home *** CD-ROM | disk | FTP | other *** search
- Date: Mon, 1 Aug 94 19:07:22 EDT
- From: andy@eng.tridom.com (Andrew P. Klenzak)
-
- Last week (Jul 27 1994) litch@bga.com (R. Michael Litchfield) wrote:
- >In article <CtK2xB.6oo@tridom.com>,
- >Andrew P. Klenzak <andy@eng.tridom.com> wrote:
- >>The leaves of a Cannabis plant can be nearly as potent as the growing
- >>shoots and/or buds.
- >
- >Not really, there is a trace amount of THC in the leaves but 95% of the THC
- >is in the bud and the leafnode immediatly down from it. There was a study
- >this done by the university of Illinois I believe (do a keyword search
- >on the ag abstracts to find it).
- >
- >>Andy
- >
- >-michael
-
- I'd be interested in the specifics of that study you remember reading
- about, as well as a full reference citation. I looked into it and
- came across one article/paper that dealt with the potency of the
- various parts of the Cannabis plant. I didn't/don't have access
- to medline, so I wasn't able to that thorough of a search.
-
- The following is from _The cannabinoid content of Cannabis sativa L.
- grown in England_ by Fairbairn and Liebmann in the Journal of Pharmacy
- and Pharmacology, vol 26 (Dec. 1974), pp. 413-419. This work is
- cited in at least two growing books I know of.
-
- The leaves referred to by the chart are "healthy leaves from plants at
- vegetative or flowering stages and which were not closely associated
- with a floral axis." They are *not* vegetative tops (growing shoots)
- or flowering tops (buds), as those are two separate, distinct
- catagories that the researchers differentiate.
-
- Table 3.
- THC content (% of air dried material) and air-dry weight of leaves
- collected simultaneously at different positions on the plant.
-
- plant 1 plant 2 plant 3
- Position on plant (SP5) (SP5) (UNC 335)
- ~~~~~~~~~~~~~~~~~ ~~~~~~~ ~~~~~~~ ~~~~~~~~
- TOP % THC 6.1 6.9 4.8
- dry wt (mg) 35 21 28
- MIDDLE % THC 3.0 5.5 3.1
- dry wt (mg) 119 74 70
- BOTTOM % THC 0.8 4.0 1.5
- dry wt (mg) 314 133 133
-
- [top:mid:bot ratios 8:4:1 1.7:1.4:1 3:2:1
-
- The article also discusses (and shows) the large variability between
- plants of the same variety -- Table 2 shows how one plant (UNC 255)
- can have 3 times the %THC as another of the same variety. It also
- notes that most plants (not all) will tend to have high ratios when
- comparing the potency from the top to the bottom. But as plant 2
- of the SP5 variety shows, it can be nearly uniform.
-
- Now, given that one can easily get high on 1% THC material (be it
- buds or leaves), it would seem to make sense to keep/smoke/extract
- the leaves. Hell, the topmost leaves examined in this study have
- a greater % THC than a great deal of "ditchweed" out there!
-
- Now, you'd thought that 95% of the THC was in the buds. This
- *may* actually be true -- it all depends on the total weight of
- the buds compared to that of the leaves. If you get 10 oz. of (dried)
- buds from a plant and 0.5 oz. of dried leaves, then yes, 95% of the
- THC may be in the buds, but that 5% in the leaves is *still* very
- adequate to get you high.
-
- Sure, only the topmost leaves on some plants will be worth your while.
- The point is you should always test some of the leaves to see how
- potent they are -- throwing away material with >= 3% THC is ludicrous!
-
- Andy
-
-
- From: DrewH37597@aol.com
- Message-Id: <9408092314.tn875436@aol.com>
- To: drctalk-l@netcom.com
- Date: Tue, 09 Aug 94 23:14:50 EDT
- Subject: NIDA Potency Tables, Marijuana
-
- Marijuana Potency Monitoring Project, Report #50
- April 1, 1994 through June 30, 1994
-
- Page 3, Table 1.
- Normalized Versus non-normalized Cannabinoid
- Averages of Illicit Cannabis Samples by Year Seized
-
- NORMALIZED
- Year Seizures THC CBD CBC CBN Kilograms
- # % % % % Total
- (rounded)
- 1974 113 0.36 0.00 0.08 0.44 18013
- 1975 150 0.48 0.00 0.09 1.17 67160
- 1976 210 0.98 0.00 0.12 0.62 101192
- 1977 251 1.76 0.00 0.10 0.74 173612
- 1978 132 1.72 0.01 0.12 1.27 154533
- 1979 221 1.53 0.02 0.12 1.40 71860
- 1980 153 1.96 0.01 0.16 0.69 44095
- 1981 260 2.11 0.02 0.18 0.98 147440
- 1982 487 3.34 0.11 0.17 0.74 299892
- 1983 1229 3.44 0.02 0.16 0.54 776566
- 1984 1119 3.96 0.07 0.13 0.47 1259065
- 1985 1653 2.63 0.14 0.09 0.52 729213
- 1986 1554 2.24 0.06 0.11 0.44 669472
- 1987 1699 2.23 0.23 0.11 0.33 621069
- 1988 1822 3.84 0.18 0.14 0.54 352194
- 1989 1272 2.66 0.20 0.16 0.60 179103
- 1990 1260 3.83 0.11 0.18 0.37 52987
- 1991 2505 3.78 0.17 0.17 0.27 76278
- 1992 3539 1.96 1.21 0.09 0.23 698443
- 1993 3229 3.89 0.41 0.16 0.32 378383
- 1994* 343* 4.57 0.23 0.23 0.54 44461*
- * Through June 30
-
- NON- NORMALIZED
- Year THC CBD CBC CBN
- % % % %
- 1974 0.89 0.03 0.08 0.49
- 1975 0.71 0.03 0.10 0.55
- 1976 0.72 0.00 0.09 0.37
- 1977 0.91 0.08 0.10 0.43
- 1978 1.37 0.01 0.12 0.67
- 1979 1.67 0.02 0.12 0.24
- 1980 2.06 0.10 0.14 0.47
- 1981 2.28 0.35 0.16 0.38
- 1982 3.05 0.34 0.19 0.33
- 1983 3.23 0.22 0.16 0.30
- 1984 3.29 0.24 0.17 0.34
- 1985 2.82 0.28 0.14 0.23
- 1986 2.30 0.29 0.15 0.21
- 1987 2.93 0.30 0.17 0.30
- 1988 3.29 0.28 0.15 0.30
- 1989 3.06 0.37 0.14 0.22
- 1990 3.36 0.38 0.18 0.19
- 1991 3.00 0.45 0.19 0.16
- 1992 3.10 0.24 0.20 0.36
- 1993 3.32 0.39 0.19 0.28
- 1994* 4.45 0.40 0.21 0.33
- Through June 30, 1994
-
-
- These are the main tables, more to follow. NIDA took about two months give
- or take to respond to my request...
-
- Drew
-