Enzyme-aided pearl glossing process

A pearl and enzymatic technology, applied in jewelry, clothing, applications, etc., can solve problems that affect light transmission, reflection and refraction, and affect pearl luster

Active Publication Date: 2006-11-22
ZHEJIANG RUANS PEARL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The luster of pearls is mainly determined by the physical structure of calcium carbonate aragonite crystals, which are difficult to improve by chemical and physical methods at this level; however, the lipids and proteins attached to the outer layer will affect the transmission and reflection of light and refraction, thus affecting the luster of pearls

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Classification means roughly classifying pearls according to the thickness, color, luster, shape and size of the nacre, so as to deal with them separately.

[0045] (2) Surface pretreatment Wrap the pearls in gauze and heat them in a water bath. The temperature is generally controlled at 50°C for 80 hours, so that most of the pigments are decomposed to facilitate bleaching;

[0046] Take 5.59 g of dipotassium hydrogen phosphate and 0.41 g of potassium dihydrogen phosphate and dissolve them in water to 1000 ml to prepare a phosphate buffer (pH=8.5). Add 50ml of phosphate buffer solution, 30 pearls, and 0.5g of compound protease (1%) into the Erlenmeyer flask; place it in a constant temperature water bath at 35°C for 15 hours, pour off the reaction solution, rinse it with water repeatedly, and dissolve the fluorescent whitening agent OB Add 2.5 grams to 1250ml of methanol, ultrasonic treatment to completely dissolve. Put 1000 grams of enzyme-treated pearls into this ...

Embodiment 2

[0048] (1) Classification means roughly classifying pearls according to the thickness, color, luster, shape and size of the nacre, so as to deal with them separately.

[0049] (2) Surface pretreatment Wrap the pearls in gauze and heat them in a water bath. The temperature is generally controlled at about 55°C for 30 hours, so that most of the pigments are decomposed to facilitate bleaching;

[0050] Weigh 1.25 g of Aspergillus protease, dissolve it in 1250 mL of deionized water (pH 6.4), and adjust the pH of the solution to 6.0 with 1.3 mL of saturated sodium carbonate solution. Put 1000 grams of pearls into the Aspergillus protease solution, take it out in a 40°C water bath, take it out after 7 hours, rinse it repeatedly, and dry it in the air. Add 2.5 grams of fluorescent whitening agent OB to 1250ml of methanol, and ultrasonically treat it to completely dissolve it. Put 1,000 grams of enzyme-treated pearls into this system, place them in a light box at room temperature, ta...

Embodiment 3

[0052] (1) Classification means roughly classifying pearls according to the thickness, color, luster, shape and size of the nacre, so as to deal with them separately.

[0053] (2) Surface pretreatment Wrap the pearls in gauze and heat them in a water bath. The temperature is generally controlled at about 60°C for 3 hours, so that most of the pigments are decomposed to facilitate bleaching;

[0054] Take 7.59 g of dipotassium hydrogen phosphate and 2.41 g of potassium dihydrogen phosphate and add water to dissolve to 1000 ml to prepare phosphate buffer (pH=7.5). Add 50ml of phosphate buffer solution, 30 pearls, and 1.0g of Aspergillus protease (2%) into the Erlenmeyer flask; place it in a constant temperature water bath at 53°C for 5 hours, pour off the reaction solution, rinse it with water repeatedly, and dissolve the fluorescent whitening agent PRS Add 1.25 grams to 1250ml deionized water, and ultrasonically treat it to dissolve completely.

[0055] Put 1,000 grams of enzym...

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PUM

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Abstract

The present invention relates to pearl post-treating process, and is especially one pearl treating process, in which bioactive enzyme is used in treating pearl to raise pearl brightness. The enzymatic pearl treating process includes the following steps: pre-treatment; compounding buffering liquid or saturated sodium carbonate solution; brightening pearl with enzyme preparation; brightening pearl with fluorescent brightener and others. Bioactive enzyme with biocatalytic effect in buffering liquid environment is utilized to eliminate attached matter in the surface of pearl for exposing bright pearl aragonite crystal, and the fluorescent brightener is used to shorten the brightening period.

Description

technical field [0001] The invention relates to a post-treatment process for pearls, in particular to a treatment process for improving the luster of pearls by treating the surface of pearls with biologically active enzymes. Background technique [0002] Pearl is a kind of biomineralized tissue secreted by the mantle cells of some mollusc bivalve shellfish during the metabolic process. It has a unique crystal structure. Concentric spheres in which thin layers of protein are arranged at alternating intervals. The chemical composition of pearls is mainly inorganic components such as calcium carbonate, supplemented by shell keratin, water, and trace elements are S, P, Na, Mg, Al, Fe, Cu, Ag, Ti, K, Sr, etc. Amino acids are Asparagus, Su, Silk, Gu, Gan, C, Cysteine, Valerian, Egg, Isolate, Bright, Casein, Styrene, Lai, Group, Essence, Auxiliary, Color, etc. Pearls possess all gemological characteristics: namely, specific colour, luster, hue, transparency, shape and size, densi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A44C27/00
Inventor 阮铁军王伟忠楼文成
Owner ZHEJIANG RUANS PEARL LTD
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