment 1.(2) the preparation starch solution takes by weighing the 1g soluble starch, with 11.75mL room temperature distilled water furnishing pasty state, slowly in the distilled water of impouring 80mL boiling, with adding with stirring, boil put after 2 minutes cold, the adding distil water constant volume is standby to 100mL then, and starch concentration is 10g/L, and this solution should face the time spent preparation.(3) get 0.75 part of iodine solution, 12.5 parts of starch solutions, distilled water mixes in container for 19 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 55～60 ℃.
Embodiment 17
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1) is with embodiment 1.(2) the preparation starch solution takes by weighing the 1g soluble starch, with 12mL room temperature distilled water furnishing pasty state, slowly in the distilled water of impouring 80mL boiling, with adding with stirring, boil put after 2 minutes cold, the adding distil water constant volume is standby to 100mL then, and starch concentration is 10g/L, and this solution should face the time spent preparation.(3) get 0.75 part of iodine solution, 12.5 parts of starch solutions, distilled water mixes in container for 12 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 50～55 ℃.
Embodiment 18
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1), (2) are with embodiment 1.(3) get 0.75 part of iodine solution, 7.5 parts of starch solutions, distilled water mixes in container for 19 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 55～60 ℃.
Embodiment 19
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1), (2) are with embodiment 1.(3) get 1.25 parts of iodine solutions, 12.5 parts of starch solutions, distilled water mixes in container for 19 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 50～55 ℃.
Embodiment 20
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1), (2) are with embodiment 1.(3) get 1.25 parts of iodine solutions, 12.5 parts of starch solutions, distilled water mixes in container for 12 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 55～60 ℃.
Embodiment 21
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1), (2) are with embodiment 1.(3) get 1.25 parts of iodine solutions, 7.5 parts of starch solutions, distilled water mixes in container for 19 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 50～55 ℃.
Embodiment 22
Make the step of the quick discriminating test paper of sulphuring steamed bun of the present invention: step (1), (2) are with embodiment 1.(3) get 1.25 parts of iodine solutions, 7.5 parts of starch solutions, distilled water mixes in container for 12 parts.At this moment, mixed liquor is black-and-blue.(4) earlier filter paper is cut into 7mm * 50mm rectangle paper slip, end with the filter paper bar inserts in the solution that has mixed again, soaked into into navy blue until whole filter paper bar, promptly make the quick discriminating test paper of sulphuring steamed bun of the present invention then with hair dryer or drying box oven dry, bake out temperature is 55～60 ℃.
The sulphuring steamed bun that the various embodiments described above make differentiates that fast the using method of test paper is as follows:
For fresh steamed bun, because steamed bun is inner moist soft, can directly steamed bun be broken into two with one's hands during use, it is middle and stay one little section outside that blue discriminating test paper is clipped in steamed bun, clamp then, open after 5 minutes and observe the change color that is clipped in one section middle test paper of steamed bun.Original color of the one little section test paper in steamed bun outside is stayed in contrast, the blueness of differentiating test paper is obviously shoaled even become white steamed bun to be the sulphuring steamed bun.What color was constant substantially is the steamed bun of not handling through sulphuring.Because if remaining sulfur dioxide is arranged in the steamed bun, the molecular iodine in can reduction under the moisture state blue iodine-starch compound, thus the blueness of test paper is obviously shoaled even disappear (reaction equation: SO
2+ H
2O=H
2SO
3, H
2SO
3+ H
2O+I
2=H
2SO
4+ 2HI).
For the steamed bun of displaying,, re-use after making test paper moisturize because the inner hardening drying of steamed bun needs with little sprayer a small amount of distilled water is sprayed on the discriminating test paper earlier.Below use and judge sulphuring whether method is with fresh steamed bun.
Claims (2)
1. a sulphuring steamed bun is differentiated the preparation method of test paper fast, it is characterized in that comprising the steps: (1) preparation iodine solution, taking by weighing the 3.6g KI is dissolved in the 20mL distilled water, add 1.35g iodine, it is standby that dissolving back adding distil water dilution constant volume makes iodine standard solution to 100mL, again iodine standard solution made iodine solution for 10 times with distilled water diluting before the use; (2) the preparation starch solution takes by weighing the 1g soluble starch, with 8～12mL room temperature distilled water furnishing pasty state, slowly in the distilled water of impouring 80mL boiling, with adding with stirring, boils and puts coldly after 2 minutes, and constant volume is standby to 100mL then, and this solution should face the time spent and prepare; (3) get 0.75～1.25 part of iodine solution, 7.5～12.5 parts of starch solutions, distilled water mixes in container for 12～19 parts; (4) earlier filter paper is cut into the rectangle paper slip, the end with the filter paper bar inserts in the solution that has mixed again, is soaked into into navy blue until whole filter paper bar, and drying promptly makes then.
2. a kind of sulphuring steamed bun as claimed in claim 1 is differentiated the preparation method of test paper fast, it is characterized in that: last drying program adopts hair dryer or drying box oven dry in the described step (4), and bake out temperature is 50～60 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100605886A CN100384334C (en) | 2004-10-27 | 2004-10-27 | Test paper for quick judging sulfuring steamed bread and its preparation method |
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|---|---|---|---|
| CNB2004100605886A CN100384334C (en) | 2004-10-27 | 2004-10-27 | Test paper for quick judging sulfuring steamed bread and its preparation method |
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| Publication Number | Publication Date |
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| CN1765187A CN1765187A (en) | 2006-05-03 |
| CN100384334C true CN100384334C (en) | 2008-04-30 |
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| CN105911050A (en) * | 2016-04-14 | 2016-08-31 | 梧州市产品质量检验所 | Method for determining residual amount of sulfur dioxide in Guiling jelly powder |
| CN111579732A (en) * | 2020-07-07 | 2020-08-25 | 天津浑天科技有限公司 | Natural gas smell identification packaging test paper and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1135603A (en) * | 1995-05-11 | 1996-11-13 | 南京铁道医学院 | Method for making fifteen kinds of test paper for quickly testing common chemical contamination in food |
| CN2295215Y (en) * | 1996-07-29 | 1998-10-21 | 昌吉市卫生防疫站 | Iodine-salt test paper |
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| 几种二氧化硫定性检测方法灵敏度的分析. 王岱峰等.辽宁农业科学，第5期. 1997 * |
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