Cellulose Staining Solution (Zinc Chloride-Iodine Method)

Guidelines (The following is our recommended protocol, which serves only as a guide and should be modified according to your specific needs).
(I) Staining of Plant Fibers: Visualization of Cellulose in Flax and Bast Fibers
1. Suitable materials: Bast fibers such as flax, hemp, jute, ramie (including raw fibers, dewaxed fibers, and depectinated fibers).
2. Place a small amount of fiber sample on a glass slide, and add a drop of water to spread the fibers.
3. Add this product (Zinc Chloride-Iodine Staining Solution) to completely cover the fibers.
4. Apply a coverslip and observe under a light microscope.
5. Cellulosic cell walls stain blue-purple, and transverse markings/fissures on the fiber surface become more distinct due to dye accumulation.
6. Observation can be combined with a polarizing microscope: Birefringent regions of cellulose appear bright under crossed polarizers and gradually darken as the staining reaction proceeds.
7. Staining results: Cellulosic cell walls show blue-purple color; pectinaceous intercellular substances are unstained (counterstaining with ruthenium red can be used for comparison).
(II) Staining of Algal Cell Walls: Histochemical Identification of Cellulose
1. Suitable materials: Cross-sections or surface views of thalli from green algae (e.g., Prasiola japonica).
2. Place the algal tissue section or whole-mount specimen on a glass slide.
3. Add this product to cover the specimen and stain for several minutes.
4. Observe the staining reaction of each cell wall layer under a microscope.
5. Staining results:
Innermost cell wall layer (Layer C, cellulose layer) → Dark blue
Outer cell wall layer (Layer B, mannan layer) → Unstained
Middle lamella (Layer D, acidic polysaccharide layer) → Unstained (stains deep red with ruthenium red)
6. Verification experiments (optional):
(1) After alkali treatment: After treatment with 4% NaOH at 90°C for 10 min, Layer C still stains dark blue with this product (cellulose is alkali-resistant).
(2) After cellulase treatment: After digestion with Trichoderma cellulase at 30°C for 20 h, Layer C disappears and no longer stains with this product (confirming it is cellulose).
(III) Staining of Archaeologically Mineralized Textile Fibers: Differentiation of Cellulose / Lignin
1. Suitable materials: Archaeologically mineralized textile fibers (residues of plant or animal fibers mineralized by iron/copper alloy corrosion).
2. Demineralization pretreatment: Take approximately 1 mm³ of fiber sample, heat gently with 2.5% dilute hydrochloric acid at about 40°C to dissolve metal salt corrosion products, avoiding acid hydrolysis of cellulose.
3. Blot away the acid solution and metal salts with a small piece of filter paper, add a small amount of water for washing, and blot dry again.
4. Place the treated fiber fragments on a glass slide, and add this product to cover the sample.
5. Do not rinse after staining (staining of degraded samples is not durable, and rinsing will cause decolorization); apply a coverslip directly.
6. Observe under a transmission polarizing microscope, and rotate the stage to change the angle between the fiber axis and the polarization plane.


Cellulose Staining Solution (Zinc Chloride-Iodine Method) (3 min) specifically and sensitively stains modern and mineralized archaeological plant fibers magenta/purple; its staining color changes with polarization state, which can verify the authenticity of staining, and no false-positive results occur on protein-based fibers^[1].
Cellulose Staining Solution (Zinc Chloride-Iodine Method) clearly stains the transverse striations of separated flax fiber cells at ×10² magnification^[2].
Cellulose Staining Solution (Zinc Chloride-Iodine Method) highlights transverse surface markers of bast fiber cells in flax, hemp, jute and ramie, among which flax, hemp and some ramie fibers exhibit an "X"-shaped marker that is absent in jute^[2].
Cellulose Staining Solution (Zinc Chloride-Iodine Method) stains the innermost C layer of the cell wall of Prasiola japonica as well as the isolated polysaccharide C (cellulose) dark blue, confirming that the C layer is composed of cellulose^[3].
Cellulose Staining Solution (Zinc Chloride-Iodine Method) (1-22 wt.%; 10 min) can successfully detect and distinguish the presence and relative content of cellulose deposited on PET fabric samples, with deeper staining indicating a higher amount of added cellulose^[4].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.