It is observed that the red sanders grown on the shale type of subsoil, at an altitude of 750 meters above mean sea level and in semi-arid climatic conditions gives a distinctive wavy grain margin and the wood pieces with the wavy grain margin are graded as "A" grade. Red sanders with wavy grain margin fetch a higher price than the non-wavy wood.
The products and timber derived from the Red Sanders tree is highly priced and the price is increasing exponentially. Commercially, there are two types of Red Sanders trees- quality trees and non-quality trees. Quality trees have wavy grain structure in the wood whereas in a non-quality tree it is absent. Until a tree attains an age of 25 years, it would not be known whether the tree belongs to a quality tree or a non-quality tree category. The price determinant depends on this natural factor. Crocodile scaled bark is formed when the heartwood is completely matured.
The heartwood can accumulate various elements and rare earth elements like strontium cadmium, selenium, zinc, copper and uranium. Red Sanders wood has an important insoluble or sparingly soluble red wood dye. It contains 16% of the pigment santalin (santalic acid) a major colouring matter which was first isolated in a crude form in 1833. It is being used as a textile dye and has five colouring components ranging from violet to orange in colour but is popular for providing red colour (Gulrajani et al., 2002; Siva, 2003; Ferreira et al., 2004). In European medicine, the red dye is used as a colouring agent while the French furniture makers used it for dyeing, polishing and varnishing during 1660 to 1885 (New, 1981). In USA, it is approved as a food dye for alcoholic beverages and approved as a food dye within Europe and is classified as a spice extract rather than food colourant (Mulliken and Crofton, 2008). Pterostilbene a methyl ester of resveratrol (3,5-dimethoxy-4'-hydroxy-trans-stilbene) was first isolated from Red Sanders (Sheshadri, 1972) and has wide range of promising pharmacological properties (Schmidlin et al., 2008).
Arunakumar et al. (2011) have extensively reviewed the phytochemical and pharmacological uses of P. santalinus. An interesting study on biogeochemistry reveals that heartwood and leaf of Red Sanders have the ability for elemental association and accumulation of various elements including rare earth elements. The accumulation of various elements is higher in heartwood and the range of strontium accumulation varied from 750 to 3,500 ppm. Some of the other elements accumulated in the heartwood are cadmium (5 to 28 ppm),zinc (50 to 6,000 ppm), copper (105 to 1,025 ppm). Among the various rare earth elements studied, the heartwood and leaves contained an average concentration of 1.22 and 0.03 ppm of Uranium, respectively and the accumulation was higher in P. santalinus compared to P. marsupium and P. dalbergioides (Raju and Rao, 1998; Raju and Raju, 2000; Raju and Srinivasalu, 2008). Siddhiraju (2013) reported that as P. santalinus has a narrow geographic and geological distribution; it can be used as a stratigraphic guide to recognize a group within the Kadapah Super group.
Presently grading of Red sanders in India would prescribes the following general standards for the Red Sanders logs from commercial perspective:
· Logs to be dressed nearly up to heartwood
· Straight or nearly straight
· Minimum length of 75 Cms
· Top end girth of 36 cms or above.
The logs are further graded into A, B, C or Non-Grade according to the following characteristics.
A. A-Grade - Sound or nearly sound with few or no defects;
B. B Grade - Semi-sound A grade logs with more defects; A grade logs with bends and Logs sound or semi-sound with some defects;
C. C-Grade - Long and shallow wavy grain or straight grain; Logs sound or semi-sound with some or no defects; Un-sound but utilizable A-grade logs with many defects and Un-sound but utilizable B-grade logs with many defects; and
D. Non Grade - Unutilized logs of all grades.
Acoustic comparison of the logs is when hit by a small hammer produce sounds of varying acoustic quality depending on the grade which in turn depends on the quality and arrangement of wood fibers. The group of sounds starts with Grade A followed by B & C, in the accompanying sound clip. Observe the change in pitch and resonance from A to C.
TRADITIONAL MEDICINAL USES:
It is an astringent and a cooling agent and is used in several skincare preparations. It is used in the treatment of pimples, acne, wrinkles etc. It is also used internally in chronic bronchitis, gonorrhoea and gleet, chronic cystitis with benzoic and boric acids.
Much used as a perfume for different purposes. The wood is used for making fancy articles and is much carved. It has been used in Ayurvedic medicine as an anti-septic, wound healing agent and anti-acne treatment. It has been used in Ayurvedic medicine as an anti-septic, wound healing agent and anti-acne treatment. A paste of the wood is used as a cooling external application for inflammations and headache. A decoction of fruit is used as an astringent tonic in chronic dysentery.
The species is, also, heavily exploited for its medicinal use as a ‘cure’ of vision, skin problems, and inflammation, particularly of the forehead. The powder of Red Sanders wood is also topically used in treating hemorrhage and bleeding piles. Use of Red Sanders extract is known in the treatment of skin diseases, leprosy, ulcers and mental aberrations.
In India, apart from limited domestic use as timber, the heartwood of the plant is used in the treatment of diabetes; the anti-diabetic constituent is ‘pterostilbene’
RED SANDERS UNIQUNESS:
Chemical Compounds Identified
- The red wood yields a natural dye santalin.
- Ether, alkalis, and three other crystalline principles Santal, Pterocarpin, and Homopterocarpin, small quantity of tannin, probably kino-tannic acid, has also been found in the wood.
- Heart wood is known to possess isoflavone glucosidessavinin, calocedrin, triterpene, isoflavone glucosides, lignan viz., savinin and calocedrin and triterpene.
Economic importance
- The plant is renowned for its characteristic timber of exquisite colour, beauty and superlative technical qualities and ranks among finest luxury in Japan.
- The red wood yields a natural dye santalin, which is used in colouring pharmaceutical preparations and foodstuffs.
Modern Medicinal usage:
- A decoction of the fruit is used as an astringent tonic in chronic dysentery. An infusion of the wood is used in the control of diabetes.
- The wood of Red Sanders is considered astringent, tonic and diaphoretic.
- A paste of the wood is used to give cooling effect, applied externally for inflammations and head-ache.
- It is useful in bilious affections and skin diseases.
- The wood is bitter in taste with a flavour, anthelmintic, alexiteric useful in vomiting, thirst, eye diseases, cures diseases of the blood, vata, and kapha , mental aberrations and ulcers.
- The wood is in treating headache, skin diseases, fever, boils, scorpion sting and to improve sight.
- The wood and fruit is used in treating diaphoretics, bilious infections and chronic dysentery.
- Heart wood is known to possess isoflavone glucosidessavinin, calocedrin and triterpene.
- The lignin isolated from the heartwood is known to inhibit tumour necrosis factor, alpha production and T-cell proliferation.
- The heart wood contains isoflavone glucosides and two anti-tumour lignans, viz., savinin and calocedrin.· A triterpene is reported from the callus of stem cuttings.
- Ethanol extract of stem bark at 0.25 g/kg body weight was reported to possess anti-hyperglycaemic activity.
- The stem barks extract was shown to contain maximum activity against Enterobacter aerogenes, Alcaligenes faecalis, Escherichia coli, Pseudomonas aeruginosa, Proteus vulgaris, Bacillus cereus, Bacillus subtilis, and Staphylococcus aureus.
- The leaf extract showed maximum activity against Escherichia coli, Alcaligenes faecalis, Enterobacter aerogenes and Pseudomonas aeruginosa.
- The ethanol extracts of Pterocarpus santalinus L.f. (Fabaceae) at dose of 50-250 mg/kg showed gastroprotective effect in reserpine-induced, pyloric-ligated experimental rats.
Industrial Usage:
- Products of Red Sanders are considered for aphrodisiac usage in pharmaceuticals industries.
- Red sanders are believed to be used as a coolant in nuclear reactors, which is perhaps why the South East Asian nations are a preferred destination for the wood.
- Through biogeochemical research (Raju and Raju 2000), traces of uranium (1.22 ppm) and thorium (0.14 ppm) were observed in Red Sanders heartwood and leaves. Although this concentration is not very high, it is still indicative for expanding research avenues for alternative nuclear fuel sources.
CONSERVATION STATUS OF RED SANDER:
Pterocarpus santalinus was classified as endangered in the 1997 IUCN Red List of Threatened Plants. The Government of India considered both legal and illegal trade to threaten P. santalinus and proposed it for inclusion in CITES Appendix II, with its restricted distribution and slow rotational rate - increasing the level of threat. The species was included in CITES Appendix II in 1995.
Red Sanders (Pterocarpus santalinus) is listed under Appendix II of Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) allows trade in wild specimens only if NDF (Non Detrimental Findings) are given by a specific authority and if the CITES Management Authority certifies that export of the species would not cause depletion of the natural wild stock.
India is a signatory to the CITES convention and therefore trade of Red Sanders from the wild including seized/confiscated material was be allowed earlier as NDF by a scientific body for the species has not been conducted in India. However, India has done NDF study and share with CITES in 2012 and the trade ban was lifted by CITES.
The major threat to the existing population of Red Sanders is caused by illicit logging and smuggling of wood, due to its special demand as a high quality timber, which has a characteristic red colour. Illegal trade in Red Sanders involves a complex nexus of smugglers and individuals who are allegedly involved in other forms of criminal activities. In a recent investigation into its trade, Andhra Pradesh Police Department observed that the smugglers involved in trading Red Sanders from Seshachalam hills are also active in the surreptitious trade of narcotics and other crimes (Umashanker 2015).
LEGAL TRADE OF RED SANDERS:
In year 2012, the Ministry of Environment, Forests, and Climate Change (MoEFCC) submitted an NDF report to CITES and requested for a one-time permission to export confiscated wood logs. Apart from this demand, CITES also agreed to a request of permission from the Indian Government for exporting 310 metric tonnes of Red Sanders every year from private plantations in Tamil Nadu and Andhra Pradesh and 11806 MTs export quota as one time exemption was given for confiscated Red Sanders.
Red Sanders and EXIM Policy: Incorporating the provisions of CITES into India Laws as envisaged by the CITES Convention, under the FTDR (Foreign Trade Development and Regulation Act’ 1992), a notification No. 2(Re-98)/1997-2002 has been issued, which prohibits the export of plants, plant portions and their derivatives and extracts from the wild.
In year 2014, the Director General of Foreign Trade (DGFT) permitted the state of Andhra Pradesh to export 8584 metric tonnes of confiscated Red Sanders logs, out of which approximately 2715.91 metric tonnes was auctioned till date and the remaining logs were expected to be auctioned in October 2015 and 2016. Currently, under phase III, around 2868 metric tons are kept for auction. Pterocarpus santalinus is included in this notification of DGFT for exporting in log form subject to CITES as there is less domestic demand.
Existing quota of CITES as per website of CITES is Zero for all specimens from the wild with a Note: India will authorize the export of specimens of any type, from 310 metric tonnes of wood per year from artificially propagated source (Source "A") and a one-time export of specimens of any type, from 9,090.09 metric tonnes of wood from confiscated or seized source (Source "I").
A close look at the recent global auctions held in India for the sale of the red sanders statuses that 90% bidders are from China, Hong Kong or Japan and 90% of all the exports that took place from India till date has a destination of China and Hong Kong. Only rare cases are UAE and Germany were observed. Approximately 60 Days to 90 Days is required for processing the export of Red sanders from India to importing destination.