From Fresh Herb To Extract: The Processing Transformation And Value Elevation Of Cistanche

Cistanche, also known as golden bamboo shoot, earth essence, or Dayun, refers to the fleshy stem of a perennial parasitic herb in the Orobanchaceae family. It grows in deserts and Gobi areas, absorbing nutrients from the roots of psammophytes such as Haloxylon ammodendron and tamarisk, and is widely praised as the "Ginseng of the Desert".

Chinese herb cistanche

As a precious traditional Chinese medicinal material, it was listed as a top-grade herb in Shennong's Classic of Materia Medica as early as ancient times, which records: "Sweet in taste, slightly warm in nature; mainly treats five consumptions and seven impairments, tonifies the middle, eliminates cold and heat pain in the genital tract, nourishes the five zang-organs, strengthens yin, and benefits essence and qi."

Modern research has confirmed that Cistanche is rich in phenylethanoid glycosides, polysaccharides, alkaloids, and other active ingredients. It exerts multiple effects such as tonifying kidney-yang, replenishing essence and blood, moistening the intestines to relieve constipation, and resisting oxidation. It is widely used in medicine, health products, cosmetics, and other fields.

Fresh Cistanche has high moisture content, crisp and tender texture, and is prone to decay, making long-term storage and transportation impossible, with low utilization of active ingredients. After thousands of years of practice, a mature processing system has been developed: fresh products are processed into dried products, and further extracted and purified to obtain extracts, realizing the transformation from "natural raw material" to "high value-added product". This paper elaborates on the complete processing flow and analyzes the core technologies and quality control standards of each step.

Fresh Cistanche: Source Control and Primary Processing

Cistanche tubulosa is a nourishing legend that crosses regions

The quality of fresh products directly determines the quality of subsequent products. The core objectives of primary processing are "preserving freshness, removing impurities, and stabilizing activity", mainly including three key steps: standardized harvesting, sorting and cleaning, and cutting.

1.1 Fresh Harvesting: Timely and Scientific Collection

Harvesting of Cistanche is highly seasonal. Early harvesting results in insufficient active ingredients, while late harvesting leads to severe lignification and degraded quality. Its growth cycle is 3–5 years, with concentrated harvesting in spring and autumn:

"Spring Cistanche", harvested from March to May, has plump flesh, the highest content of active ingredients, and the best quality.;

"Autumn Cistanche", harvested from September to October, is slightly inferior in quality but sufficient for processing.

At present, more than 98% of Cistanche on the market is artificially cultivated, mainly produced in desert areas such as Alxa in Inner Mongolia (accounting for over 90% of the national output) and the Taklamakan Desert in Xinjiang, balancing ecological sand fixation and economic value.

Harvesting follows the principle of "moderate collection and ecological protection" and is conducted manually: The growth position is judged by sand surface bulges; sand is gently brushed aside to expose the fleshy stem; a sharp cutter is used to cut the connection with the host root; the stem is pulled out gently to avoid damage, wrapped in clean gauze immediately, and transported to the processing site as soon as possible to prevent water loss and degradation of active ingredients caused by high temperature and strong ligh. After harvesting, screening is carried out instantly to remove rotten, worm-eaten, and lignified individuals, as well as surface sand and impurities.

Chinese herb cistanche

1.2 Sorting and Cleaning: Removing Impurities while Protecting the Epidermis

After sorting, Cistanche is graded by size:

Large: diameter ≥ 5 cm, length ≥ 30 cm;

Medium: diameter 3–5 cm, length 20–30 cm;

Small: diameter ＜ 3 cm, length ＜ 20 cm.

This facilitates uniform processing and product grading.Cleaning adopts a "stepwise mild decontamination" method:

Rinse floating sand with running water and gently brush with a soft-bristle.sh;

Soak Cistanche for 10–15 minutes to remove stubborn sand (prolonged soaking may cause loss of active ingredients).

Rinse again and dry the surface water.

Water temperature is controlled at 15–25 °C, and temperatures above 35 °C are avoided to prevent damage to active ingredients. Water must meet drinking water standards. Cleaned products must be transferred to cutting within 24 hours; if not processed immediately, they should be stored in a cool, ventilated environment at 10–15 °C with relative humidity below 60%.

1.3 Cutting: Standardized Slicing for Improved Efficiency

Processing of sliced Cistanche tubulosa

Fresh Cistanche is crisp and tender. Cutting increases surface area, accelerates drying, and facilitates subsequent processing. The core requirements are "uniform slices, no breakage, minimal scraps".Before cutting, quality is rechecked,d and unqualified individuals are removed. Cutting tools are disinfected with 75% alcohol or boiling water.

Small-scale processing: manual cutting into 2–3 mm thin slices or 3–5 cm segments, flexible but low-efficiency with poor uniformity;

Large-scale processing: special slicers with thickness adjusted to 2–3 mm, high-efficiency and uniform, but with higher equipment investment.

After cutting, slices are spread at a thickness of 1–2 cm without overlapping, and transferred to drying within 2 hours to prevent deterioration and deformation.

Through the above steps, fresh Cistanche is transformed into clean and uniform slices, laying a foundation for dried product processing, with strict quality control at every stage.

Dried Cistanche: Drying, Stabilizationi and Quality Improvement

Fresh Cistanche slices have a moisture content of 70%–80% and are perishable. Drying reduces moisture to a safe level and stabilizes active ingredients, with core objectives: "dehydration, activity preservation, and quality fixation".Drying methods are divided into traditional and modern types: modern methods dominate large factories, while traditional methods are suitable for small-scale processing.

Cistanche tubulosa slice

2.1 Traditional Drying Methods: Natural, Sim,ple and Efficient

Based on sunlight and wind, no complex equipment, low cost, suitable for small processing.

2.1.1 Natural Sun Drying

Slices are evenly spread 1–2 cm thick on a flat, dry, sunny, pollution-free site, turned 2–3 times daily, and dried for 3–5 days (adjusted by weather).Qualified drying standard: pale yellow appearance, dry and glossy surface, hard and crisp texture, moisture content 12%–15%.After cooling to room temperature, products are packed in breathable bags and stored in a cool, ventilated, dark warehouse.

Advantages: low cost, natural flavor retained.Disadvantages: greatly affected by weather, low efficiency, unstable quality, and easy contamination.

2.1.2 Shade Drying

Suitable for rainy or low-sunlight areas. Slices are placed in a cool, ventilated, dark place, spread 1–2 cm thick, turned daily, and dried for 7–10 days. Advantages: complete retention of active ingredients, stable quality.Disadvantages: extremely low efficiency, only for small-batch processing.

2.2 Modern Drying Methods: Scientific, Controllable, and Stable Quality

Mainstream methods: hot air drying, vacuum drying, freeze drying. Hot air drying is the most widely used; the latter two are for high-end products.

2.2.1 Hot Air Drying: Efficient, CConvenientt and Moderate Cost

Core equipment: hot air dryer (small: 50–100 kg/day; large production line: over 1000 kg/day), with precise temperature, humidity, and airspeed control.Three-stage drying:

Preheating: 40–50 °C for 1–2 h;

Constant rate: 60–70 °C for 3–4 h;

Deceleration: 50–60 °C for 1–2 h.

Humidity: 30%–40%.Slicare es spread 1–2 cm thick. Active ingredient retention rate: above 85%.

2.2.2 Vacuum Drying: Low Temperature, High Activity Retention

Vacuum degree: 0.06–0.08 MPa; temperature: 30–40 °C; slice thickness: 0.5–1 cm.Active ingredient retention rate: above 90%.Advantages: low-temperature protection, excellent quality, high purity.Disadvantages: high equipment andoperation costst, lower efficiency than hot air drying.

2.2.3 Freeze Drying: Ultimate Activity Preservation

Most advanced drying method.Slices pre-frozen to −40 °C to −30 °C for 2–3 h; vacuumed to 0.001–0.005 MPa; sublimation drying for 8–12 h; desorption drying for 2–3  h.Moisture content: 12%–15%.Product: loose, porous, easy to pulverize.Active ingredient retention rate: above 95%.Advantages: premium quality, high purity.Disadvantages: extremely high cost, low eefficiency and only for high-end products.

2.3 Quality Control and Storage of Dried Cistanche

2.3.1 Quality Standards for High-Quality Dried Cistanche

Cistanche tubulosa slice

Appearance: pale yellow, uniform slices, no impurities;

Texture: hard and crisp (or loose and porous);

Odor: characteristic sweet aroma;

Moisture: 12%–15%;

Active ingredients: echinacoside ≥ 1.0%, verbascoside ≥ 0.2%, polysaccharides ≥ 10%;

Hygiene: in line with traditional Chinese medicinal material standards.

2.3.2 Storage and Maintenance

Core requirements: moisture-proof, insect-proof, mold-proof, light-proof, high-temperature-proof.Storage conditions: 10–20 °C, relative humidity < 60%, breathable and sealed packaging, with desiccants and insect repellents (isolated from products).Shelf life: 1–2 years (2–3 years for freeze-dried products).

Dried Cistanche is an important intermediate in the processing chain, directly used in TCM prescriptions and health product processing.

Cistanche Extract: Enrichment of Active Ingredients and Value Elevation

cistanche powder

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Dried Cistanche is hard and has low bioavailability. Extraction and purification enrich active ingredients to produce high-value-added extracts for high-end applications. Core steps: raw material pretreatment, extraction, purification, concentration, drying.

3.1 Raw Material Pretreatment: Pulverization and Sieving

Core objectives: uniform pulverization, controlled particle size,and  impurity removal.

3.1.1 Pulverization

Increases surface area and breaks cell structure.Particle size:

Small processing: 80–100 mesh;

Medium: 100–120 mesh;

High-end: 200–300 mesh (superfine pulverization).

3.1.2 Sieving

80–120 mesh (150–200 mesh for high-end). Coarse particles re-pulverized.

3.1.3 Degreasing (Optional)

For high-end extracts: remove lipid impurities with petroleum ether, solvent-to-material ratio 8–10:1, 25–30 °C for 30–60 min. Solvent recovered and reused.

3.2 Extraction Technology

Core: efficient extraction of active ingredients with minimal impurities. Phenylethanoid glycosides and alkaloids are lipophilic/semi-lipophilic; polysaccharides are water-soluble.

3.2.1 Solvent Selection

Water: for water-soluble ingredients, low cost, high impurities;

Ethanol (60%–80%): most widely used, broad-spectrum extraction; Methanol/acetone: laboratory only, toxic or high-purity use.

3.2.2 Common Extraction Methods

Reflux ExtractionMaterial-to-liquid ratio 1:8–1:12, 78 °C, 1.5–2 h, repeated 1–2 times.Simple, low-cost, large-scale.

Ultrasound-Assisted Extraction40–50 °C, 200–400 W, 30–60 min.High efficiency (>95% yield), low temperature, and time-saving.

Microwave-Assisted Extraction: Fast, selective, high efficiency. Requires precise parameter control.

3.3 Purification, Concentration, and Drying

Crude extract is purified by filtration, centrifugation, extraction, column chromatography, or membrane separation. Purified extract is concentrated under reduced pressure (low temperature).Drying methods:

Vacuum drying;

Freeze drying (high-end);

Spray drying (large-scale powder).

Final products are tested for active ingredient content, purity, and hygiene before packaging.

3.4 Extract Quality Standards and Applications

High-quality Cistanche extract features:

Qualified active ingredient content (e.g., total phenylethanoid glycosides ≥ 5%);

High purity, no impurities;

Qualified hygiene and stability.

Applications:

Pharmaceutical preparations (capsules, tablets);

Health products (oral liquids, soft capsules);

Cosmetics (essences, masks).

Value is greatly enhanced compared with dried products.

Cistanche tubulosa extract

Whole-Process Quality Control and Industrial Significance

A full-process quality control system is established from fresh harvesting to primary processing, drying, extraction, purification, finished product testing, packaging, and storage to ensure safety and quality.

Cistanche processing industry elevates the value of this "desert treasure" from low-cost fresh herb to high-value-added extract, boosts economic development in desert areas, promotes desert control, and achieves a win-win situation for ecological protection and economic growth, supporting rural revitalization and ecological civilization. With continuous innovation in processing technology, the medicinal and economic value of Cistanche will be further unleashed.