Knowledge (XXG)

Air displacement pipette

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draws the liquid up into the tip. The instrument is then moved to the desired dispensing location. The plunger is again depressed to the first stop, and then to the second stop, or 'blowout', position. This action will fully evacuate the tip and dispense the liquid. In an adjustable pipette, the volume of liquid contained in the tip is variable; it can be changed via a dial or other mechanism, depending on the model. Some pipettes include a small window which displays the currently selected volume. The plastic pipette tips are designed for aqueous solutions, and are not recommended for use with organic solvents that may dissolve the plastics of the tips or even the pipettes.
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recommended for extremely low-volume pipette calibration, in the 2 microliter range, because the inherent uncertainties of the gravimetric method, performed with standard laboratory balances, becomes excessive. Properly calibrated microbalances, capable of reading in the range of micrograms (10 g) can also be used effectively for gravimetric analysis of low-volume micropipettes, but only if environmental conditions are under strict control. Six-place balances and environmental controls dramatically increase the cost of such calibrations.
660: 624:'s GMP/GLP regulations generally benefit from quarterly calibration, or every three months. Critical applications may require monthly service, while research and educational institutions may need only annual service. These are general guidelines and any decision on the appropriate calibration interval should be made carefully and include considerations of the pipette in question (some are more reliable than others), the conditions under which the pipette is used, and the operators who use it. 648: 291:. Depending on the size of the pipette, the user needs specific tip sizes like: 10 μL, 100 μL, 200 μL, 1,000 μL, other non-standard sizes, such as 5,000 μL (5 mL) or 10,000 μL (10 mL). The majority of tips have a color code for easy spotting like natural (colorless) for low volumes (0.1–10 μL), yellow (10–100 μL), or blue (100–1,000 μL). The corresponding pipette has the same 228: 30: 54: 259: 582: 628:
accurate indication of the volume dispensed. Relative humidity, ambient temperature, and barometric pressure are factors in the accuracy of the measurement, and are usually combined in a complex formula and computed as the Z-factor. This Z-factor is then used to modify the raw mass data output of the balance and provide an adjusted and more accurate measurement.
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are avoided. The lock mechanism is typically a mechanical toggle close to the pipette setting controls that interferes with the setting mechanism to prevent movement. Some pipettes, however, feature dials for setting the individual volume digits that can only be adjusted when unlocked by depressing and twisting the plunger.
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Some air displacement pipettes can additionally feature a locking mechanism (referred to as "locking pipettes") to allow better changing of volume yet preserving accuracy. By locking the set volume while performing several identical pipetting actions, accidental changes to the pipette volume setting
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displacement. A vacuum is generated by the vertical travel of a metallic or ceramic piston within an airtight sleeve. The upward movement of the piston, driven by the depression of the plunger, creates a vacuum in the space left vacant by the piston. To fill the vacuum, air from the tip rises, which
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Repeaters are specialized pipettes, optimized for repeated working steps like dispensing several times a specific volume like 20 μL from a single aspiration of a larger volume. In general, they have specific tips which do not fit on normal pipettes. Some electronic pipettes are able to perform this
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Schematic diagram of an air displacement pipette. The "Digital volume indicator" is a dial display that indicates the digits (i.e. unrelated to electronic). The components vary between brands and different volume sizes have different components, for example the piston in a P2 is needle-like and can
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With regard to the volume transferred, the smallest pipette that can handle the required volume should be selected. This is important because accuracy decreases when the set volume is close to the pipette's minimum capacity. For example, if 50 μl are dispensed using a 5,000 μl pipette, the results
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The plunger is depressed to both draw up and dispense the liquid. Normal operation consists of depressing the plunger button to the first stop while the pipette is held in the air. The tip is then submerged in the liquid to be transported and the plunger is released in a slow and even manner. This
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prevents liquid from coming into contact with the pipette itself. Instead, the liquid is drawn into and dispensed from a disposable pipette tip that is discarded after transferring fluid and a new pipette tip is used for the next transfer. Depressing the tip ejector button removes the tip, that is
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Calibration is generally accomplished through means of gravimetric analysis. This entails dispensing samples of distilled water into a receiving vessel perched atop a precision analytical balance. The density of water is a well-known constant, and thus the mass of the dispensed sample provides an
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The most common type of pipettes can be set to a certain volume within its operational range and are called adjustable. These pipettes commonly have a label with their volume range like "10–100 μL". These limits are indeed the limits as overwinding these limits would result in damage of the
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is used to measure the color difference before and after aspiration of the sample, providing a very accurate reading. This method is more expensive than the more common gravimetric method, given the cost of the colored reagents, and is recommended when optimal accuracy is required. It is also
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and volatile liquids tend to emit vapors which ascend into the pipette shaft even under proper operating conditions and may corrode the metal piston and springs, or the seals and o-rings that provide an air-tight seal between the piston and the surrounding
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In general, all tips are stored in 8 × 12 boxes for 96 pieces in an upright position. The spacing of tips in these boxes is usually standardised for multichannel pipette compatibility from a number of different suppliers.
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For optimal usage, every pipette supplier offers a broad range of different capacities. A small volume range of a pipette like 10–100 μL results in a much higher accuracy than a broad range from 0.1–1,000 μL per pipette.
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The accuracy required by the instrument. Applications requiring maximum accuracy also demand more frequent calibration. Instruments used for purely research applications or in educational settings generally require less frequent
45:, which are tools to handle volumes of liquid in the microliter scale. They are more commonly used in biology and biochemistry, and less commonly in chemistry; the equipment is susceptible to damage from many organic solvents. 78:
cast off without being handled by the operator and disposed of safely in an appropriate container. This also prevents contamination of or damage to the calibrated measurement mechanism by the substances being measured.
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Proper and careful handling. Pipettes that are frequently dropped, are subjected to careless handling or horseplay, or that are not properly stored in a vertical position, will tend to degrade in accuracy over
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Depending on the number of pistons in a pipette, there is a differentiation between single-channel pipettes and multi-channel pipettes. For manual high-throughput applications like filling up a 96-well
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most researchers prefer a multi-channel pipette. Instead of handling well by well, a row of 8 wells can be handled in parallel as this type of pipette has 8 pistons in parallel.
768: 542:. Whereas manual pipettes need a movement of the thumb (up to 3 cm), electronic pipettes have a main button. The programming of the pipette is generally done by a control 192:
Micropipettes can take a minimum volume of 0.2 μL and maximum volume of 10,000 μL (10 mL). They thus are used for smaller-scale transfers than equipment such as
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pipetting system. The fixed volume pipette cannot be changed. As there are less moving parts, the mechanism is less complex, resulting in more accurate volume measurement.
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Under average conditions, most pipettes can be calibrated semi-annually (every six months) and provide satisfactory performance. Institutions that are regulated by the
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To improve the ergonomics of pipettes by reducing the necessary force, electronic pipettes were developed. The manual movement of the piston is replaced by a small
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The skill and training of the operators. Skilled operators tend to operate the instrument more correctly and make fewer accuracy-robbing mistakes.
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Some manufacturers offer adjustable tip spacing pipettes. These allow to transfer multiple samples in parallel between different labware formats.
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be separated with ease from the piston assembly whereas in a P10ML it is drum-like and over 1 cm in diameter and is enclosed in plastic.
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The colorimetric method uses precise concentrations of colored water to affect the measurement and determine the volume dispensed. A
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is then replaced by the liquid that is drawn up into the tip and thus available for transport and dispensing elsewhere.
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and some further buttons. All settings are displayed on a small display. Electronic pipettes can decrease the risk of
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will be rather poor. Using a 300 μl pipette will give better results, whereas using a 50 μl pipette would be ideal.
1934: 1903: 1815: 2058: 1389: 1460: 547: 1063: 850: 1893: 1810: 1274: 513: 1496: 1244: 1213: 211:) enhanced the fixed-volume pipette, developing the pipette with a variable volume. Warren Gilson founded 1486: 1364: 1076: 539: 571: 212: 1782: 1442: 1284: 1470: 1279: 1194: 1131: 1997: 1980: 1919: 1820: 1744: 1680: 1675: 1593: 1414: 933: 2265: 2255: 2063: 2053: 1830: 1634: 1624: 1619: 1465: 1379: 1374: 1126: 632: 193: 74: 298:
For special applications, there are filter-tips available. These tips have a little piece of
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Adjustable tip spacing pipette transferring samples from a 384 well plate to a 96 well plate
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For sustained accuracy and consistent and repeatable operation, pipettes should be
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For the pipetting process there are two components necessary: The pipette and
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at periodic intervals. These intervals vary depending on several factors:
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Volume dials on EVOLVE manual pipette from INTEGRA Biosciences
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Three air-displacement pipettes that handle different volumes.
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Several different type of air displacement pipettes exist:
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University of Pittsburgh Environmental Health and Safety
239: 883:"Danger: You Might be Pipetting Yourself Out of a Job" 2248: 2198: 2152: 2108: 2077: 2021: 1973: 1912: 1872: 1849: 1793: 1737: 1694: 1643: 1612: 1549: 1518: 1495: 1479: 1453: 1319: 1253: 1165: 1090: 1012: 312: 196:, which come in 5, 10, 25 and 50 mL volumes. 975: 302:plastic in the upper conus to prevent sample 8: 1935:Nuclear magnetic resonance (NMR) instrument 2162: 2149: 2138: 1970: 1957: 1790: 1777: 1450: 1437: 1009: 998: 982: 968: 960: 721:"Volumetric Measurement in the Laboratory" 501:Single-channel and multi-channel pipettes 2300:Instruments used in medical laboratories 1816:Inductively coupled plasma (ICP) device 676: 643: 2329:Molecular biology laboratory equipment 1864:Transmission electron microscope (TEM) 934:"EVOLVE Well Balanced Manual Pipettes" 801:from the original on 26 December 2009 603:The liquid dispensed by the pipette. 106:Attachment point for a disposable tip 7: 851:"Ergonomic benefits of LTS pipettes" 737:from the original on 11 October 2016 489:Two major tip systems exist, called 831:from the original on 10 August 2022 774:from the original on 20 August 2016 665:Different volumes of micropipettes. 314:Commonly available pipette volumes 1859:Scanning electron microscope (SEM) 701:from the original on 4 August 2016 25: 856:. 28 January 2002. Archived from 1904:Thermogravimetric analyzer (TGA) 1714:Nuclear magnetic resonance (NMR) 944:from the original on 4 July 2017 658: 646: 580: 226: 522:Adjustable tip spacing pipettes 477: 401: 382: 205:University of Wisconsin–Madison 203:In 1972, several people of the 653:Oxford Single-Channel Pipettes 559:function using standard tips. 458: 420: 344: 1: 622:Food and Drug Administration 439: 86:Main parts of a micropipette 758:"How to Use a Micropipette" 363: 306:contaminating the pipette. 2350: 295:, printed on the pipette. 207:(mainly Warren Gilson and 188:Adjustable or fixed volume 62:These pipettes operate by 2297: 2165: 2148: 2137: 2059:Time-domain reflectometer 1969: 1956: 1826:Liquid chromatograph (LC) 1789: 1776: 1449: 1436: 1008: 997: 793:Zinnen, Tom (June 2004). 327: 215:based on this invention. 39:air displacement pipettes 795:"The Micropipette Story" 100:Digital volume indicator 1894:Melting-point apparatus 1275:Cryogenic storage dewar 909:"Ergonomics: Pipetting" 2334:Volumetric instruments 2324:Microbiology equipment 1831:Mass spectrometer (MS) 1821:Gas chromatograph (GC) 685:"Use of Micropipettes" 576: 518: 263: 150:adjustable tip spacing 97:Volume adjustment dial 59: 34: 33:Micropipette in action 2206:Acid-resistant gloves 1887:differential scanning 574: 516: 261: 56: 32: 2319:Laboratory equipment 1783:Analytical chemistry 1285:Laminar flow cabinet 991:Laboratory equipment 2155:Personal protective 1064:Meker–Fisher burner 938:INTEGRA Biosciences 863:on 30 November 2010 827:. 18 January 2018. 825:INTEGRA Biosciences 530:Electronic pipettes 315: 283:tips. The tips are 18:Electronic pipettes 1998:Function generator 1981:Bench power supply 1920:Analytical balance 1681:Ostwald viscometer 1676:Graduated cylinder 1415:Inoculation needle 940:. 4 October 2016. 889:. 23 November 2011 577: 519: 313: 264: 238:. You can help by 194:graduated pipettes 94:Tip ejector button 60: 35: 2306: 2305: 2293: 2292: 2289: 2288: 2266:Fire extinguisher 2256:Biosafety cabinet 2244: 2243: 2133: 2132: 2129: 2128: 2064:Transistor tester 2054:Spectrum analyzer 1952: 1951: 1948: 1947: 1772: 1771: 1768: 1767: 1644:Measuring devices 1466:Soxhlet extractor 1432: 1431: 1428: 1427: 1380:Spectrophotometer 1375:Pipeclay triangle 1127:Mortar and pestle 640:Additional images 633:spectrophotometer 563:Locking mechanism 487: 486: 325:Max. volume (μL) 322:Min. volume (μL) 256: 255: 75:Sterile technique 16:(Redirected from 2341: 2163: 2150: 2139: 2044:Network analyzer 1971: 1958: 1791: 1778: 1451: 1438: 1420:Inoculation loop 1290:Microtiter plate 1230:Test tube holder 1122:Magnetic stirrer 1010: 999: 984: 977: 970: 961: 954: 953: 951: 949: 930: 924: 923: 921: 919: 905: 899: 898: 896: 894: 879: 873: 872: 870: 868: 862: 855: 847: 841: 840: 838: 836: 817: 811: 810: 808: 806: 790: 784: 783: 781: 779: 773: 762: 753: 747: 746: 744: 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509: 500: 498: 496: 492: 482: 479: 474: 471: 468: 467: 463: 460: 455: 452: 449: 448: 444: 441: 436: 433: 430: 429: 425: 422: 417: 414: 411: 410: 406: 403: 398: 395: 392: 391: 387: 384: 379: 376: 373: 372: 368: 365: 360: 357: 354: 353: 349: 346: 341: 338: 335: 334: 330: 324: 321: 318: 317: 311: 307: 305: 301: 296: 294: 290: 289:Polypropylene 286: 282: 274: 272: 268: 260: 250: 247:December 2009 241: 237: 234:This section 232: 229: 225: 224: 218: 216: 214: 210: 206: 201: 197: 195: 187: 183: 180: 178: 174: 171: 169: 165: 162: 160: 156: 153: 151: 148: 146: 142: 141:multi-channel 138: 135: 132: 129: 127: 123: 120: 119: 118: 112: 110: 105: 102: 99: 96: 93: 90: 89: 85: 83: 79: 76: 72: 69: 65: 55: 48: 46: 44: 40: 31: 27: 19: 2261:Fire blanket 2199:Eye and hand 2185:Rubber apron 2049:Oscilloscope 2013:Potentiostat 1940:Plate reader 1836:pH indicator 1806:CHN analyzer 1801:AutoAnalyzer 1594:Round-bottom 1487:Boston round 1350:Filter paper 1305:Refrigerator 1222:Retort stand 1190:Clamp holder 1186:Beaker clamp 1152:Vortex mixer 1147:Stirring rod 1142:Static mixer 1072:Teclu burner 946:. 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Index

Electronic pipettes

micropipette

piston
air
Sterile technique
graduated pipettes
University of Wisconsin–Madison
Henry Lardy
Gilson Inc.

adding to it

disposable
plastic
Polypropylene
color code
foam
aerosols
microtiter plate
Adjustable tip spacing pipette transferring samples from a 384 well plate to a 96 well plate
electric motor
battery
wheel
RSI
Volume dials on EVOLVE manual pipette from INTEGRA Biosciences

calibrated
Corrosive

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