CN104897827B - Avoid the preparative fraction collector of sample loss - Google Patents
Avoid the preparative fraction collector of sample loss Download PDFInfo
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- CN104897827B CN104897827B CN201510335132.4A CN201510335132A CN104897827B CN 104897827 B CN104897827 B CN 104897827B CN 201510335132 A CN201510335132 A CN 201510335132A CN 104897827 B CN104897827 B CN 104897827B
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Abstract
The invention discloses a kind of preparative fraction collector avoiding sample loss, it includes: fixed support；Transfer arm assembly, transfer arm assembly is connected on fixed support；Collection device, collection device is arranged on transfer arm assembly, collection device includes collecting liquid buffer, water influent pipeline part and collecting part, the import of described water influent pipeline part is connected for exporting with the liquid medium of detached dowel, the outlet of water influent pipeline part is connected with the import collecting liquid buffer, the outlet collecting liquid buffer is connected with the import of collecting part, the outlet of collecting part is collected in container to corresponding for trickle medium, and collecting part is additionally provided with switch valve；Controlling parts, the control output end controlling parts is connected with the control signal input of transfer arm assembly, and the control output end controlling parts is also connected with the control signal input of switch valve.The present invention it can be avoided that when container is collected in switching fraction spill phenomenon, thus reduce the loss rate of sample.
Description
Technical field
The present invention relates to a kind of preparative fraction collector avoiding sample loss, target compound after chromatographic isolation
Collect.
Background technology
At present, fraction collector is the auxiliary device of chromatograph of liquid, mainly for the preparation of with enrichment pure component.Work as needs
When offer standard pure sample or do certain component is identified further, usually collect required in detached dowel exit with fraction collector
Component, the flowing removed in fraction the most i.e. obtains pure component.The signal that catcher can be flowed out by chromatographic peak, with manual or from
Dynamic control mode is cut.Current development trend is the automatization realizing sample introduction with fraction collection, so can carry out even
Continuous operation and separation repeatedly.
Fraction collector is generally divided into two classes, and the first kind is to collect container with general rectangular array, fraction dispensing head
It is disposed on two dimensional surface or on all three dimension scales, thus distributes the liquid to each selectively and collect container,
Realize the collection of different fractions.First kind catcher is collectively referred to as " X-Y catcher ".Equations of The Second Kind is to collect container to install
On annular rotary table, the rotating disk that fraction collector is typically installed by rotation and rotation installation and the knot of the arm with dispensing head
Incompatible operation is to realize the collection of fraction.Equations of The Second Kind catcher is collectively referred to as " turntable collectors ".
The fraction collector of the most that type, each is collected separately between container and all there is certain distance.Therefore, when
Fraction dispensing head is when a collection container switches to subsequent vessel, it is possible to spilling of distributed liquid occurs, especially
In the case of flowing phase liquid is substantially continuous.Additionally, the fraction collector on market generally requires whole receipts
Collection receptacle stand piles collection container, and whether chromatograph None-identified a certain collection container position is placed collection container, be only capable of leading to
Cross user manually intervene prevent fraction collector without collect container position carry out fraction collection, it is to avoid cause target chemical combination
Thing or flowing leak mutually.Meanwhile, according to the general operation needs of chromatographic isolation, the collection container rack of target compound is held
Need temporarily to preserve or turnover, during preserving or having enough to meet the need typically with the form of artificial/hand labeled or label come labelling and
Identify collection container rack and sample message, but the mode efficiency of this hand labeled is low and is susceptible to mistake.Therefore,
One is needed to be avoided that sample loss, effectively identify that collection container position and the convenient identification collection container rack of energy and sample are believed
The preparative fraction collector of breath.
Summary of the invention
The technical problem to be solved is the defect overcoming prior art, it is provided that a kind of preparation avoiding sample loss
Type fraction collector, it it can be avoided that when container is collected in switching fraction spill phenomenon, thus reduce the loss rate of sample.
In order to solve above-mentioned technical problem, the technical scheme is that a kind of preparative fraction avoiding sample loss is received
Storage, it includes:
Fixed support；
Transfer arm assembly, described transfer arm assembly is connected on fixed support；
Collection device, described collection device is arranged on transfer arm assembly, and described collection device includes collecting liquid buffer, feed liquor
Pipeline portions and collecting part, the import of described water influent pipeline part is connected for exporting with the liquid medium of detached dowel
Logical, the outlet of described water influent pipeline part is connected with the import collecting liquid buffer, the outlet of described collection liquid buffer
Import with collecting part is connected, and the outlet of collecting part is extremely collected in container for trickle medium,
It is additionally provided with switch valve in described collecting part；
Controlling parts, the control output end of described control parts is connected with the control signal input of transfer arm assembly, with
Will pass through and control parts and manually or automatically control the action of transfer arm assembly, the control output end of described control parts also with open
The control signal input closing valve is connected, in order to manually or automatically control the action of switch valve by controlling parts.
The present invention is the most to be solved be technical problem is that: effectively prevents the frequent starting of chromatogram pump and preferably avoids sample
The waste of product liquid, it is to avoid the preparative fraction collector of sample loss also includes waste-solution line, described water influent pipeline portion
Dividing and have multiple-way valve, water influent pipeline and drain pipe road, the outlet of water influent pipeline is connected with an import of multiple-way valve, goes out liquid
The import of pipeline is connected with an outlet of multiple-way valve, and the import of waste-solution line is connected with another outlet of multiple-way valve, goes out
The outlet of liquid pipeline is connected with the import collecting liquid buffer, the control signal input of described multiple-way valve and control parts
Control output end be connected, in order to by control component controls multiple-way valve action.
When flowing out further for making distillate more uniformly, it is difficult to make collection liquid buffer produces bigger liquid surface wave
Dynamic, the exit of described water influent pipeline part is provided with shower nozzle.
Rinse the inwall collecting liquid buffer further for the liquid stream enabling shower nozzle to spray, thus remove the possible shape of inwall
The sample crystallization become, described shower nozzle has funnelform spout.
Further for collection liquid buffer keeping suitable pressure so that distillate easily flows into and discharges, described
Collection liquid buffer on be provided with pressure compensation mouth.
Further, described transfer arm assembly has power source, the control output end of described control parts and the control of power source
Signal input part processed is connected, in order to by controlling component controls power source, thus control the action of transfer arm assembly.
Further, it is to avoid the preparative fraction collector of sample loss also includes collection container rack, on described collection container rack
It is provided with and collects container chassis or there is the collection container receptacle body of multiple collection container jack, collect container chassis or collection
Container receptacle body is used for placing described collection container.
Further provide a kind of concrete structure controlling parts to collect in collection container rack can be learnt easily and holding
The information of device, described control parts have master control borad and collection container rack panel, and described collection container rack panel is pacified
It is contained on described collection container rack, and this collection container rack panel is connected with the transmission of master control borad two-way signaling.
Further for can the position of automatic recognition collecting container, and reach to need not all pile at collection container rack
Collect container, can partly place the requirement collecting container, when effectively preventing without collecting container, collect the sample liquids caused
Wasting phenomenon, described collection container rack is additionally provided with collection container identification device, and collects container identification device
Corresponding with collecting container, in order to collect container identification device for gathering collection container chassis or collecting in container jack
Collecting container state information, the control output end of described collection container identification device is connected with the signal input part controlling parts
Connect, in order to control parts and control the action of transfer arm assembly according to the container state information of collecting received.
Further for showing the information such as current the collection model of container, sample message, duty, it is to avoid sample
The preparative fraction collector of product loss also includes display module, and described display module is connected with controlling parts.
Further for providing electric energy to collection container rack, it is to avoid the preparative fraction collector of sample loss also includes
There are power autonomous module and/or external power source interface.
After have employed technique scheme, the present invention has a following beneficial effect:
1, the present invention it can be avoided that when container is collected in switching fraction spill phenomenon, thus reduce the loss rate of sample:
Owing to the transfer arm of transfer arm assembly is during moving to another collection container from a collection container, can be through receiving
Interval region between collection container, in order to ensure to be overflowed by distillate, the outlet of collecting part is from a collection
Container moved to another interval time collecting container, and the outlet at bottom collecting liquid buffer to be closed by switch valve,
At this moment the distillate that water influent pipeline part is discharged can accumulate in collecting liquid buffer；When the transfer arm of transfer arm assembly complete by
Collection device is when a collection upper vessel portion moves to another collection upper vessel portion, and switch valve is opened, and makes collection liquid delay
Distillate in storage is discharged.
2, the present invention effectively prevent the frequent starting of chromatogram pump and preferably avoids the phenomenon of waste of sample liquids, liquid
Chromatography duty has two kinds of situations, fraction collection state and non-fraction collection state, when chromatograph of liquid is in non-
During fraction collection state, on multiple-way valve, water influent pipeline is connected with waste-solution line, and closes between water influent pipeline and drain pipe road
Path, in such detached dowel discharge distillate can flow out from waste-solution line；When chromatograph of liquid is in fraction collection shape
During state, the path between water influent pipeline and drain pipe road connected by multiple-way valve, and closes the path of water influent pipeline and waste-solution line,
The distillate so discharged in detached dowel can enter through collection liquid buffer and collect container, and the present invention is when collecting appearance from one
When device switches to next collection container, it is not necessary to stop chromatogram pump or the direct removal waste fluid of sample, thus effectively prevent chromatograph
The frequent starting of pump and the waste of sample liquids；
3, present invention achieves the position of automatic recognition collecting container, parameter and status information, it is not required that collection container rack
All pile, when effectively preventing without collecting container, collect the waste causing sample liquids；Keep in or turnover period collecting sample
Between can the information such as the user profile of convenient identification collection container rack and sample message.
Accompanying drawing explanation
Fig. 1 is the structural representation of the preparative fraction collector avoiding sample loss of the present invention；
Fig. 2 is the partial enlarged drawing in Fig. 1；
Fig. 3 is drain pipe road and the connection diagram of collection liquid buffer of the present invention.
Detailed description of the invention
It is clearly understood to make present disclosure be easier to, below according to specific embodiment and combine accompanying drawing,
The present invention is further detailed explanation.
As shown in Figures 1 to 3, a kind of preparative fraction collector avoiding sample loss, it includes:
Fixed support 1；
Transfer arm assembly 2, transfer arm assembly 2 is connected on fixed support 1；This transfer arm assembly 2 could be arranged to should
Fraction collector (also referred to as X-Y fraction collector) for grid type, it is also possible to be set to apply to the fraction of rotating disc type
On catcher, by arranging corresponding motion mode, i.e. can reach above-mentioned technique effect；
Collection device, described collection device is arranged on transfer arm assembly 2, and collection device includes collecting liquid buffer 17, feed liquor
Pipeline portions and collecting part 8, the import of water influent pipeline part is connected for exporting with the liquid medium of detached dowel,
Described water influent pipeline part outlet with collect liquid buffer 17 import be connected, collect liquid buffer 17 outlet and
The import of collecting part 8 is connected, and container 9 is extremely collected in the outlet of collecting part 8 for trickle medium
In, collecting part 8 is additionally provided with switch valve 7；Control parts, control control output end and the transfer arm of parts
The control signal input of assembly 2 is connected, in order to manually or automatically control the dynamic of transfer arm assembly 2 by controlling parts
Making, the control output end of described control parts is also connected with the control signal input of switch valve 7, in order to by controlling
Parts manually or automatically control the action of switch valve 7, thus open or close the path of collecting part 8.
As shown in Figure 1, it is to avoid the preparative fraction collector of sample loss also includes waste-solution line 5, water influent pipeline part
Having multiple-way valve 4, water influent pipeline 3 and drain pipe road 28, the outlet of water influent pipeline 3 is connected with an import of multiple-way valve 4
Logical, the import on drain pipe road 28 is connected with an outlet of multiple-way valve 4, the import of waste-solution line 5 and multiple-way valve 4
Another outlet is connected, and the outlet on drain pipe road 28 is connected with the import collecting liquid buffer 17, the control of multiple-way valve 4
Signal input part processed is connected with the control output end controlling parts, in order to by controlling the action of component controls multiple-way valve 4,
Action control is as follows: make multiple-way valve 4 connect water influent pipeline 3 and drain pipe road 28 by controlling component controls multiple-way valve 4
Between path and close the path between water influent pipeline 3 and waste-solution line 5, or make multiple-way valve 4 connect feed liquor
The path between path and closedown water influent pipeline 3 and drain pipe road 28 between pipeline 3 and waste-solution line 5.
As it is shown in figure 1, the exit of water influent pipeline part is provided with shower nozzle 18, shower nozzle 18 has funnelform spout.
It is provided with pressure compensation mouth 6 as it is shown on figure 3, collect on liquid buffer 17, typically can use and collect liquid caching
Device 17 top is offered an evacuated tube and is reached this purpose, it is also possible to realized by pressurization, evacuator.
Transfer arm assembly 2 has power source, and the control output end controlling parts is connected with the control signal input of power source
Connect, in order to by controlling component controls power source, thus control the action of transfer arm assembly 2.
Due in actual use, the size collecting container 9 of employing or structure can be otherwise varied, and collect appearance
The structure of device frame 20, collect putting in order etc. of container 9 and also have difference, therefore, if it is desirable to allow this device can
Realize the fraction collection of more automatization, widen range of application, as shown in Figure 1, it is to avoid the preparative fraction of sample loss is received
Storage also includes collection container rack 20, collection container rack 20 is provided with collection container chassis or has multiple collection container
The collection container receptacle body of jack 11, collects container chassis or collection container receptacle body is used for placing described collection container 9.
Controlling parts and have master control borad 22 and collection container rack panel, described collection container rack panel is arranged on described
Collection container rack 20 on, and the transmission of this collection container rack panel and master control borad 22 two-way signaling is connected.Collect and hold
It is additionally provided with collection container identification device 14 on device frame 20, and it is relative with collecting container 9 to collect container identification device 14
Should, in order to collect container identification device 14 and collect container chassis for gathering or collect the collection container in container jack 11
Status information, the control output end of described collection container identification device 14 is connected with the signal input part controlling parts,
To control parts to control the action of transfer arm assembly 2 according to the container state information of collecting received.Collect container identification
The effect of device 14 is for whether sensing is placed with collection container in collecting container jack 11 or in collecting container chassis
9, and collection container state information is transferred to control parts, control parts to transfer arm assembly 2, multiple-way valve 4, open
When pass valve 7 is controlled, suitable adjustment can be carried out according to the situation collecting container 9 placement, such as, when collecting container
When not being placed with collection container 9 in jack 11, the transfer arm of transfer arm assembly 2 can be avoided not placing collection container 9 automatically
Region.Collecting container identification device 14 can be the identification device triggering based on contact or cordless or sensing,
Such as thin film switch, by compressing switch, the one of action response switch etc..Collection container rack 20 is by collection container rack body 10
And/or collection container rack base 13 forms.It addition, collection container rack panel can also comprise the function of outside input,
I.e. user inputs the information such as the collection model of container 9, size on collection container rack panel, and these information are sent to main
Control plate 22, so, controls parts and just can adjust the frequency collecting container switching according to the volume collecting container 9, i.e.
Collecting residence time above container 9 so that in collecting container 9, add the fraction of suitable volumes.
As shown in Figure 1, it is to avoid the preparative fraction collector of sample loss also includes display module 12, described display mould
Block 12 is connected with controlling parts, in order to information of container, fraction information, sample message etc. are collected in display module 12 display.
Display module 12 may be mounted on collection container rack 20.
Wherein, the master control borad 22 controlling parts can be internally-arranged type, it is also possible to being externally positioned type, externally positioned type is for example liquid
The master control borad 22 of chromatography, built-in for example itself master control borad 22.
As shown in Figure 1, it is to avoid the preparative fraction collector of sample loss also includes power autonomous module and/or external electrical
Source interface, described power autonomous module is rechargeable battery 16 or aneroid battery.Power autonomous module and/or external power source interface,
May be mounted on collection container rack 20, the effect of rechargeable battery 16 is that collection container rack 20 is at external power interface
In the case of not accessing external power supply, provide electric energy to collection container rack 20.When collection container rack 20 is positioned over fixing
When support 1 is internal, complete the charging action to rechargeable battery 16.When collection container rack 20 is taken from fraction collection by user
During device, rechargeable battery 16 still can retain the corresponding information of collection container rack 20 correspondence, such as user for a long time
The fraction information etc. that information, sample message, collection container are corresponding.The signal output part of described power autonomous module can be with
Control the master control borad in parts or collection container rack panel is connected, the state of display rechargeable battery.
In general, this fraction collector can carry out the operation of automatization by such step:
First, opening chromatograph of liquid, now chromatograph of liquid is in the non-fraction collection stage according to separation situation, controls
The liquid of multiple-way valve 4 now is flowed to be set as flowing out from water influent pipeline 3 to waste-solution line 5 by parts；
Then, when chromatograph of liquid occurs the fraction needing to collect, control parts according to pre-set flow velocity and
The stereometer of pipeline calculates the most required fraction and can arrive at collection liquid buffer 17；If desired, control parts will move
Movable arm-set 2 is arranged at collection container 9 top, carries out the preparation receiving fraction；
When the moment that fraction flow to collection liquid buffer 17 reaches, control parts and now the liquid of multiple-way valve 4 is flowed to
It is set as flowing out from water influent pipeline 3 to drain pipe road 28, controls the opening of parts maintained switch valve 7 simultaneously, make
Fraction is by entering into after collecting liquid buffer 17 in collection container 9；
The volume collecting container 9 can be pre-set in controlling parts, can count further according to pre-set flow velocity
Calculate and obtain filling the time needed for one bottle of collection container, when the corresponding time arrives, control parts and make switch valve 7 close,
And movement transfer arm assembly 2 moves and collects at container to the next one, period, fraction is temporary transient in collecting liquid buffer 17
Storage；When reaching next collection above container, control parts and make switch valve 7 open, be cached in collection liquid buffer
Fraction in 17 enters in this collection container, when controlling parts according to collecting the volume of container and pre-set flow velocity
When obtaining filling the time needed for this collection container, continue repeat the above steps, next one is collected container and carries out fraction
Collect；
Finally, after chromatograph of liquid detects that all fraction collections complete, control parts and the liquid of multiple-way valve 4 is flowed to
It is set as flowing out from water influent pipeline 3 to waste-solution line 5.
So far, a circulation is completed.
Particular embodiments described above, to present invention solves the technical problem that, technical scheme and beneficial effect entered
One step describes in detail, be it should be understood that the specific embodiment that the foregoing is only the present invention, is not limited to
The present invention, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, all should wrap
Within being contained in protection scope of the present invention.
Claims (7)
1. the preparative fraction collector avoiding sample loss, it is characterised in that it includes:
Fixed support (1)；
Transfer arm assembly (2), described transfer arm assembly (2) is connected on fixed support (1)；
Collection device, described collection device is arranged on transfer arm assembly (2), and described collection device includes that collecting liquid delays
Storage (17), water influent pipeline part and collecting part (8), the import of described water influent pipeline part is used for and separates
The liquid medium outlet of post is connected, and the outlet of described water influent pipeline part is connected with the import collecting liquid buffer (17)
Logical, the outlet of described collection liquid buffer (17) is connected with the import of collecting part (8), collecting portion
The outlet dividing (8) is interior to collecting container (9) for trickle medium, and described collecting part (8) also sets
It is equipped with switch valve (7)；
Controlling parts, the control output end of described control parts is connected with the control signal input of transfer arm assembly (2)
Connect, in order to manually or automatically control the action of transfer arm assembly (2), the control of described control parts by controlling parts
Outfan also control signal input with switch valve (7) is connected, in order to manually or automatically control by controlling parts
The action of switch valve (7)；
Described transfer arm assembly (2) has power source, the control output end of described control parts and the control of power source
Signal input part is connected, in order to by controlling component controls power source, thus control the action of transfer arm assembly (2)；
Also include collection container rack (20), described collection container rack (20) is provided with collection container chassis or has many
The collection container receptacle body of individual collection container jack (11), collects container chassis or collection container receptacle body is used for placing institute
State collection container (9)；
It is additionally provided with collection container identification device (14) on described collection container rack (20), and collects container identification dress
Put (14) and collection container (9) is corresponding, in order to collect container identification device (14) and be used for gathering collection container bottom
Collection container state information in dish or collection container jack (11), the control of described collection container identification device (14)
Outfan is connected with the signal input part controlling parts, in order to control parts according to the collection container state information received
Control the action of transfer arm assembly (2).
The preparative fraction collector avoiding sample loss the most according to claim 1, it is characterised in that: also wrap
Including waste-solution line (5), described water influent pipeline part has multiple-way valve (4), water influent pipeline (3) and drain pipe road (28),
The outlet of water influent pipeline (3) is connected with an import of multiple-way valve (4), the import of drain pipe road (28) and multiple-way valve
(4) a outlet is connected, and the import of waste-solution line (5) is connected with another outlet of multiple-way valve (4), goes out liquid
The outlet of pipeline (28) is connected with the import collecting liquid buffer (17), the control signal of described multiple-way valve (4)
Input is connected with the control output end controlling parts, in order to by controlling the action of component controls multiple-way valve (4).
The preparative fraction collector avoiding sample loss the most according to claim 1 and 2, it is characterised in that:
The exit of described water influent pipeline part is provided with shower nozzle (18).
The preparative fraction collector avoiding sample loss the most according to claim 1, it is characterised in that: described
Collection liquid buffer (17) on be provided with pressure compensation mouth (6).
The preparative fraction collector avoiding sample loss the most according to claim 1, it is characterised in that: described
Control parts there is master control borad (22) and collection container rack panel, described collection container rack panel is arranged on described
Collection container rack (20) on, and the transmission of this collection container rack panel and master control borad (22) two-way signaling is connected.
The preparative fraction collector avoiding sample loss the most according to claim 1, it is characterised in that: also wrap
Having included display module (12), described display module (12) is connected with controlling parts.
The preparative fraction collector avoiding sample loss the most according to claim 1, it is characterised in that: also wrap
Power autonomous module and/or external power source interface are included.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510335132.4A CN104897827B (en) | 2015-06-16 | 2015-06-16 | Avoid the preparative fraction collector of sample loss |
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| CN201510335132.4A CN104897827B (en) | 2015-06-16 | 2015-06-16 | Avoid the preparative fraction collector of sample loss |
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| CN104897827B true CN104897827B (en) | 2016-08-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB201601667D0 (en) * | 2016-01-29 | 2016-03-16 | Ge Healthcare Bio Sciences Ab | Improvements in and relating to liquid fraction collectors |
| CN110007038A (en) * | 2019-05-07 | 2019-07-12 | 安徽益必生物科技有限公司 | A kind of micro-example automatic classification collection device |
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| JP3318613B2 (en) * | 1993-11-16 | 2002-08-26 | 山善株式会社 | Nozzle position control method for fraction collector |
| US6309541B1 (en) * | 1999-10-29 | 2001-10-30 | Ontogen Corporation | Apparatus and method for multiple channel high throughput purification |
| US7138050B2 (en) * | 2003-05-29 | 2006-11-21 | Shimadzu Corporation | Fractionating/collecting device of liquid chromatograph |
| JP2005331436A (en) * | 2004-05-21 | 2005-12-02 | Yamazen Corp | Fraction collector |
| AU2005282363B2 (en) * | 2004-09-10 | 2010-09-23 | Gilson, Inc. | Fraction collector with adjustable tray |
| CN2938091Y (en) * | 2006-08-10 | 2007-08-22 | 北京丰杰华信科学仪器有限公司 | Automatic fraction collector |
| US20080183401A1 (en) * | 2007-01-29 | 2008-07-31 | Teledyne Isco, Inc. | Apparatuses and methods for wireless monitoring and control of enviromental sampling and chromatographic apparatuses |
| JP2010014559A (en) * | 2008-07-04 | 2010-01-21 | Shimadzu Corp | Preparative liquid chromatograph |
| US8775098B2 (en) * | 2008-08-19 | 2014-07-08 | Shimadzu Corporation | Preparative liquid chromatograph system |
| SG176578A1 (en) * | 2009-06-09 | 2012-01-30 | Ge Healthcare Bio Sciences Ab | Device for reducing loss of liquid during fraction collection |
| CN201548534U (en) * | 2009-12-08 | 2010-08-11 | 上海利穗化工科技有限公司 | Automatic fraction collector |
| CN103278590B (en) * | 2013-05-07 | 2014-10-15 | 大连依利特分析仪器有限公司 | Integrated automatic sampling fraction collector |
| CN204086228U (en) * | 2014-07-18 | 2015-01-07 | 江苏汉邦科技有限公司 | A kind of Novel liquid-phase chromatographic component gatherer |
| CN204679468U (en) * | 2015-06-16 | 2015-09-30 | 常州三泰科技有限公司 | Avoid the preparative fraction collector of sample loss |
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