Preparation method of lemongrass essential oil

A technology of citronella essential oil and citronella, which is applied in the directions of essential oil/spice, fat production, etc., can solve the problems of low extraction rate of citronella essential oil, loss of active components, and high cost, so as to avoid the problem of solvent residue poisoning and avoid active substances. loss, the effect of fast and efficient separation

Pending Publication Date: 2022-04-22
HAINAN TROPICAL OCEAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a preparation method of citronella essential oil, to solve the problem

Method used

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preparation example Construction

[0026] The invention provides a kind of preparation method of citronella essential oil, comprising the following steps:

[0027] S1, sequentially freezing, freeze-drying and pulverizing the citronella grass to obtain freeze-dried citronella grass powder;

[0028] S2, mixing the freeze-dried citronella powder with alcohol solution, and extracting to obtain citronella slurry;

[0029] S3, performing ultrasonic treatment, centrifugation, and filtration on the citronella slurry in sequence to obtain a filtrate;

[0030] S4. Distilling the obtained filtrate to obtain citronella essential oil.

[0031] In the present invention, the citronella grass is preferably fresh citronella grass.

[0032] In the present invention, the step of shredding the citronella grass is preferably included before the freezing in step S1. The specific operation of the shredding is not particularly limited in the present invention, and the conventional shredding method in the art can be used; The citron...

Embodiment 1

[0039] Cut fresh lemongrass into pieces and freeze at -80°C for 1 day, then vacuum freeze-dry at -40°C for 2 days to obtain freeze-dried lemongrass raw materials, and use a multi-functional pulverizer to crush at a speed of 40,000rpm. 5min, obtain freeze-dried citronella powder;

[0040]Weigh 10 g of pulverized freeze-dried citronella powder, add 250 ml of 95% ethanol solution, and magnetically stir at room temperature at 100 rpm for 5 hours to obtain citronella slurry.

[0041] The obtained citronella slurries were placed in an ice bath and subjected to sonication by an ultrasonic cell breaker. The ultrasonic power was 260W, the ultrasonic time was 30min, the working interval was 2s, and the ultrasonic working time was 15min. Filter through a mesh filter to obtain the filtrate.

[0042] The filtrate was subjected to vacuum rotary distillation under the condition of a constant temperature water bath, the rotary evaporation temperature was 60° C., the rotary evaporation speed ...

Embodiment 2

[0044] Cut the fresh lemongrass into pieces and freeze at -70°C for 0.5d, then vacuum freeze-dry at -30°C for 1.5d to obtain the freeze-dried lemongrass raw material, which is crushed by a multi-functional grinder at a crushing speed of 40,000rpm , continued for 5min to obtain freeze-dried citronella powder;

[0045] Weigh 10 g of pulverized freeze-dried citronella powder, add 250 ml of 95% ethanol solution, and magnetically stir at room temperature at 150 rpm for 6 hours to obtain citronella slurry.

[0046] Put the citronella grass slurry in an ice bath, and perform ultrasonic treatment by an ultrasonic cell disruptor. The ultrasonic power is 240W, the ultrasonic time is 25min, the working interval is 2s, and the ultrasonic working time is 12.5min. Filtrate was obtained by strainer filtration.

[0047] The filtrate was subjected to vacuum rotary distillation under the condition of a constant temperature water bath, the rotary evaporation temperature was 65° C., the rotary e...

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Abstract

The invention provides a preparation method of lemongrass essential oil, belongs to the technical field of extraction of plant essential oil, and solves the problems of low extraction rate, serious loss of active ingredients, high cost and the like of lemongrass essential oil in the prior art. The preparation method of the lemongrass essential oil comprises the steps of freezing, freeze-drying, crushing, alcohol extraction, ultrasonic treatment, centrifugation, filtration, distillation and the like, so that the loss of active substances of the lemongrass essential oil and the conditions of hydrolysis, emulsification and the like possibly occurring in the extraction method are effectively avoided, and the stability and the purity of the essential oil can be effectively improved; the essential oil can be separated more quickly and efficiently, and active substances are protected to a certain extent. According to the preparation method disclosed by the invention, the extraction efficiency of the lemongrass essential oil is improved, the final extraction rate of the lemongrass essential oil under the conditions disclosed by the invention can reach 6.7%, the proportion of the main active ingredient citral reaches 52%, and the extraction efficiency and the yield of the essential oil are effectively improved.

Description

technical field [0001] The invention relates to the technical field of plant essential oil extraction, in particular to a preparation method of citronella essential oil. Background technique [0002] Lemongrass (Cymbopogon citratus), also known as lemongrass and lemongrass, is native to tropical and subtropical regions of Asia, and is currently widely cultivated in many provinces in South China and Southwest my country. Lemongrass is widely used in food cooking, seasoning production, chemical component extraction and synthesis and other fields. As a natural herb, citronella has a certain application potential in the extraction of plant essential oils. Lemongrass essential oil has a unique lemon fragrance, mainly composed of active compounds such as aldehydes, alcohols, lipids, alkenes, among which citral, as its main component, has good antioxidant and antibacterial effects, and as a natural The application of plant essential oils and citronella essential oils in today's f...

Claims

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Application Information

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IPC IPC(8): C11B9/02
CPCC11B9/02C11B9/022C11B9/025C11B9/027
Inventor 胡亚芹吕青胡之恒黄朝晖卢紫腈吴梅艳
Owner HAINAN TROPICAL OCEAN UNIV
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