Film enrichment method of traditional Chinese medicines
A membrane enrichment and enrichment technology, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of poor sensitivity and low instrument response, and achieve effective sample detection, lower detection limit, and safe and reliable operating environment
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Embodiment 1
[0038] Example 1's investigation of the optimal enrichment time. The specific operation steps are as follows:
[0039] 1. Weigh standard products of protocatechuic aldehyde, caffeic acid, and rosmarinic acid into a 1.5mL centrifuge tube, and add 50% aqueous methanol to prepare a 1000μg / mL solution.
[0040] 2. Weigh 5 mg of graphene oxide and add 25 mL of water, weigh it, and put it in an ultrasonic instrument to mix it ultrasonically until a uniform black dispersion system is formed, take it out, let it stand, weigh it, and make up for the lost weight with water, that is, Graphene oxide nanodispersion.
[0041] 3. Take 5 Erlenmeyer flasks with the specifications of 50mL and number them 1, 2, 3, 4, and 5. Add the same ratio of substances into 5 Erlenmeyer flasks, including 9mL pure water, 1mL graphene oxide nano-dispersion, 15μL protocatechuic acid, 15μL caffeic acid, 15μL rosmarinic acid and 955μL pure water, and weigh . And put 5 Erlenmeyer flasks together into the orbit...
Embodiment 2
[0049] Example 2 Investigation of the instruments used for optimal enrichment. The specific experimental steps are as follows:
[0050] 1. Weigh standard products of protocatechuic aldehyde, caffeic acid, and rosmarinic acid into a 1.5mL centrifuge tube, and add 50% aqueous methanol to prepare a 1000μg / mL solution.
[0051] 2. Weigh 5 mg of graphene oxide and add 25 mL of water, weigh it, and put it in an ultrasonic instrument to mix it ultrasonically until a uniform black dispersion system is formed, take it out, let it stand, weigh it, and make up for the lost weight with water, that is, Graphene oxide nanodispersion.
[0052] 3. Take 3 Erlenmeyer flasks with the specifications of 50mL, numbered 1, 2, and 3. Add the same ratio of substances to three identical Erlenmeyer flasks, including 9 mL of pure water, 1 mL of graphene oxide nano-dispersion, 15 μL of protocatechualdehyde, 15 μL of caffeic acid, 15 μL of rosmarinic acid and 955 μL of pure water, weighing.
[0053] 4....
Embodiment 3
[0060] The investigation of embodiment 3 optimal nano concentration. The specific experimental operation steps are:
[0061] 1. Weigh standard products of protocatechuic aldehyde, caffeic acid, and rosmarinic acid into a 1.5mL centrifuge tube, and add 50% aqueous methanol to prepare a 1000μg / mL solution.
[0062] 2. Weigh 5 mg of graphene oxide and add 25 mL of water, weigh it, and put it in an ultrasonic instrument to mix it ultrasonically until a uniform black dispersion system is formed, take it out, let it stand, weigh it, and make up for the lost weight with water, that is, Graphene oxide nanodispersion.
[0063] 3. Take 4 Erlenmeyer flasks with the specifications of 50mL and number them 1, 2, 3, and 4. The substances added to No. 1 Erlenmeyer flask include: 9.5 mL pure water, 0.5 mL graphene oxide nano-dispersion, 15 μL protocatechuic acid, 15 μL caffeic acid, 15 μL rosmarinic acid and 955 μL pure water; The substances added to the flask include: 9.0mL pure water, 1.0...
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