Marcha: The Probiotic Amylolytic Starter of Sikkim, Darjeeling, Nepal, Bhutan & Tibet

Marcha, also known as murcha, is a traditional amylolytic starter culture used extensively across the Eastern Himalayan regions including Sikkim, Darjeeling Hills, Nepal, Bhutan, and Tibet . Unlike the herb dominated starters of Assam or the barley based Phab of Himachal Pradesh, Marcha is a glutinous rice based starter that contains a complex consortia of amylolytic and alcohol producing yeasts, filamentous molds, and lactic acid bacteria, preserved in the form of dry, flattened, or round balls . This remarkable microbial ecosystem enables the fermentation of cereals into mild alcoholic beverages such as jaanr, jand, and raksi, representing a unique technology of microorganism preservation developed in Asia .

Cultural Roots and Nomenclature

Marcha is the Nepali word for this starter culture, but different ethnic communities of the region call it by their own dialects. The Limboo people refer to it as Khesung, the Tamang as Bharama, the Rai as Bopkha or Khabed, the Bhutia and Tibetans as Phab, and the Lepcha as Buth or Thanbum . This linguistic diversity reflects the deep integration of fermented beverages across Himalayan cultures.

Traditional Significance

Marcha is traditionally produced at home exclusively by women, and this art is practiced as a hereditary trade that passes from mother to daughters . The knowledge of plant collection and starter preparation is held by elder women, who venture into nearby forests, grasslands, and riversides to gather the required plant species . The production of Marcha is not merely a culinary practice but a cultural heritage that has sustained Himalayan communities for generations, enabling them to produce alcoholic beverages that are integral to festivals, ceremonies, and daily life.

The Microbiology: A Symbiotic Consortium

Marcha contains a remarkable diversity of microorganisms working in synergy. Unlike commercial brewing yeasts that only perform alcoholic fermentation, the Marcha consortium includes three functional groups that work in sequence.

Filamentous Molds

The mold component includes species such as Mucor circinelloides and Rhizopus chinensis . These molds produce amylase enzymes that break down the complex starches in rice into simple, fermentable sugars. This process is called saccharification and is essential because yeasts cannot directly ferment starches.

Amylolytic Yeasts

These yeasts simultaneously produce enzymes to break down starches and ferment the resulting sugars. The key amylolytic yeast species identified in Marcha include Saccharomycopsis fibuligera and Saccharomycopsis capsularis . These yeasts have high amylolytic activity and are believed to play a predominant role in the starch based fermentation.

Ethanol Producing Yeasts

Several yeast species convert sugars into ethanol and carbon dioxide. These include Saccharomyces bayanus, Candida glabrata, Pichia anomala (also known as Wickerhamomyces anomalus), and Pichia burtonii . A culture independent study using PCR DGGE revealed the dominance of Wickerhamomyces anomalus at 72 percent and Pichia anomala at 28 percent in Marcha samples, establishing these as the primary yeast species in the starter .

Lactic Acid Bacteria (LAB)

The bacterial component of Marcha includes several LAB species that contribute to the probiotic profile. Research has isolated and characterized LAB strains from Marcha and related dry starters including Pediococcus pentosaceus, Enterococcus durans, Enterococcus faecium, and Pediococcus acidilactici .

Yeast Diversity Documented in Marcha

Scientific studies using both culture dependent and culture independent methods have identified a wide range of yeast genera in Marcha :

· Saccharomyces (including S. bayanus)

· Pichia (including P. anomala and P. burtonii)

· Wickerhamomyces (W. anomalus, reported for the first time from Marcha)

· Candida (including C. glabrata)

· Saccharomycopsis (including S. fibuligera and S. capsularis)

· Kluyveromyces

· Torulospora

· Schizosaccharomyces

· Issatchenkia

· Debaryomyces

· Hansenula

· Zygosaccharomyces

Viable Cell Counts in Marcha

The yeast load in Marcha is substantial. Research has documented yeast counts ranging from 3.5 × 10⁶ to 3.2 × 10⁹ colony forming units per cubic centimeter of Marcha sample . An average load of 6.0 × 10⁸ CFU per gram has been reported, indicating that Marcha is an extremely dense source of live yeasts . The filamentous molds are typically recovered at lower counts, less than 10⁴ CFU per sample .

Lactic Acid Bacteria in Marcha

While yeasts numerically dominate Marcha, the LAB component is functionally significant. Research on dry starters of the Eastern Himalayas including Marcha has isolated 37 LAB strains and characterized their probiotic properties .

Identified LAB Species in Marcha and Related Starters

· Pediococcus pentosaceus

· Enterococcus durans

· Enterococcus faecium

· Pediococcus acidilactici

Probiotic Properties of Marcha LAB

Research has demonstrated that LAB isolated from Marcha possess several probiotic characteristics essential for gastrointestinal survival and health benefits :

Acid and Bile Tolerance

Approximately 38 percent of the LAB strains showed a high survival rate exceeding 50 percent at pH 3 and in the presence of 0.3 percent bile salts. This indicates their ability to survive the harsh acidic conditions of the stomach and the bile salts in the small intestine.

Hydrophobicity and Adhesion

Enterococcus durans strains showed the highest hydrophobicity percentage at 98 percent, indicating strong potential for adhesion to the intestinal wall. Multiple adhesion genes including apf, mub1, and mapA were detected in various strains, providing the genetic basis for gut colonization.

Cholesterol Assimilation

Enterococcus durans DMB4 and SMB7 showed maximum cholesterol assimilation activity, suggesting potential for managing hypercholesterolemia.

Ethanol Tolerance

Approximately 86 percent of LAB strains showed optimal tolerance to 10 percent ethanol concentration, which is essential for survival in the alcoholic environment of fermented beverages.

Enzyme Production

The majority of strains showed phytase activity, which enhances mineral bioavailability by breaking down phytic acid. About 65 percent of the LAB strains showed the ability to produce β galactosidase, the enzyme that breaks down lactose. Notably, none of the strains showed amylase activity, confirming that starch degradation in Marcha is primarily carried out by the mold and yeast components.

Probiotic and Functional Marker Genes

Genetic screening of LAB from Marcha and related starters has revealed the presence of several important genes :

Survival Genes

The clpL gene and aguA gene, associated with survival in gastrointestinal tract conditions, were detected with high frequency.

Bile Salt Tolerance Gene

The bsh gene was detected in Pediococcus pentosaceus SMB13 1 and Enterococcus faecium BPB11.

Bacteriocin Production Gene

The pedB gene for pediocin, a antimicrobial peptide, was detected in Enterococcus durans DMB13 and Pediococcus acidilactici AKB3, indicating the ability to produce natural antimicrobials against foodborne pathogens.

Nutritional Marker Genes

The ribA and folP genes, showing potential ability to synthesize riboflavin (vitamin B2) and folic acid, were detected in some strains. This suggests that Marcha fermented beverages may have enhanced B vitamin content.

The Probiotic Potential of Lactobacillus plantarum DM5

A specific isolate, Lactobacillus plantarum DM5, was obtained from Marcha and extensively characterized for probiotic properties . This strain demonstrated:

· Survival at low acidic pH 2.5 for 5 hours

· Decrease in viable cell population of only 7 percent in artificial gastric juice and 13 percent in intestinal fluid

· Enhanced growth in the presence of lysozyme (200 µg/ml) and bile salt (0.5 percent)

· Ability to deconjugate taurodeoxycholic acid, indicating potential to reduce hypercholesterolemia

· Cell surface hydrophobicity of 53 percent and autoaggregation of 54 percent

· Bacteriocin activity of 6400 AU per milliliter, inhibiting foodborne pathogens including Escherichia coli, Staphylococcus aureus, and Alcaligenes faecalis

These properties establish L. plantarum DM5 as a prospective probiotic and starter culture for food industry applications.

The Herbal Component of Marcha

Marcha is distinguished from commercial starters by the inclusion of numerous medicinal plants. The specific plant species used vary by region and community tradition, but several core ingredients are consistently documented .

Core Herbal Ingredients in Marcha

Plumbago zeylanica (roots)

Known as Chitu in Magar, this plant is a consistent ingredient across Marcha preparations. It has documented medicinal properties and is believed to contribute to the starter antimicrobial activity.

Buddleja asiatica (leaves)

This plant provides leaves that are dried and powdered before incorporation into the starter mixture.

Vernonia cinerea (flowers)

The flowers of this species are included in the Marcha formulation.

Zingiber officinale (ginger)

Fresh ginger is added at approximately 5.0 grams per kilogram of rice, contributing both flavor and antimicrobial compounds that may help shape the microbial community.

Red dry chili (Capsicum species)

A small amount of red dry chili is added, contributing capsaicin and other bioactive compounds.

Previously prepared Marcha (mother culture)

Approximately 10.0 grams per kilogram of rice, or about 1 percent, of previously prepared Marcha is added as an inoculum for back sloping fermentation . This practice ensures consistency between batches and represents an unbroken chain of microbial propagation.

Additional Plant Species Used in Nepal

Research in the Sunsari district of Nepal documented several additional plant species used in Marcha preparation, with specific plants chosen for imparting different flavors and for their intoxicating properties :

Artocarpus heterophyllus (leaves and tender shoots)

Blumea lacera (whole plant)

Clematis buchananiana (whole plant)

Conyza japonica (inflorescence)

Drymaria diandra (whole plant)

Eupatorium adenophorum (whole plant)

Natsiatum herpeicum (whole plant)

Piper mullesua (young leaves)

Scoparia dulcis (whole plant)

The plant parts are collected from nearby forests, grasslands, wastelands, croplands, roadsides, and riversides during the off season . They are washed with spring water, spread on straw mats, and left to dry in the shade for several days before being powdered and incorporated into the starter mixture.

The Peak Stage of Probiotic Diversity

The stage when probiotic diversity as well as count is at its highest within Marcha is at the conclusion of the initial fermentation period, after the dough has been incubated for 1 to 3 days, before the cakes are sun dried . At this point, the microbial community has fully proliferated in the warm, moist environment of the incubating cakes. The yeasts have reached their maximum density, with counts documented up to 10⁹ CFU per gram. The LAB population is also at its peak, with the full diversity of species present and active.

During the subsequent sun drying for 2 to 3 days, the moisture content drops from approximately 40 to 50 percent to below 10 percent. This desiccation puts the microbes into a state of dormancy, significantly reducing metabolic activity but not killing them. The dried Marcha cakes can be stored for more than a year at room temperature in a dry place, with the microbes remaining viable and reactivating when rehydrated in cooked grain .

Preparation Guidelines for Marcha

The traditional preparation of Marcha follows a careful, multi step process documented by researchers across the Eastern Himalayas. The following recipe is based on traditional methods .

Raw Materials for Approximately 1 Kilogram of Marcha Cakes

Glutinous rice (Oryza sativa)

Quantity: 1 kilogram. The rice is soaked in water for 6 to 8 hours before use .

Plumbago zeylanica (roots)

Quantity: 2.5 grams, dried and powdered.

Buddleja asiatica (leaves)

Quantity: 1.2 grams, dried and powdered.

Vernonia cinerea (flowers)

Quantity: 1.2 grams, dried and powdered.

Fresh ginger (Zingiber officinale)

Quantity: 5.0 grams, finely grated or pounded.

Red dry chili (Capsicum species)

Quantity: 1.2 grams, powdered.

Previously prepared Marcha (mother culture)

Quantity: 10.0 grams, powdered. This serves as the inoculum for the new batch .

Filtered non chlorinated water

Quantity: As needed to form a dough.

Optional additional herbs

As available and according to local tradition.

Equipment

Wooden mortar and pestle (okhil and musli)

Traditionally made from specific woods such as khamari (Gmelina arborea) for the mortar and rajbriksha (Cassia fistula) for the pestle .

Foot driven wooden thresher (dhiki)

Used for grinding the soaked rice into flour .

Bamboo platform (nanglo)

Used for drying and incubating the cakes .

Fresh fern fronds (Glaphylopteriologsis erubescens)

Used as bedding and covering for the fermenting cakes .

Jute bags

Used for covering the cakes during fermentation .

Step by Step Recipe

1. Soak the rice

Wash the glutinous rice thoroughly. Soak the rice in clean water for 6 to 8 hours at ambient temperature .

2. Partially dry the soaked rice

After soaking, drain the water and spread the rice on a clean surface. Allow it to semi dry in the sun for a short period .

3. Grind the rice

Transfer the semi dried rice to a foot driven wooden thresher (dhiki). Operate the dhiki by exerting pressure with the leg and foot to pound the grains. Collect the ground powder, sieve it through a bamboo sieve (chaini) to obtain fine flour. Return coarse particles to the dhiki for further grinding .

4. Prepare the herbal powder

Collect the required plant parts. Wash them with spring water and spread them on straw mats to dry in the shade for several days. Once completely dry, place the dried plant parts in a wooden mortar (okhil) and pound them manually with a wooden pestle (musli) until they attain a greenish powdery texture .

5. Combine ingredients

In a large wooden bowl (ari), combine the rice flour, powdered herbal mixture, grated ginger, powdered red chili, and powdered previously prepared Marcha (mother culture). Mix thoroughly.

6. Add water and form dough

Add spring water gradually to the dry mixture, working it manually into a stiff, pliable dough. The dough should be firm enough to hold its shape when formed into cakes .

7. Shape the cakes

Pinch off portions of the dough and shape them into small circular cakes approximately 4 to 6 cm in diameter and 0.8 to 1 cm in thickness. Press the dough firmly in the palms of the hands to form compact, smooth cakes .

8. Spray with old Marcha powder (optional)

Some traditions spray additional powder from previously prepared Marcha onto the surface of the fresh cakes to ensure adequate inoculation .

9. Prepare the incubation bed

Place fresh fronds of the fern Glaphylopteriologsis erubescens on a bamboo platform (nanglo) suspended below the ceiling above the earthen kitchen. The traditional practice positions the platform approximately 2.5 meters above the fireplace to utilize the warmth .

10. Incubate the cakes

Arrange the Marcha cakes individually on the bed of fern fronds. Cover them with additional fresh fern fronds and jute bags. Leave the cakes to ferment for 1 to 3 days . The fermentation duration varies with season, proceeding faster during summer months . Completion of fermentation is indicated by a distinct alcoholic and ester aroma, and the cakes may appear puffy or swollen.

11. Dry the cakes

After fermentation, transfer the cakes to a bamboo mat or nanglo. Sun dry the cakes for 2 to 3 days until they are completely hard and dry . In regions with high humidity or during rainy weather, the cakes may be dried over a traditional fireplace, with the nanglo placed on wooden planks about 2.5 meters above the fireplace to facilitate faster drying .

12. Store the finished Marcha

Collect the dried, hard cakes in a shallow semi conical bamboo basket (dalo). Store them in a dry place at room temperature. Properly dried Marcha can be stored for more than a year . In Nepal, it is typically stored for about a month before use . The cakes can be used as and when required for brewing.

Signs of Success

A properly made Marcha cake is hard and dry with a color ranging from creamy white to dusty white, sometimes with a greenish mosaic tinge . It has a pleasant, complex aroma with notes of fermentation, herbs, and a faint alcoholic ester character. The cake should be free from any black, green, or blue mold. When broken open, the interior should be dry and uniform. The diameter typically ranges from 1.9 cm to 11.8 cm, and the weight from 2.3 g to 21.2 g depending on the size of the cakes .

Troubleshooting Common Issues

Cakes develop black or green mold

Cause: Contamination by undesirable fungi due to insufficient drying, too much humidity during incubation, or unclean equipment. Solution: Discard all contaminated cakes. Ensure the incubation area has good air circulation and that the fern fronds are fresh. Sterilize all equipment before use.

No fermentation activity (no aroma development)

Cause: Temperature too low for fermentation, or the mother culture used was not viable. Solution: Move the incubating cakes to a warmer location. Ensure the previously prepared Marcha used as inoculum is from a successful batch and has been properly stored.

Cakes crack or crumble during drying

Cause: Dough too dry or insufficient kneading. Solution: Add slightly more water to the dough in the next batch and knead more thoroughly to develop a cohesive structure.

Cakes have a rancid or ammonia like smell

Cause: Overgrowth of undesirable bacteria during the fermentation period. Solution: Discard the batch. Ensure the fermentation duration does not exceed 3 days and that the cakes are dried immediately after fermentation.

Storage and Shelf Life

Properly dried Marcha stored in a dry place at room temperature in a bamboo basket or airtight container will maintain its viability for more than a year . The cakes are sensitive to moisture; once they absorb humidity, they can mold or lose their fermenting power. In Nepal, Marcha is typically used within about a month of preparation . Do not refrigerate the dried cakes, as condensation can introduce moisture and cause mold growth.

Beverages Made Using Marcha

Marcha is used as the starter culture for several traditional fermented beverages :

Jaanr

A sweet sour alcoholic drink produced in Sikkim and Darjeeling Hills by fermenting cooked rice or millet with Marcha.

Jand

A local beer with low alcohol concentration produced in Nepal.

Raksi

A distilled liquor with higher alcohol concentration produced in Nepal by further processing jand.

Chhaang

The Himalayan millet beer of Sikkim and Tibet, produced using Marcha or related starters.

Usage Note

Marcha is a starter culture and is not meant to be consumed directly. It is used as an inoculum to ferment cooked cereals into alcoholic beverages. To use, powder a Marcha cake and mix it into cooled, cooked rice or millet. The microbes in the cake will reactivate and ferment the grain over 2 to 3 days.

Individuals with mold allergies should avoid handling Marcha, as the starter contains spores of various fungi, including Aspergillus and Rhizopus species. Always wash hands thoroughly after handling Marcha cakes. The final fermented beverages contain alcohol and live yeasts and bacteria; pregnant women, individuals with compromised immune systems, or those with histamine intolerance should exercise caution.

The knowledge of Marcha preparation is a traditional heritage that should be respected. If you are fortunate enough to receive instruction from a traditional practitioner, honor their knowledge and the plants they use.

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